Introduction to the ansys meshing application chapter 2

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ق ‎at aa ACR MCR en‏ يكنا Overview ° Teteoduotivg to the BOGCYS Oeshiay Ppphoatiocn * Deshiog Requreweuts Por DiPPerecd Physics *®OC6YG Desking Oorbhiow * Deshiag Dethods Por OO unl CO yeowetries ° Dorkshop ©. = @uiowair Deshiey Por a Dulibody Port سكل لس ‎Progra‏ = ~ DrowPerricy Desk to OPX vr PLOEOT 

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* Parawetric: Paraveters drive systew ° Perssted: Oodel updates pussed through systew ° ihb-niowdted: Buselce sivutaivg w/ieited ‏اوه‎ ° Pexble: @ble to ocd couirels to oPluedre resultcn week (copes void over wodel/sicmutatizst) * Physics woe: (Key of P physics to auto wate wodeliog ood siwvuloive throughout systew * Odaptve ochtecture: Opes systew thot coo be adapted to a ‏و و وی‎ - 0060 ‏راسه‎ weskiey ceuird, sober aeuirdl, eto. 

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مي ني كلكا سس tte “BOCYG Deshiay @ppicaiod’? *COGYG kes bers workiog to iteqrate “best in class” teckooloyes Prow severd sources: - 1ICEO CFO - ۳٩ - - 000 - BOCYE Prep/Post - Ee. 

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ق ‎at aa ACR MCR en‏ يكنا هام سا هراک ۰۲۳ ‏مره‎ oP the PBOGYG Oeshic @ppticaiva ta Dorkbeuck ts to provide ‏موه نم وت‎ )90026 ۷۲۵ Tap. weshiey tools io siete ‏,مسا‎ Por use by cap ocdsis ype! -PEO Gieuktioas * Orvkauicd Ovcavics Gicmukaios ۰ ‏م6 م0 توق‎ - 0۷۵ - 006۷۵ ‏را‎ 0۷۵ ۰ ‏ما60 مسق‎ 600۳0 ‏م6‎ ‎* )۵0067)۵ 00< * BOGYE PLOEOT 

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= Por bobs OPO (Pid) ord PEO (soil) cordelhary, ‏و ای ب‎ the DP tio ‏فاه‎ rome oP decree bpcatces wits the door. ص سوسوي مه و و ماه بط مور و و ماو ‎Dke purpose of‏ = ‎res.‏ وه وه ۵ ما اه ریم ~ Whe basic buldioe-blorks Por a OO west oe! ‎(Pyrenees (whore (Pres (Porwed whos 9‏ سا بت با ‎cand hex. cobs owt)‏ سم شمه ‎ ‎ 

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ماي ممص امو تیور - ميت وار مسو مرج مول ير بلسي حب ‎eevessory detal‏ عماس - ‎the‏ و افو ار ‎he‏ و لو * RePicewedt = Dkere in he ‏مق‎ ore the went ‏الم واه رو‎ ۳ ‏و‎ wal ‏تقو‎ higher devrstes oP | 

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- ‏موه وه سوه سوام و‎ resource (sewn | provessknt ike). (odour the Pideliy oF ‏چات مه بط‎ avalible resvurces. 

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۰ ‏اه‎ ‎fev ore oP high gerne copia) wevk ewes com becown: ‏,لجخحاصا‎ Poor eyratyy elect baa rad tp poor qudiy renter, ki poe oes, ‏له طایح مه‎ *). Por wuneoy. Ohawceoy & a wemury of the rekitve here one a axeober of cwethods Por wewrurtay wesk elect qualty (wevk wet: eople, coe keportcal wets ty the elecweat ‏لمویت تما نف نیفرط‎ fo hed shops nl bordel Pranv © (meebo) b ( (Ocrarveynble), 

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ق ‎at aa ACR MCR en‏ يكنا نس مت تست , showieey dPRereae between «pod ocd poor weskes: (Dhic example therars oa vecoveryed korea Prk! ia wand sok castey. Ou cbse Reepecara tts plear thot far eration tr usble i recoke o secble data Pie i fe reer oP poor ‏اه نشعي‎ (Phe excxople wks pod qucky ebcoras dewousiraes wo problers tthe soko Pe COEVE Desk Bprlestos proves cry bok help woaaknise work quay 

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- 6 ‏سجن وی و و‎ oF rovers * C.y, ewpercurr, siroa easy, seve ror, ‏ورهار‎ ot الاك رام مها او ‎Set coer‏ ‎preferred‏ - ‏موی‎ expe PEO sobers require a hex comes - tet weskes Por PCO ore warily second rector (ark ‏له ماوت‎ rst beers ی 

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‎٠١ 060‏ موه هن ‎ty capture‏ و 6 - ‎pir.‏ روا رح ,و6 وق ۰ اجه ۵ لصو ‎Desk quay oad sworkuess‏ = ‎results ‏ات مان زاسون مسا نا مسا سا‎ oP rhe = tet ‏واه بط نج موم وم‎ sill prePerred: ‏ون با‎ ۲ OPO ore wernily Pirst order (oo ‎ ‏ما ما مت لاو ‎ ‎ ‎ ‎ ‎ 

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‎Ae aad ۵‏ هر وت وا ‎0 ‎OLE ‎AEE ‎ 

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ق ‎at aa ACR MCR en‏ يكنا QOesk Types * Wex Orsk 

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* Vet Desk () Coa be yeceraed quickly, ‏اه ,رای‎ Por ‏ممصم او‎ Qesk von be ‏لس‎ 0 © steps: Grp (: OePice eleweut siztery Grp ©: Ceurrae Desk Ray y, oes 

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ق ‎at aa ACR MCR en‏ يكنا QOesk Types ۰ Vet Desk ©) lovee ۲ = ror ‏یی وروی با‎ give ‏مسيم‎ ‎ied here ‏متس‎ - cel counts ree rapids PerPorated phi res licny ft pressure drop nox ‏مش‎ 

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۰ Vet Desk 9) TePlaiog hver helps wil rePuewedt wed ip the wal, bu stl eviropir i O-D ‏مها‎ week) 

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لوو() وبا" ۰ - Pewer eleweds required ‏اوه ۳ ماو سا و‎ 0 ‏و‎ ‏ای ای مسا‎ provides the sore reschaca of Plow physizs, has LEGG tho bd the seo oF andes os he tetresh) PET J WEX ١ 

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0 و ۳ ور ماو و9 لو وا نو او تطلم) موم ی لب لصف سا موی وله مس * ‎lovers, oreur of tight curvature the uviey lerdiag ced trultag edger)‏ 

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ق ‎at aa ACR MCR en‏ يكنا Desk Types ۰ Wex Desk = Cor arbiray yerweiies, hex weshioy way require a wadhstep provers whic on vied a highs qudlivihigh eFPieusy eck = or ‏اوه ام متسه و و بو‎ ‏رون‎ tb gpuerate hex weshes Curry Oude Love 

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ق ‎at aa ACR MCR en‏ يكنا ‎aaa‏ ل وش بای ‎ ‎° Tre BOGYGS Oeshiay Oppicaivg uses a ‘divide & cooquer’ ‏كاعد ون‎ ‎*@ dPPerect ‘Oeshioy Oethod’ cod be ‏اوه‎ to euch pot ‎io the yeowriry ‎- Orshes betwees bodes i dPPerea ‏عه او با رت عون‎ samen Bors ‎~ Oatcked ‏دومص دمص عرص‎ weskes wil be yecrrated Por bodies ia vive port * Ol weskes ore ‏حول ای موه و وا تاموتا طلست‎ ۰) ‏و حلاص نال اه میم‎ watuble Por OO ued 90 ‏موی‎ 

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‎six dPPeredt weshioy wethods ic the BOGYG Oeshicgy‏ و م۰ ‎Opphcatics Por OO Beowetry:‏ ‎- ‏رس‎ ‎- Petrdkedevas ‎* Pack OoPorenicny ‎+ Patch Tedepeudeot ‎= (ICBO CPO Peirs ckorihw) ‏بو ببس - عسال0 - ۳ +اد2 00 - ‎ ‎ 

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ق ‎at aa ACR MCR en‏ يكنا QDeshkteary Detwds Por OO Geowery ° Dhere ore Pour dPPeredt weshioy wetods ia the BOGYS QDeskiay PhaiPorn Por CO Geowetry whick cos be upplied tz GuPuce Bodes or Ghells: ~ @utocraie Deo (Querttersl Orci) - 01 Priefer - Door Quen! ~ OaPore Gud 

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۰ Vetrckedoos Orkod wik Puck OodPoretay @kprika © Penen uve! ‏تماق‎ (ecko wend verter) are ‏اسر‎ ‎—Aecknes the (Bxparmiva (Pasir sete, whick ooairoks the tera orm rote of ‏ول‎ wih respent to brvrmckwry size — Tock ides toPktra mr bovrckwry kaver reskin Por OPO - 0۱ {ui Gweep ‏یی اوه - سم و و و لا و لاس‎ wil be ‏همم‎ 202 جات سانا ‎Pree / 1‏ مسيم 27 1 Owe Dok — 

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ق ‎at aa ACR MCR en‏ يكنا Mais a aca ce i Na acai * Deirdedow Ortod wik Puck ‏نموه‎ )10060 OPO Tora) 9! ~ ‏لت و۳‎ herr bovenkrtes (eckeo wad verter) are ot weoroory respecte uke here bo load, bowery ovadioa, or vier obpel svyped ty thew اه له رای مت و سب مس وهای سم ‎Dee Por‏ - ۱ ۱ سارت هلان سوه سس موی ‎Deira party‏ م6۵ مسبت ‎DP‏ جر 2 2 27 سرام نات سرك لساري 

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ق ‎at aa ACR MCR en‏ يكنا Guweep Oetod © ‏مور‎ Weres xnllor Pris ١ ‏م 6 عام يي‎ deur + ody net be Oweepdbe ere 2 #7 * Grete ‏ع) ,یوت‎ Target ° AePtation oo vied pure hex pr prises وا سا جوا و ‎S Blows‏ ‎Por OF‏ (معاسر 

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0ك تست تب دیتاسا ۱ * Dorks of body tevel wis vier ‏جلاسی‎ ‎° Ouliple elewects took thickaess possible Por siete body ports 7۳۳۳ ‏ب‎ ‎SSS 02 

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۰ ‏مسا ها باه تب‎ Detrakedrad (Pack OodPorsicr)) ‏مسق لو‎ Deshi, depeadag upoa whether the body ts sweepable. odes ithe save pot wal ‏اوه سم‎ est. 

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۰ aPhioa is accowpshed by exinnday Bases ‏ام‎ too bourkry i korea the ‏و روما‎ reschtion, ‏و‎ Por OPO * Geoootk Procsiica Proce icPhted layer to toterior west * ‏:موه ممطاون‎ - ‏هه‎ ‎- ‏موه جوا‎ * Preview TcPhatioa * Pre us. ‏موه بو‎ * Ol wetkods coc be icPhited except Por Wex-Oowiccat ond Tic Gurr * Gweeping: — Pure hex or werk A, et 4 و 

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ب د ا ااا * Mew ‏و‎ Por dO. * ‏موس موی و‎ - )( the ‏,لاه نو‎ this port wuld ave to be Ok Dull Loor, tt car shred into D bodies to yet a pure hex west IP rn, SER ‏ی‎ 0 ی و ی 

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ق ‎at aa ACR MCR en‏ يكنا ‘Wex-Onwit Oetod * De hex-dowiouat weehieg okprihe ‏یه مین مه‎ wesk First, the ‏هه له لو موم امه‎ ore Piled tas ceeded. ] a hen cael ty desired Por a body teat vera be swept ~ Doel Por bodes wa kare remus oP terior ‏اس‎ ‎> Oot wePdl Por hit ooeophoated bodes where the rato oP voknee to uPace area ty bus ~ Ov boverkory keer repvhaios Por OPO. * Dara wed Por POO aedyos eh 2 So 0 ‏لا‎ 

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ب د ا COXDesk Ortod 'عومطا ه ‎OPX-Desk wes‏ . روص - Oe Orvktey ‏مهار(‎ pitzkees ary ‏امرس‎ or wexePerred ty OX-Devk ~ Gelert Reh Dower ‘Ouk...) os the Debord kanehen the OPX-eok oon. - Povoible Creerae Desk! pad OOX-Deok wetud ‏ای با ره ماس‎ + Deer rest oF ‏مطل‎ 

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ب د ا كا * Dis workshop wil thistrote the use oF the ucczaic Deshi Detod Por a siete body pot ۰ Dhe troasPer of the wesk to PLOECOT aad CPX ts dev dewoostroted 3 Se 

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ق ‎at aa ACR MCR en‏ يكنا تس تا (. Copy the phere: Ple Proc the ‏لا ابو‎ Poker to pour ‏تمصع بجاوب‎ 9 ‏مج‎ Dorkbeark ond double cick the Desk retry ta the Onwprcent ‏اد اس مسج‎ 9. Rkhtolck oa Beowety i he Deck ect ‏اه له ماوت مت با‎ “beoport ‏تسس‎ 01: wy he pian Pe you copied ord chick ‏مر‎ 9.0 pe that ke Beowety ei he Pree ‏ماو‎ ww hos ‏و‎ greed chook wah ‏مور‎ hot youre) has beeu spec Pied 

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ق ‎at aa ACR MCR en‏ يكنا تا( هجو و ‎he Desk eury‏ مار :3 ‎the‏ هر ‎(Bk.‏ سا اج اما و معا ی 00 Ae he Deskin Optoas pac sot te Physios OrePerrwe © OPO, te Desk Debord ‏ره و‎ wand press OK O.. Right cick oa Desk ood setert Georrate Desk ۵ 2 9.038 the view wworipukaticg tovks ocd the axis ited to kK reper the weshk ‏ای‎ 8 58۱ 8 2 ۵ 6 8 ‏توي عد يف بحيو‎ (OD), fe Drskan, Dpphtim heer proskemd ‏ای و‎ ‎coenk‏ ف ا ا اك ل لاسي سامت فك للم لسن ‎coef pene fa rch. Gone Parke‏ ‎ ‎ 

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ب د ا Onved Greviow 2 rrson soos on sass Enter a name for the selecton group: fitocyines? هت رع 6 08 2- .00( .)8 ‏لحم جص ة]) دا عجطة1) مصتدجاج 8) جد بد‎ ‏سوه سود‎ oP the pipe rod Paces os shown. Rightolck to the Oodet Oiew saad chopse Orede Dowed Getevtion. (Boter velocity Por the Getericr One (0. Repeat Por the vier tuve pipe eed Paces ustay the ocertay a shout (0.Vke Oued Gelevious just oreued: cove tsted to the Outtor ‏مسوك برط‎ Ocnved Getevtioas. ۷ sassiqued here ull be trocsPerred tr the: CO solver sv the appropriate Pou ‏وین‎ cot be opphed oo these surbues. 

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ب د ا م1۳ (9.Getert Desk to the Outta ‏ماه لوج لد‎ ۰ etch OP Get Ose Buowatc Det IoAaicg to Progra 4 ] ‏ا ای چاه سم رلاسمو)‎ 16:۳۰ ‏سامت لعجب ایو( مه اه‎ Becercie Devk. Doe ‏روا ولا با‎ ore rma Brow ‏ام ولا له‎ ‏مت لت و لسوت‎ Phe hickares of the ‏تهج مخ هه للطله جا همطل‎ ‏تسه رقظ لاب اج اس‎ جوا نز سس 

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ب د ا لك OP er te Seven (Pho foes hee creed fae rm hrm curmor tol uo be crate Unb hen he suet ol gy oe tar Gece Cle ery (Chetan ey one oe Phe ead tbe eck cu rack orks repens. Clee te oo oa oe ‏عسات سساح م‎ ho موی تاه ‎te ponte Prd, ork‏ ما ‎Ba‏ 19:0 he sedel by ohokisny ox te 7 canis trad (+X Direvtrma) 8 12 ‏اط0‎ oa he Dew Gevioa Phe @rae tov ta the wus bor, LePt ook, kokd wad drag he cursor ۰ he deevioa oP fe orew wr thetrted i oreue the evi Poe (0.Crected Gevira Plas are toted ss (botow bP). Phares cou be edu cctvoted vei he checkbox, debed 01 betwee OO eked vw xd OO shoe Yew. ‘Dry hie wow (you ual weed i rokte be wokl i ser be 

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ق ‎at aa ACR MCR en‏ يكنا Cyc (O.1P pou expand the Gritsios ‏ی رو‎ توت مت بو ‎of‏ امه سا سود له ‎Weck,‏ 2 مس سس و اه لبا ‎wks‏ ‏مس چا اه وه( ‎Deck‏ »600 وی لو () میا ‎uci‏ 13 ات +6 ماسوله ساي صا عم ‎View Advances‏ + advanced 2 Pine Notes ‏ور‎ or 0 

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ق ‎at aa ACR MCR en‏ يكنا هت مات م۷ نهر رای ما ان بط 9۳) .0101 مه ‎tty a ew OPO‏ سم 696 15 ‏صو‎ sous Dorkbeock Diedew, right ook ost ke Desk ‏روش‎ is he Orohien hoki? you rented oc ke Project Gokecretc od observe 3 thot pou oa irtosPer the wesk ty a ceuy 5 ۵0 ‏د02 )له 0 و‎ Vo Dew >). Gelert ether PLOCOP or CPX 99: thot he Deok ‏مس نوت بط‎ pdt : = sirvbel, rich tok he Deok eciry oxi selon 2 @ comin Opckie. Dis ul pass dots he cer ۲0۵0/۵۵ ‏.جصصدص‎ 9 امه > مطادة مه امم alae 

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يمك heat wi Oorkbeuk Dest OP AP PLOECOT was -Onbe fence | ok ‏لوا رو ما بط‎ 3 Gta 2, sand covert the defo 2 pte the ۱ ‏جرا‎ ‎۱ ‎wth the ‏اما ات‎ ۱ ‏لاه( سا مس‎ Pe Dew 

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ق ‎at aa ACR MCR en‏ يكنا ری و رت اق O° AP CPX was setevted - Double hick the Getup ‏,تا‎ ‎OX Pre will krack ths the crest looded 00 Cae he proevt Proc the Dorkbeocds: Pte Oro 

Chapter 2 Introduction to the ANSYS Meshing Application ANSYS Meshing Application Introduction ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-1 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Overview Training Manual • Introduction to the ANSYS Meshing Application • Meshing Requirements for Different Physics • ANSYS Meshing Workflow • Meshing Methods for 3D and 2D geometries • Workshop 2.1 – Automatic Meshing for a Multibody Part – Program Controlled Inflation – Transferring Mesh to CFX or FLUENT ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-2 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Workbench Guiding Principles Training Manual • Parametric: Parameters drive system • Persistent: Model updates passed through system • Highly-automated: Baseline simulation w/limited input • Flexible: Able to add controls to influence resulting mesh (complete control over model/simulation) • Physics aware: Key off physics to automate modeling and simulation throughout system • Adaptive architecture: Open system that can be adapted to a customer’s process – CAD neutral, meshing neutral, solver neutral, etc. ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-3 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application What is the “ANSYS Meshing Application”? Training Manual • ANSYS has been working to integrate “best in class” technologies from several sources: – – – – – – ICEM CFD TGrid GAMBIT CFX ANSYS Prep/Post Etc. ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-4 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application ANSYS Meshing Application Overview Training Manual • The objective of the ANSYS Meshing Application in Workbench is to provide access to common ANSYS Inc. meshing tools in a single location, for use by any analysis type: – FEA Simulations • Mechanical Dynamics Simulation • Explicit Dynamics Simulation – AUTODYN – ANSYS LS DYNA • Electromagnetic Simulation – CFD Simulation • ANSYS CFX • ANSYS FLUENT ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-5 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Specification Training Manual Purpose – For both CFD (fluid) and FEA (solid) modelling, the software performs the computations at a range of discrete locations within the domain. – The purpose of meshing is to decompose the solution domain into an appropriate number of locations for an accurate result. – The basic building-blocks for a 3D mesh are: Tetrahedrons (unstructured) Hexahedrons (usually structured) Pyramids (where tet. and hex. cells meet) Prisms (formed when a tet mesh is extruded) Manifold Example: Outer casting and internal flow region are meshed for coupled thermal/stress gas flow simulation ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-6 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Specification Training Manual Considerations • Detail: – How much geometric detail is relevant to the simulation physics. – Including unnecessary detail can greatly increase the effort required for the simulation. Is it necessary to resolve this recess? • Refinement – Where in the domain are the most complex stress/flow gradients? These areas will require higher densities of mesh elements. Refined mesh around bolt-hole ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-7 Extra mesh applied across fluid boundary layer April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Specification Training Manual • Efficiency – Greater numbers of elements require more compute resource (memory / processing time). Balance the fidelity of the simulation with available resources. ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-8 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Specification Training Manual • Quality – In areas of high geometric complexity mesh elements can become distorted. Poor quality elements can lead to poor quality results or, in some cases, no results at all! – There are a number of methods for measuring mesh element quality (mesh metrics*). For example, one important metric is the element ‘Skewness’. Skewness is a measure of the relative distortion of an element compared to its ideal shape and is scaled from 0 (Excellent) to 1 (Unacceptable). *Further information on mesh metrics is available in the documentation and training lecture appendices ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-9 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Specification Training Manual Example showing difference between good and poor meshes: This example illustrates an unconverged thermal field in a manifold solid casting. On closer inspection it is clear that the simulation is unable to resolve a sensible data field in the region of poor quality elements. The example with good quality elements demonstrates no problems in the solution field. The ANSYS Meshing Application provides many tools to help maximise mesh quality ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-10 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application FEA Meshing Issues Training Manual • Structural FEA – Refine mesh to capture gradients of concern • E.g. temperature, strain energy, stress energy, displacement, etc. – tet mesh dominated, but hex elements still preferred – some explicit FEA solvers require a hex mesh – tet meshes for FEA are usually second order (include mid-side nodes on element edges) ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-11 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application CFD Meshing Issues Training Manual • CFD – Refine mesh to capture gradients of concern • E.g. Velocity, pressure, temperature, etc. – Mesh quality and smoothness critical for accurate results • This leads to larger mesh sizes, often millions of elements – tet mesh dominated, but hex elements still preferred – tet meshes for CFD are usually first order (no mid-side nodes on element edges) ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-12 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Types Training Manual • Tet Mesh and Tet/Prism hybrid ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-13 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Types Training Manual • Hex Mesh ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-14 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Types Training Manual • Tet Mesh 1) Can be generated quickly, automatically, and for complicated geometry Mesh can be generated in 2 steps: Step 1: Define element sizing Step 2: Generate Mesh ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-15 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Types Training Manual • Tet Mesh 2) Isotropic refinement – in order to capture gradients in one direction, mesh is refined in all three directions – cell counts rise rapidly Perforated plate resulting in pressure drop in x direction x ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-16 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Types Training Manual • Tet Mesh 3) Inflation layer helps with refinement normal to the wall, but still isotropic in 2-D (surface mesh) ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-17 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Types Training Manual • Hex Mesh – Fewer elements required to resolve physics for most CFD applications • This hexahedral mesh, which provides the same resolution of flow physics, has LESS than half the amount of nodes as the tet-mesh) TET ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights HEX 2-18 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Types Training Manual • Hex Mesh – Fewer elements required to resolve physics for most CFD applications. • Anisotropic elements can be aligned with anisotropic physics (boundary layers, areas of tight curvature like wing leading and trailing edges) ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-19 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Types • Training Manual Hex Mesh – For arbitrary geometries, hex meshing may require a multi-step process which can yield a high quality/high efficiency mesh For many simpler geometries, sweep techniques can be a simpler way to generate hex meshes – • • ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights Sweep MultiZone 2-20 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application ANSYS Meshing Application Workflow Training Manual • The ANSYS Meshing Application uses a ‘divide & conquer’ approach • A different ‘Meshing Method’ can be applied to each part in the geometry – Meshes between bodies in different parts will be non-matching or non-conformal – Matched or conformal meshes will be generated for bodies in a single part • All meshes are written back to a common central database • A number of different methods are available for 3D and 2D geometry ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-21 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Meshing Methods for 3D Geometry Training Manual • There are six different meshing methods in the ANSYS Meshing Application for 3D Geometry: – Automatic – Tetrahedrons • Patch Conforming • Patch Independent – (ICEM CFD Tetra algorithm) – – – – Swept Meshing MultiZone Hex Dominant CFX-Mesh ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-22 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Meshing Methods for 2D Geometry Training Manual • There are four different meshing methods in the ANSYS Meshing Platform for 2D Geometry which can be applied to Surface Bodies or Shells: – Automatic Method (Quadrilateral Dominant) – All Triangles – Uniform Quad/Tri – Uniform Quad ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-23 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Patch Conforming Tetrahedrons Training Manual • Tetrahedrons Method with Patch Conforming Algorithm – Faces and their boundaries (edges and vertices) are respected – Includes the Expansion Factor setting, which controls the internal growth rate of tetrahedrons with respect to boundary size – Includes inflation or boundary layer resolution for CFD – Can be mixed with Sweep methods for bodies in a single part – conformal meshes will be generated Element Shapes Tetrahedral Mesh Prism Pyramid Tet ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights Swept Mesh 2-24 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Patch Independent Tetrahedrons Training Manual • Tetrahedrons Method with Patch Independent (ICEM CFD Tetra) Algorithm – Faces and their boundaries (edges and vertices) are not necessarily respected unless there is a load, boundary condition, or other object scoped to them – Useful for gross defeaturing or to produce a more uniformly sized mesh – Simplified version of Tetra tightly integrated into the ANSYS Meshing Application – Honors standard ANSYS Meshing Application mesh sizing controls – Tetra parts can also have inflation applied Coarse mesh ‘walks over’ detail in surface model Element Shapes Pyramid Prism Tet ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights Inflation layer applied for CFD 2-25 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Sweep Method • Produces Hexes and/or Prisms • Body must be Sweepable • Single Source, Single Target • Inflation can yield pure hex or prisms Training Manual Body split into 2 parts to allow for swept meshing Extrusion removed to allow for swept meshing Element Shapes Prism Allows for inflation layer (boundary layer resolution) for CFD Hex ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-26 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Thin Solid Sweep Meshing Training Manual • Multiple source/target faces • Works at body level with other methods • Multiple elements through thickness possible for single body parts ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-27 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Automatic Method Training Manual • The Automatic setting toggles between Tetrahedral (Patch Conforming) and Swept Meshing, depending upon whether the body is sweepable. Bodies in the same part will have a conformal mesh. Swept Tetrahedron (Patch Conforming) Tetrahedron (Patch Conforming) Programmed Controlled Inflation No inflation ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-28 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Inflation Training Manual • Inflation is accomplished by extruding faces normal to a boundary to increase the boundary mesh resolution, typically for CFD • Smooth Transition from inflated layer to interior mesh • Collision avoidance: – Stair-stepping – Layer compression • Preview Inflation • Pre vs. Post inflation • All methods can be inflated except for Hex-Dominant and Thin Sweep • Sweeping: – Pure hex or wedge ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-29 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application MultiZone Sweep Meshing Training Manual • New feature for 12.0 • Automatic geometry decomposition – With the swept method, this part would have to be sliced into 3 bodies to get a pure hex mesh ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-30 With MultiZone, it can be meshed directly! April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Hex-Dominant Method Training Manual • The hex-dominant meshing algorithm creates a quad-dominant surface mesh first, then hexahedral, pyramid and tetrahedral elements are filled in as needed. – – – – Recommended when a hex mesh is desired for a body that cannot be swept Useful for bodies with large amounts of interior volume Not useful for thin complicated bodies where the ratio of volume to surface area is low No boundary layer resolution for CFD • Mainly used for FEA analysis Element Shapes Pyramid Tet Prism Hex-dominant mesh shown above: 19,615 Hex (60%) 5,108 Tet (16%) 211 Prisms (1%) 7,671 pyramids (24%) Hex ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-31 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application CFX-Mesh Method • Training Manual CFX-Mesh uses a ‘loose’ integration. – No Meshing Application sizings are respected or transferred to CFX-Mesh Selecting Right Mouse ‘Edit…’ on the Method launches the CFX-Mesh GUI. – – Define mesh settings/controls/ inflation Preview & generate volume mesh Commit the current mesh model Return to ANSYS Meshing – – – – Generate Volume Mesh Possible to ‘Generate Mesh’ on a CFX-Mesh method without opening the application • Uses current or default settings ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights Inflation layer 2-32 April 28, 2009 Inventory #002645 Workshop 2.1 Pipe Tee Mesh ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-33 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Goals Training Manual • This workshop will illustrate the use of the Automatic Meshing Method for a single body part • The transfer of the mesh to FLUENT and CFX is also demonstrated ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-34 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Specifying Geometry Training Manual 1. Copy the pt.agdb file from the tutorial files folder to your working directory 2.Start Workbench and double-click the Mesh entry in the Component Systems panel in the Toolbox 3.Right-click on Geometry in the Mesh entry in the Project Schematic and select Import Geometry/Browse 4.Browse to the pt.agdb file you copied and click Open 5.Note that the Geometry entry in the Project Schematic now has a green check mark indicating that geometry has been specified ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-35 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Initial Mesh Training Manual 6.Double-click the Mesh entry in the schematic or right-click and select Edit. This will open the Meshing Application 7.In the Meshing Options panel set the Physics Preference to CFD, the Mesh Method to Automatic and press OK 8.Right click on Mesh and select Generate Mesh 9.Use the view manipulation tools and the axis triad to inspect the mesh Based upon choice of physics (CFD), the Meshing Application has produced a mesh accommodating curvature, a reasonable sizing strategy and automatic selection of optimal mesh methods with minimal user input. There are many ways in which the Meshing Application can control and improve the mesh. Some further mesh controls will now be demonstrated. ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-36 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Named Selections Training Manual velocity-inlet-2 velocity-inlet-1 10.Set the Selection Filter to Faces and select one of the pipe end faces as shown. Right-click in the Model View and choose Create Named Selection. Enter velocity-inlet-1 for the Selection Name 11. Repeat for the other two pipe end faces using the naming as shown 12.The Named Selections just created are listed in the Outline by expanding Named Selections. The names assigned here will be transferred to the CFD solver so the appropriate flow conditions can be applied on these surfaces. ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights pressure-outlet 2-37 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Inflation Training Manual 13.Select Mesh in the Outline and expand Inflation in Details 14.Set Use Automatic Tet Inflation to Program Controlled, leave other settings 15.Right click on Mesh and select Generate Mesh. Note the inflation layers are grown from all boundaries not assigned a Named Selection. The thickness of the inflation layers is calculated as a function of the surface mesh and applied fully automatically. ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-38 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Section Planes Training Manual 16.Orient the model by clicking on the axis triad (+X Direction) After the Section Plane has been created the Section Plane cursor tool will still be active. Left clicking in the viewport and dragging will slide the Section Plane along its axis. 17.Click on the New Section Plane icon in the menu bar. Left click, hold and drag the cursor in the direction of the arrow as illustrated to create the Section Plane Clicking on either side of the Plane tool will cut the mesh on each side respectively. Clicking twice on one side will change the view to a planar slice. When the position is finalized, select a view manipulation tool 18.Created Section Planes are listed (bottom left). Planes can be individually activated using the checkbox, deleted and toggled between 3D element view and 2D slice view. Try this now (you will need to rotate the model to see the cross-section) ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-39 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Mesh Statistics Training Manual 19.If you expand the Statistics entry under Mesh, it will summarize the number of nodes and elements in the mesh 20.Under Mesh Metric select Skewness. Note the reported mesh quality ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-40 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Transferring Mesh to CFD Training Manual 21.After the mesh has been generated, you can transfer it to a new CFD simulation 22.In the main Workbench Window, right click on the Mesh entry in the Meshing instance you created on the Project Schematic and observe that you can transfer the mesh to a new FLUENT or CFX simulation (Transfer Data To New >). Select either FLUENT or CFX 23.Note that the Mesh entry now has an Update symbol, right click the Mesh entry and select Update. This will pass data to the new FLUENT/CFX instance. ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-41 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application Fluent with Workbench Mesh Training Manual 24.If FLUENT was selected - Double click the Setup entry and accept the default options in the FLUENT Launcher 25.FLUENT will start with the mesh loaded 26.Save the project from the Workbench File Menu ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-42 April 28, 2009 Inventory #002645 Introduction to the ANSYS Meshing Application CFX with Workbench Mesh Training Manual 27.If CFX was selected - Double click the Setup entry, CFX Pre will launch with the mesh loaded 28.Save the project from the Workbench File Menu ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights 2-43 April 28, 2009 Inventory #002645