Tips and Tricks Sweeping
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2/18/2015 Computational Fluid Dynamics (CFD) Blog LEAP Australia & New Zealand | Tips & Tricks: Sweep Meshing in ANSYS http://www.computationalfluiddynamics.com.au/tipsandtrickssweepmeshinginansys/ 1/4 UA336027821 About Us » Industry Focus Technical Benefits Business Benefits Tips & Tricks Contact Us Posted By LEAP CFD Team on Dec 13, 2011 | 2 comments For this post, we’ll discuss a topic which allows you to complement your understanding of global and local mesh controls that we have covered previously. Sweep meshing is a meshing method available in ANSYS Meshing that is important for all CFD users to understand and can be readily used to maintain high solver accuracy at the same time as reducing mesh cell counts (leading to a serious speedup in solve times). The Sweep Method begins by meshing a particular ‘source’ surface using either the automatic global settings, or any local sizing controls / inflation layers that have been applied by the user. It will then “sweep” the source mesh (which can represent any arbitrary crosssection) through the body, spacing it by a certain incremental dimension or by splitting the swept side faces into a desired number of divisions. Sweep Mesh Examples To fully utilise the benefits of the Sweep Method, it is useful to consider which regions of our domain will use the Sweep Method during the geometry stage (in ANSYS DesignModeler or when creating your fluid domain in your original CAD software). This allows us to appropriately decompose or slice our domain into a combination of individually “sweepable” bodies. It is useful when you first open ANSYS Meshing to Right click on “Mesh” in the lefthand model tree and choose the option to “Show” > “Sweepable Bodies”. Upon choosing this option, any bodies within your assembly that can be swept automatically will be shown in green on your screen. Home Tips & Tricks Tips & Tricks: Sweep Meshing in ANSYS Search for: Search Subscribe to email addr Sub Leading Engineering Australia: 1300 88 2 New Zealand: 09 97 Visit LEAP Website f CFD, FEA, CAD, CAM products, plus our tra schedule. Follow Recent Popular Usi pre gen and aero effe Nov 6 Sm app ma use Tips & Tricks: Sweep Meshing in ANSYS
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Transcript of Tips and Tricks Sweeping
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2/18/2015 ComputationalFluidDynamics(CFD)BlogLEAPAustralia&NewZealand|Tips&Tricks:SweepMeshinginANSYS
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About Us Industry Focus Technical Benefits Business Benefits Tips & Tricks Contact Us
PostedByLEAPCFDTeamonDec13,2011|2commentsForthispost,welldiscussatopicwhichallowsyoutocomplementyourunderstandingofglobalandlocalmeshcontrolsthatwehavecoveredpreviously.
SweepmeshingisameshingmethodavailableinANSYSMeshingthatisimportantforallCFDuserstounderstandandcanbereadilyusedtomaintain
highsolveraccuracyatthesametimeasreducingmeshcellcounts(leadingtoaseriousspeedupinsolvetimes).
TheSweepMethodbeginsbymeshingaparticularsourcesurfaceusingeithertheautomaticglobalsettings,oranylocalsizingcontrols/inflationlayers
thathavebeenappliedbytheuser.Itwillthensweepthesourcemesh(whichcanrepresentanyarbitrarycrosssection)throughthebody,spacingitbya
certainincrementaldimensionorbysplittingthesweptsidefacesintoadesirednumberofdivisions.
SweepMeshExamples
TofullyutilisethebenefitsoftheSweepMethod,itisusefultoconsiderwhichregionsofourdomainwillusetheSweepMethodduringthegeometrystage
(inANSYSDesignModelerorwhencreatingyourfluiddomaininyouroriginalCADsoftware).Thisallowsustoappropriatelydecomposeorsliceour
domainintoacombinationofindividuallysweepablebodies.
ItisusefulwhenyoufirstopenANSYSMeshingtoRightclickonMeshinthelefthandmodeltreeandchoosetheoptiontoShow>Sweepable
Bodies.Uponchoosingthisoption,anybodieswithinyourassemblythatcanbesweptautomaticallywillbeshowningreenonyourscreen.
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Tips & Tricks: Sweep Meshing in ANSYS
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ShowingSweepableBodies
Ifyouexpectedthatsomethingshouldhavebeensweepablebutitisnotshowningreen,thenyoumayneedtodecomposethedomainfurthersuchthat
anyproblematicbodieshaveatopologythatcanbeswept.Oftentheproblemisduetosomesmallsliversurfaceorotherareathatisinhibitingtheregular
gridlikemapmeshingofallsidefaces(alongthedirectionofthesweep)whichsimplyneedtobecleanedupbeforethiscanoccur.Thiscanbedone
eitherbackinDesignModeler,orusingVirtualTopologytoolsrighthereinANSYSMeshing.
Onceyouarehappywiththegeometry,youcaninsertasweepmethodbyRightClickingonMeshintheOutlineTreeandchoosingtoInsert>Method.
WethenchangethetypetoSweep,andchoosethebodythatweaimtosweep.
Ifwerequireinflationlayers,whichwegenerallydo(andwilldiscussinafuturepost),thenwechoosethesourcefacefortheSweepMethod(orfor
additionalcontrol,boththesourceandtargetfaces).Thisisrequiredsothatthemeshingapplicationknowsexplicitlywhichfacetomeshfirstbefore
sweepingthismeshedcrosssectionthroughtherestofthebody.
Atthispoint,wecanchoosetocreateaninitialmeshtoconfirmthatthesweptmeshcanbecreatedasexpected.Wecanthenapplyadditionalfacesizing
andinflationtothesourcefaceandgenerateafinalsweptmeshforthebody.Youcanseeintheimagebelowthatthesourcefaceontheendofthe
cylinderhasbeenmeshed,whichwasthenbroughtthroughthesweptsectionatspecifiedintervalsresultinginamappedquad(rectangular)meshonthe
sidefacesofthecylinder.
UnstructuredSweptMeshwithInflation
Ifthemeshonthesourcefacewasalsoentirelycomposedofaquadsurfacemesh,thentheentiremeshgeneratedwouldbehexahedral.Inthisparticular
case,wehavestartedwithtriangularsurfaceelementsonthesourceface(withquadelementsinthecriticalinflationlayerregion),whichresultsinahybrid
prism/hexmeshwithinthemeshedvolume.Theadvantageofthisapproachisthatitwillyieldmoreaccurateresultsthanafulltetrahedralmesh,inamuch
shortertimeduetoareducedtotalnumberofcells.Thisisparticularlytrueinflowalignedgeometriessuchasinternalflowthroughpipesorducts
witharbitrarilycomplexcrosssectionalshapes.
Inournextpost,wewillcontinuewithourdiscussiononpreferredmeshingmethodsforCFDbylookingathowtoaddInflationLayerstoyoursimulation.
WelldiscusstheirimportancetoCFDaccuracy,howtoproperlydefinethemandexplainthepreferredsettings.Inthemeantime,pleasecontactour
SupportTeamifyouhaveanyfurtherquestionsonmeshingforyourparticularapplications.
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vikramAPRIL2,2014
dearsir
weareanalysingtheflowinthedoubletubetypehelicalcoiledheatexchanger
inansys14.5
everytimewegetreversedflowinthepressureoutlet
whatcouldbetheproblem
LEAP Support TeamAPRIL9,2014
Wesuggestyoureviewyourcombinationofboundaryconditions,andwhetheravirtualplenumattheoutletmaybe
appropriatetospeedconvergence.Therearecaseswheresomereverseflowmayactuallyoccur(dependingonyour
flowconditionsandplacementofoutletrelativetoothergeometry),butitisimpossibletotellwithoutmoreinformation.We
suggestyoucontactyourlocalANSYSsupportpartneranddiscussinmoredetail.
Typethetext
modelswallfunctions
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