Overview of Modeling Capabilities Laminarandturbulent Steady-stateandtransient Incompressibletofullycompressible (subsonic,transonic,supersonic)

Idealandrealgases Newtonianandnon-Newtonianfluids Heattransfer Radiation Rotatingandstationary Eulerianmultiphase Freesurfaces(VoF) Lagrangianparticletracking Chemicalreactionsandcombustion Meshmotionandremeshing Immersedsolids Fluidstructureinteraction

Detailed Outline of Modeling Capabilities

Boundary Conditions Inlets - Subsonic,supersonicandmixed(combinedsubsonic and supersonic) -Velocity,massflowandflowdirection,staticpressure and direction, total pressure and direction, velocity and staticortotalpressure(supersonic),staticpressureand totalpressureanddirection(supersonic),zerogradient - Total temperature, total enthalpy, static temperature Outlets - Subsonic and supersonic -Massflow(withpressureprofileorcircumferential averagepressureprofile),velocity,uniformstatic pressure, average static pressure, radial equilibrium pressure distribution, circumferential average static pressure, degassing condition, meridional pressureprofile,supercritical,zerogradient Opening(mixedinflow/outflow) - velocity,total(in)/static(out)pressureanddirection, static(in)/static(out)pressureanddirection,localflow direction or entrainment Wall -Noslip,freeslip,finiteslip,specifiedwallshear, smooth, rough, moving, adiabatic, temperature specified,heatfluxspecified,heattransfercoefficient andreferencetemperaturespecified,opaque,black body, radiation intensity Symmetry Thinsurfaces/baffles 1-Dor2-Dprofilespecificationsforanyquantity

General Grid Interfaces Connectionofmultiplemeshesfromindependentsources

ANSYS CFX Technical Specifications Detailedcontrolofboundaryconditionsatnon-overlap-

ping portions of connections Rasterizedordirectmeshintersectionalgorithms

Multi-Domain and Domain Interface Models Translationalandrotationalperiodicconnections Translationalperiodicconnectionswithpressurechange ormassflowrate Fluidsolidinterfaceswithpitchandshapechange Porousdomainswithconservativealgebraicfluid-porous

interfaces Thinsurfacesbetweenfluidandsoliddomainsfor

modeling conduction, thermal contact resistance and coatings, and additional variables transfer

Stationaryandrotatingframesofreference Alternaterotationvelocityadvectionmodel Multipleframesofreferenceinterfacemodels - Stage interface model - Frozenrotorinterfacemodel - Transientrotor/statorinterfacemodel ProfileTransformationmodelfortransientbladerow

simulations with pitch changep

Turbulence Zero-andone-equationmodels Two-equationmodels:k-,RNGk-, k-,BSL,SST Reynoldsstresstransportmodels(second-momentclosure):LRR,SSG,QI,,BSL

ExplicitalgebraicReynoldsstressmodels(EARSMs):k-,BSL Largeeddysimulation(LES):Smagorinsky,dynamic,WALE Scalablewallfunctionsandautomaticnear-walltreatment

with integration to the wall User-definedturbulentwallfunctionsandheattransfer Roughwalltreatmentfor-based models, including with

transition Curvaturecorrectionforswirlingflowfortwo-equation

models Detachededdysimulation(DES)p Scaleadaptivesimulation(SAS)p PredictiveMenter-Langtry laminar-turbulent

transition modelp

Heat Transfer and RadiationThermalenergyandtotalenergyNaturalconvection(buoyancy)ViscousheatingConjugateheattransfer(CHT)solids PorousCHTdomainsAdvectioninrotatingandtranslatingCHTsolidsGray,multi-band,andmulti-gray(weightedsumofgray

gases) spectral modelsSpectralmaterialpropertydependenciesRadiationscattering

Radiationmodels -P1(diffuse) - Rosseland - Discrete transfer for participating media and surface-

to-surface radiation - Monte Carlo for participating media and surface-to-

surface radiationp

Combustionp User-definedreactionsandpre-supplieddatabase

of reactions Single-andmulti-stepeddydissipationmodel(EDM) Finiteratechemistrymodel CombinedEDM/finiteratechemistry,single-andmulti-

step EDMmaximumflametemperaturemodel Flameextinctionmodel Sparkandauto-ignition(knockandignitiondelay)models LaminarflameletwithpresumedPDFmodelfordiffusionflames

Premixed/partiallypremixedcombustion(coupledwithflameletPDFforpost-flamefrontmixingandreaction)

-Burningvelocitymodel(BVM) - Extendedcoherentflamemodel(ECFM),includingwall

quenching model Exhaustgasrecirculation(EGR)model Weightedreactionprogressmodelforpartiallypremixed combustion Choiceofpredefinedoruser-definedturbulentand

laminar burning velocity correlations NOxmodels Magnussonsootmodel Single-ormulti-phasecombustion Coalcombustionwithproximate/ultimatehydrocarbon

fuel analysis Chemistry(forexampleNOx)post-processingmode Realgascombustion Component-dependentturbulentSchmidtnumbers User-definableturbulentSchmidtandPrandtlnumbers

Additional User-Defined Transport Equations Scalarandvectoradditionalvariables Advectiveanddiffusivetransport Purelydiffusivetransport Poissonequation User-definedalgebraicequation Conjugateadditionalvariablesandadditionalvariables

in solid domains

Material Properties User-definedmaterialsandpre-supplieddatabaseof

materials Equationofstate - Ideal gas - Standard RedlichKwong - Aungier RedlichKwong - Soave Redlich-Kwong - Peng-Robinson - IAPWSIF-97(water) -Userdefined Specificheatcapacity - Constant - NASA format - Fourth-order polynomials -Userdefined Conductivity - Sutherlands formula -ModifiedEuckenkinetictheorymodel

-Userdefined Viscosity - Sutherlands formula - Rigid non-interacting sphere kinetic theory model - Rigid interacting sphere kinetic theory model -Userdefined Non-Newtonianviscositymodels -Bingham -Bird-Carreau - Carreau-Yasuda - Casson, Cross -Hershel-Buckley - Ostwald-de Waele -Userdefined Antoineequationforvaporpressurecurvesofpure

substances Multi-componentmixtures Electro-magneticproperties - Electrical conductivity - Magnetic permeability

Eulerian Multiphase Modelsp Homogeneousorfluid-dependentmassandmomentum

equations Homogeneousorfluid-dependentturbulenceequations Homogeneousorfluid-dependentenergyequations Unlimitednumberofphases Dragforcemodels - SchillerNaumann,WenYuandGidaspowdrag

models for solid particles - IshiiZuberandGracedragmodelsfordropsand

bubbles -Generaluser-defineddragcoefficient Non-dragforcemodels - Lift force models - Turbulent dispersion force model -Virtualmassforcemodel - Wall lubrication models - Solids pressure force model - Kinetic theory model Interphaseheattransfer - Specificationofinterfaceflux,heattransfercoefficient,

Nusselt number, two-resistance model, Hughmark or RanzMarshallcorrelations Interphasevariabletransfer - Specificationofinterfaceflux,transfercoefficient, Sherwoodnumber,HughmarkorRanzMarshall correlations

Interphasemasstransfer - Equilibrium phase change mode - Thermalphasechangemodel(evaporation,

condensation, bulk boiling) - Non-equilibrium droplet nucleation and phase change model(evaporation,condensation) -Cavitationmodel(RayleighPlesset) - Wall boiling model Multiplesizegroup(MUSIG)modelforpoly-dispersed

with breakup and coalescence Algebraicslipmultiphasemodel

Lagrangian Particle Trackingp One-wayorfullycoupledtwo-waymomentumtransfer Steady-stateortransient Movingmeshsupport Detailedcontrolofinjectionlocations,sizedistributions (6+distributionfunctions),etc. User-definedandpredefinedparticledragmodels

Non-dragforces(virtualmass,pressuregradientand turbulent dispersion) Primarybreakupmodels:BLOB,enhancedBLOB,LISA, turbulence-inducedatomization Secondarybreakupmodels:ReitzandDiwakar,TAB,ETAB,Schmehl,CAB

Advancedparticle-wallinteraction Virtualwallmodelforparticlereflectionsatroughwalls Quasi-staticwallfilmmodel Wallerosionmodels(user-defined,Finnie,Tabakoff) Stochasticparticle-particlecollisionmodel Extensivespraypenetrationdiagnostics Convective,latent,andradiativeheattransfer Evaporatingandboilingsingle-andmulti-component

liquid droplets Coalcombustionmodelwithproximate/ultimate

hydrocarbon fuel analysis Particletrackquantitiesaveragedontofluidmesh UserFortrancontrolofparticleinjectionandparticle

models Fullyparallelized Choiceofparticleterminationcriteria:distance,time,

composition

Free Surface Modeling Singlevelocityfield(VoF) Compressivediscretizationatfreesurface Surfacetension Zerogradientboundaryconditionsforvolumefractions

for automatic height calculation in subcritical free surfaceflows

Supercriticalflowoutlets Multiplevelocityfieldsforstrongmixing/entrainment

with separationp

Noise Modeling Lighthillstressoutput Exportofmonopole,dipoleandrotatingdipolesources

for acoustics solvers

General Source Term Models Isotropicanddirectionallossmodels - Linear and quadratic resistance models - Permeabilityandlosscoefficientmodels User-definedvolumetricsourcesofmass,momentum,

energy and species User-definedboundarysourcesofmass,momentum,

energy and species

Mesh Motion and Remeshing Steady-stateandtransient Diffusionofprescribedsurfacemeshmotion - Increased mesh stiffness for small elements and

near-wall mesh Explicitvolumemeshdeformation Solution-basedmeshadaption Integratedremeshingcontrol

Six Degree-of-Freedom Rigid Body Solver Implicitmotionofmeshregionsanddomains Detailedrigidbodysolutionandcouplingcontrol Expressionlanguageaccesstoallrigidbodystatevari-

ables

Immersed Solids Captureofmotionofsolidscompletelyorpartially overlappingwithfluiddomains

- Unlimited general solid motion without remeshing

Implicitmotionofimmersedsolidsbasedonrigidbodysolver solution

Fluid Structure Interaction (FSI) One-wayFSIcouplingwithANSYSstructuralmechanics

solutions for steady-state analysis Two-wayFSIcapabilityfortransientorsteady-state analysiswithmoving/deforminggeometry

Conservativeprofile-preservinginterpolationforfluiddynamicforcesandheatflows

Electro-Magnetic Hydrodynamics p Solutionofpotentialequationsforelectricandmagneticfields

Lorentzforceinfluidmomentumequations Resistive(Joule)heatinginenergyequation Conjugatetransferbetweenfluidandsoliddomains

Problem Setup and User Environment

Physics Pre-Processor Intuitivegeneralproblemdefinitionenvironment Wizardsforquicksetupofstandardproblemsand turbomachineryapplications(TurboPre)

User-definedGUIextensions Importofmeshesfromawidevarietyofsourcesand

formats, consisting of any combination of tetrahedral, hexahedral,prismand/orpyramidelements

Automaticgenerationofinterfacesbetweenphysicaldomains

Meshfaceregioncreationandediting Transformationandconnectionofmultiplemeshes Flexiblematerialpropertieseditor,includingalibraryof

common materials Flexiblechemicalreactionseditor,includingalibraryof

common reactions Expressionlanguageforgeneraluser-definedfunctions

for pervasive use, including for: - Parameterization -Boundaryconditionsandprofiles - Initial conditions - Fluid properties - Equation sources - Solution monitors Visualizationofprofileandexpressionboundary

conditions ExecutableinbatchmodewithfullaccesstoCFX CommandLanguage(CCL)powersyntaxforadvanced/custom applications and macros

Context-sensitiveonlineuserdocumentationwith hyperlinks

User Modeling and Solution Control Dynamictrackingofmonitorpointandboundaryflow

values Dynamiccommandfilereread Modifysolverparametersandboundaryconditionvalues

as solution proceeds Expressionlanguageforuser-definedfunctionsforfluidproperties,equationsources,boundaryconditionprofilesand initial conditions. A wide range of intrinsic functions are supported including:

-Dynamicevaluationofboundaryvaluesandflows - 1-D or 3-D cloud point data interpolation - User subroutine interface for fully programmable

user function

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Solver Technology

Numerics Conservativefinite-element-basedcontrolvolume

method Implicit,pressure-basedalgorithmforallflowspeeds,

incompressible to compressible Advectionmodeling - Upwind difference advection scheme - First- and second-order blend factor - High-resolution bounded advection scheme Boundedcentraldifferencescheme Robustandaccuratediffusiondiscretizationscheme Conservativefirst-andsecond-ordertransientdiscretiza-

tion with adaptive transient time stepping High-speednumericstreatmentforimprovedshock

capturing

Linear Solver Coupledsolutionofmassandmomentum,includingfor multiphaseflows(optionallywithvolumefraction

equation) Coupledsolutionofenergyformultiphaseflows Coupledsolutionofadditionalvariablesformultiphaseflows

Algebraicmulti-grid Incompletelower/upperfactorization(ILU)smoother Linearperformancewithincreasingnumberofnodes

High-Performance Computing HomogeneousorheterogeneousnetworksofLinux,

UNIXand/orWindows platforms PVMorMPIparallelcommunicationlibraries VendorspecificMPIsupport MPIsupportonLinuxforhigh-speedinterconnects (Myrinet,Infiniband,Quadrics)withHP-MPI Automateddomainpartitioningwithvariousalgorithms Partitioningacrossorwithinindividualdomains Highlyefficientparallelexecution Scalablememoryusage

Beta FeaturesANSYS CFX software at the ANSYS 13.0 release includes anumberofreleased(visible)andunreleased(hidden)beta features that demonstrate capabilities currently in development within ANSYS CFX. These capabilities are largely untested, unsupported and subject to change in future releases. All released beta features are visible in CFX-Pre if you select to enable them. Unreleased beta features are not generally visible within the product and usually entail activation of custom CCL, user Fortran or activation ofCFXsolverexpertparameters.Hiddenbetafeaturescanbe made available to selected users on demand. Some of the beta features available within ANSYS CFX software at release 13.0 include:

Released (Visible) Beta Features Non-reflectiveacousticboundaryconditions(inlet,outlet

and opening conditions supported) Independentphysicsmodelingbetweendisconnected

domains Additionalturbulencemodelsincludingone-equationSpalartAllmarasmodelandreattachmentmodification for SST

Iterativelyimplicitpressureaveragingatstageinterfacesand outlets

Iterativelyimplicitstageaveragingatstageinterfaces InhomogeneousMUSIGEulerianmultiphasemodel HomogeneousandinhomogeneousDQMOM Boundary-onlyadditionalvariables Particleuserroutinesformultiphasereactions Thermalandturbulenceeffectsforcavitation MeshdeformationforCHTsolids SurfaceexportusingCSVformat RadiationforEulerianmultiphase(bulk-andfluid-

dependent) Opaqueboundaryconditionfornon-walls Meshadaptionforporousdomains Domain-basedsolvercontrol Additionalmodelsfortransientbladerowsimulations

with pitch change - Time transformation - Fourier transformation

Unreleased (Hidden) Beta Features Stiffchemistrysolver Non-idealthermodynamicmixtureproperties Bradleysturbulentburningvelocitycorrelation Lindstedt-Vaoscombustionmodel ECFMmodificationforlaminarflamelimit Orthotropicthermalconductivityanddiffusivityfor

additional variables Electromagneticforceeffectsonparticles ModifiedCABdropletsecondarybreakupmodel Particlefragmentationforparticle-wallinteraction Finiteslipvelocityforalgebraicmassfractions Realliquidpropertysupportwithsaturationclipping Customizableuserinterface Turbulenceforcingforzonalscale-resolvingmodeling Particleinjectionbasedonlocalcoordinateframes Particlevelocitycomponentdefinitionforswirlinginjection Solution-dependentactivationofdomaininterface

connections Temperature-andpressure-dependentflameletlibraries G-equationcombustionmodel User-definedsparkignitionmodel Wallcondensationmodel Wallslipmodel Instantaneoussolutionfieldinpostprocessingon

transient particle tracks can be dropped in any case

p Capability included in ANSYS CFX but not in ANSYS CFD-Flotm