FLUENT Update - Ansys

FLUENT UpdateChris WolfeFLUENT Product Manager© 2007 ANSYS, Inc. All rights reserved. ANSYS, Inc. Proprietary

FLUENT Update Agenda• Brief History of FLUENT 6• Immersed Boundary Module for FLUENT 6.3• FLUENT 12– Current Status– Drivers– Performance and CAE Work– Physical Model Development© 2007 ANSYS, Inc. All rights reserved. 2 ANSYS, Inc. Proprietary

Immersed Boundary Module• Immersed Boundary Add-OnModule for FLUENT 6.3– Collaborative developmentbetween Cascade Technologiesand ANSYS/Fluent• Delivers a rapid, automated,preliminary design approach• Expected Release Date: Q1 2008with earlier Beta testing© 2007 ANSYS, Inc. All rights reserved. 5 ANSYS, Inc. Proprietary

IB Technique• A technique to obtain results withnon-body conforming meshes– Significantly reduces the time requiredfor geometry and mesh preparation– Avoids time-consuming and errorproneCAD to CFD geometryconversion and clean-up issues• Physical boundary conditionsenforced through reconstructionschemes that emulate body-fittedbehavior© 2007 ANSYS, Inc. All rights reserved. 6 ANSYS, Inc. Proprietary

Supported Models• Laminar and turbulent 3Dfluid flows using thepressure-based solver(segregated or coupled)– Spalart-Allmaras, k-epsilon, k-omega and DES turbulencemodels are supported for bothexternal and internal flows• Fully parallelized• Development underway tosupport convective heattransfer and ideal gases© 2007 ANSYS, Inc. All rights reserved. 7 ANSYS, Inc. Proprietary

FLUENT Update Agenda• Brief History of FLUENT 6• Immersed Boundary Module for FLUENT 6.3• FLUENT 12– Current Status– Drivers– Performance and CAE Work– Physical Model Development© 2007 ANSYS, Inc. All rights reserved. 8 ANSYS, Inc. Proprietary

FLUENT 12 Current Status• FLUENT 12 is currently under development– Completed main development iterations– Application and feature testing is underway• Cautionary Statements– Some features may ultimately not be available– Some features may still be “Beta” in the final release• FLUENT 12 Beta version is currently availablehttp://www.fluentusers.com/fluent12_beta/– Beta documentation is available for many features– Review release notes for available features© 2007 ANSYS, Inc. All rights reserved. 9 ANSYS, Inc. Proprietary

FLUENT Update Agenda• Brief History of FLUENT 6• Immersed Boundary Module for FLUENT 6.3• FLUENT 12– Current Status– Drivers– Performance and CAE Work– Physical Model Development© 2007 ANSYS, Inc. All rights reserved. 10 ANSYS, Inc. Proprietary

Drivers for FLUENT 12• Key CAE Environment Drivers– New Interface for FLUENT– CFD Post for FLUENT– Workbench Integration• Key Physics Drivers– In-Cylinder Engines– Coupled Solver for Eulerian Multiphase© 2007 ANSYS, Inc. All rights reserved. 11 ANSYS, Inc. Proprietary

New Interface for FLUENT• Re-factored FLUENT userinterface– More modern “Workbenchlike”look and feel– Single window• Option during start-up todetach graphics windows– Traditional FLUENT workflowmaintained– Available both stand-aloneand from within Workbench© 2007 ANSYS, Inc. All rights reserved. 12 ANSYS, Inc. Proprietary

New Interface for FLUENTMenu for Traditional WorkflowModel SummaryGraphics WindowNavigation PaneTask PageConsole/TUI© 2007 ANSYS, Inc. All rights reserved. 13 ANSYS, Inc. Proprietary

New Interface for FLUENT© 2007 ANSYS, Inc. All rights reserved. 14 ANSYS, Inc. Proprietary

CFD Post for FLUENT• Ability to use CFD Postwith FLUENT– Read native FLUENT caseand data files– More efficient transientpost-processing– Ability to compare differentdatasets– Automated HTML reportgeneration© 2007 ANSYS, Inc. All rights reserved. 15 ANSYS, Inc. Proprietary

CFD Post for FLUENT• Ability to use CFD Postwith FLUENT– Read native FLUENT caseand data files– More efficient transientpost-processing– Ability to compare differentdatasets– Automated HTML reportgeneration– Stand-alone 3D viewer© 2007 ANSYS, Inc. All rights reserved. 16 ANSYS, Inc. Proprietary

Workbench Integration• FLUENT integrated intoANSYS Workbench for v12– Allows access to geometry,meshing and postprocessingfrom within asingle project managementenvironment– Support for parametermanagement• FLUENT 12 will also beavailable stand-alone© 2007 ANSYS, Inc. All rights reserved. 17 ANSYS, Inc. Proprietary

Drivers for FLUENT 12• Key CAE Environment Drivers– New Interface for FLUENT– CFD Post for FLUENT– Workbench Integration• Key Physics Drivers– In-Cylinder Engines– Coupled Solver for Eulerian Multiphase© 2007 ANSYS, Inc. All rights reserved. 18 ANSYS, Inc. Proprietary

In-Cylinder Engines (1 of 3)• Meshing– Pure layering and smoothingof canted valves using IC3MICEM with IC3M plug-in© 2007 ANSYS, Inc. All rights reserved. 19 ANSYS, Inc. Proprietary

In-Cylinder Engines (1 of 3)• Meshing– Pure layering and smoothingof canted valves using IC3M– Layering with non-constantlayer height via UDF hookPure hex mesh generated byIC3M in valve region© 2007 ANSYS, Inc. All rights reserved. 20 ANSYS, Inc. Proprietary

In-Cylinder Engines (1 of 3)• Meshing– Pure layering and smoothingof canted valves using IC3M– Layering with non-constantlayer height via UDF hook– Activate/deactivate zones inparallel© 2007 ANSYS, Inc. All rights reserved. 21 ANSYS, Inc. Proprietary

In-Cylinder Engines (1 of 3)• Meshing– Pure layering and smoothingof canted valves using IC3M– Layering with non-constantlayer height via UDF hook– Activate/deactivate zones inparallel– Text command based events© 2007 ANSYS, Inc. All rights reserved. 22 ANSYS, Inc. Proprietary

In-Cylinder Engines (1 of 3)• Meshing– Pure layering and smoothingof canted valves using IC3M– Layering with non-constantlayer height via UDF hook– Activate/deactivate zones inparallel– Text command based events© 2007 ANSYS, Inc. All rights reserved. 23 ANSYS, Inc. Proprietary

In-Cylinder Engines (2 of 3)• Reporting– IC specific output panel• Swirl• Tumble• Power• Fuel consumption© 2007 ANSYS, Inc. All rights reserved. 24 ANSYS, Inc. Proprietary

In-Cylinder Engines (3 of 3)• DPM– Injection as a function of crank angle– IC specific vaporization laws• Combustion– Extended Coherent Flamelet Model– Exhaust Gas Recirculation– UDF hook for the ignition model© 2007 ANSYS, Inc. All rights reserved. 25 ANSYS, Inc. Proprietary

Multiphase Coupled Solver• Eulerian multiphase coupledsolver– Couples velocity and pressureequations– Option to solve volumefraction equations coupled– Available for populationbalance• Preliminary testing showsimproved steady-stateconvergence for many casesLateral vapor developmentin a subcooled waterchannel with a heated wall© 2007 ANSYS, Inc. All rights reserved. 26 ANSYS, Inc. Proprietary

FLUENT Update Agenda• Brief History of FLUENT 6• Immersed Boundary Module for FLUENT 6.3• FLUENT 12– Current Status– Drivers– Performance and CAE Work– Physical Model Development© 2007 ANSYS, Inc. All rights reserved. 27 ANSYS, Inc. Proprietary

Performance and CAE Work• Core Numerics• Parallel• Meshing• FSI via One-Way Coupling© 2007 ANSYS, Inc. All rights reserved. 28 ANSYS, Inc. Proprietary

Core Numerics• Improved accuracy androbustness– First-to-second-orderblending© 2007 ANSYS, Inc. All rights reserved. 29 ANSYS, Inc. Proprietary

Core Numerics• Improved accuracy androbustness• Improved transientefficiency– Variable extrapolationVariable ExtrapolationNo Extrapolation9,45712,100Force Integration vs. Time (top)and vs. Iteration (bottom)© 2007 ANSYS, Inc. All rights reserved. 30 ANSYS, Inc. Proprietary

Core Numerics• Improved accuracy androbustness• Improved transientefficiency• Improved adaptive timestepping• Solution steering forDB-implicit solver© 2007 ANSYS, Inc. All rights reserved. 31 ANSYS, Inc. Proprietary

Parallel• Improved standard file I/OStandard Data File Write10 million cellsTime (seconds)1008060402009x5x8 16 32 64 128FLUENT 6.3Number of processorsStandard Case File Write10 million cellsFLUENT 12Standard Data File Read10 million cellsTime (seconds)4003503002502001501005003x4 8Time (seconds)10080604020013x6x8 16 32 64 128Number of processorsNumber of processors© 2007 ANSYS, Inc. All rights reserved. 32 ANSYS, Inc. Proprietary

ParallelFLUENT 6.2FLUENT 6.3Standard I/OFLUENT 12Parallel I/Ofor Data FilesEvolution of parallel data handling in FLUENT© 2007 ANSYS, Inc. All rights reserved. 33 ANSYS, Inc. Proprietary

Parallel• Improved standard file I/O• Truly parallel I/O for data files– PVFS2, HP/SFS, IBM/GPFS,PanasasFSOpteron IB cluster with IBM/GPFS# Proc64 - Read64 - Write111 million cell caseStandardI/O153s315sParallelI/O79s182sSpeed-up1.9x1.7x128 - Read158s80s2.0x128 - Write313s236s1.3xOpteron IB cluster with HP/SFS (IB)# ProcStandardI/OParallelI/OSpeed-up64 - Read122s20s6.1x64 - Write95s51s1.9x128 - Read122s19s6.4x128 - Write93s64s1.5x© 2007 ANSYS, Inc. All rights reserved. 34 ANSYS, Inc. Proprietary

Parallel• Improved standard file I/O• Truly parallel I/O for data files– PVFS2, HP/SFS, IBM/GPFS,PanasasFS• Partitioning 1 billion cell cases(700M cells per processor/core)– Opteron/EM64T lnamd64 version© 2007 ANSYS, Inc. All rights reserved. 35 ANSYS, Inc. Proprietary

Parallel• Improved standard file I/O• Truly parallel I/O for data files– PVFS2, HP/SFS, IBM/GPFS,PanasasFS• Partitioning 1 billion cell cases(700M cells per processor/core)– Opteron/EM64T lnamd64 version• Improved parallel scalability andload balancingPartitions withoutLoad Balancing13.2 seconds/iterPartitions withLoad Balancing7.8 seconds/iter© 2007 ANSYS, Inc. All rights reserved. 36 ANSYS, Inc. Proprietary

Meshing• Reduced memory duringpolyhedral conversion• Anisotropic adaption atboundaries© 2007 ANSYS, Inc. All rights reserved. 37 ANSYS, Inc. Proprietary

FSI via One-Way Coupling• FSI via one-way couplingfrom within FLUENT 12– ANSYS (w/o Workbench)– 3 rd party FEA codes• ABAQUS, I-deas,NASTRAN, PATRAN– Surface and volume mapping• Structural and thermal loadson surfaces• Temperature in volumes– Read in FEA mesh, interpolateFLUENT data, export– Display imported mesh withFLUENT mesh© 2007 ANSYS, Inc. All rights reserved. 38 ANSYS, Inc. Proprietary

FLUENT Update Agenda• Brief History of FLUENT 6• Immersed Boundary Module for FLUENT 6.3• FLUENT 12– Current Status– Drivers– Performance and CAE Work– Physical Model Development© 2007 ANSYS, Inc. All rights reserved. 39 ANSYS, Inc. Proprietary

Physical Modeling Areas– Boundary Conditions– Mixing Planes– Turbulence– Multiphase– DPM– Reacting Flows– Real Gas– Radiation– Fuel Cells© 2007 ANSYS, Inc. All rights reserved. 40 ANSYS, Inc. Proprietary

Inlet Boundary Conditions• Extensions for pressure andmass flow inlets– Specify swirl component– Specify inlet condition all inrelative or absolute referenceframe (density-based solver)© 2007 ANSYS, Inc. All rights reserved. 41 ANSYS, Inc. Proprietary

Inlet Boundary Conditions• Extensions for pressure andmass flow inlets– Specify swirl component– Specify inlet condition all inrelative or absolute referenceframe (density-based solver)• Mass flow inlets as outflowboundaries– Added for density-basedsolver– Outward flow profilepreserved (both densitybasedand pressure-based)© 2007 ANSYS, Inc. All rights reserved. 42 ANSYS, Inc. Proprietary

General Boundary Conditions• Pressure outlets– More robust target mass flow rate– Individual pressure limits formultiple pressure outletsinletoutletsManifold Geometry© 2007 ANSYS, Inc. All rights reserved. 43 ANSYS, Inc. Proprietary

General Boundary Conditions• Pressure outlets– More robust target mass flow rate– Individual pressure limits formultiple pressure outlets• Pressure far-field– Cylindrical flow specification• Non-reflecting boundaryconditions– Compatible with non-conformalinterfaces and dynamic mesh© 2007 ANSYS, Inc. All rights reserved. 44 ANSYS, Inc. Proprietary

General Boundary Conditions• Pressure outlets– More robust target mass flow rate– Individual pressure limits formultiple pressure outlets• Pressure far-field– Cylindrical flow specification• Non-reflecting boundaryconditions– Compatible with non-conformalinterfaces and dynamic meshContours of static pressureon an axial compressor• Alternative mixing plane profileaveraging methods© 2007 ANSYS, Inc. All rights reserved. 45 ANSYS, Inc. Proprietary

Turbulence• Turbulent Transition Models– SST transition model– Improved Walters model– UDF access to SST transitioncorrelationsAir FoilMach=0.15Angle of Attack = 13.3 oSkin Friction CoefficientPressure CoefficientExperimentaltransitionlocation x/c=0.12© 2007 ANSYS, Inc. All rights reserved. 46 ANSYS, Inc. Proprietary

Multiphase• Multi-fluid VOFmodel– Non-sharedvelocity formulation• Explicit interfacetracking schemefor the Eulerianmultiphase modelBubble rising through a slurry of granular solids inwater. DPM is used to track the red particles with thegranular phase velocity© 2007 ANSYS, Inc. All rights reserved. 47 ANSYS, Inc. Proprietary

Multiphase• Eulerian Multiphase– Ability to model filtrationusing porous media– Universal drag law• VOF– Numerical Wave TankBoundary Condition– Ability to plot phase IDswhen more than 2 phasesare presentAn iso-surface of gasvolume fraction at oneinstant during the bubblecolumn operation© 2007 ANSYS, Inc. All rights reserved. 48 ANSYS, Inc. Proprietary

Cavitation• Cavitation– Improved robustness forFLUENT cavitation model– Addition of CFX modelResiduals for fuel injector caseTemperature distribution on fuel injectorVapor volume fraction in fuel injector© 2007 ANSYS, Inc. All rights reserved. 49 ANSYS, Inc. Proprietary

Population Balance• Independent breakage frequency and breakage pdffunctions for breakage kernels• New breakage pdf functions– Parabolic pdf– Generalized pdf for multiple breakage• New breakage frequency functions– Lehr model for gas-liquid– Coulaloglou and Tavlarides for liquid-liquid– Ghadhiri’s mechanistic model for gas-solid• New aggregation kernels– Turbulent model and free molecular model for liquid-solid© 2007 ANSYS, Inc. All rights reserved. 50 ANSYS, Inc. Proprietary

Discrete Phase Model• Dense Discrete Phase Model– Permits tracking of particles usingDPM as a secondary phase in anEulerian simulation– Volume fraction and dragconsidered like an Eulerian phase• Discrete Phase Model– Massless particles for residencetime distribution– Improved robustness and usabilityParticles in a fluidized bedcolored by particle velocity© 2007 ANSYS, Inc. All rights reserved. 51 ANSYS, Inc. Proprietary

Reacting Flows• DQMOM-IEM model• Stiff chemistry for EulerianMultiphase• KINetics– Multiple surface mechanisms– Evaluate specific heat and enthalpy• New user-defined function hooks– Properties for partially premixed– Turbulent Schmidt number– Temperature dependent sensible heatand enthalpy© 2007 ANSYS, Inc. All rights reserved. 52 ANSYS, Inc. Proprietary

Real Gas Model• Real gas model added forpressure-based solver• New built-in Aungier-Redlich-Kwong law• Reactions with real gasmodel• New post-processingSubcritical methane combustion withbuilt-in Aungier-Redlich-Kwong law© 2007 ANSYS, Inc. All rights reserved. 53 ANSYS, Inc. Proprietary

Heat Transfer/Radiation• Alternative view factor calculation methods– Ray-tracing– Cluster-to-cluster• Shell conduction improvements– Temperature dependent thermal conductivity– Compatibility with semi-transparent walls– Improvements for parallel• Solar load model enhancements– Control solar transmissivity through boundaries© 2007 ANSYS, Inc. All rights reserved. 54 ANSYS, Inc. Proprietary

Heat Transfer/Radiation• DO radiation enhancements– Ability to model emission andabsorption for specular walls– Ability to specify beam directionat semi-transparent walls usingprofiles– Specification of the diffuseirradiation component at semitransparentwallsContours of Incident RadiationA profile used to specify beamdirection normal to the surface.• Extension for WSSGM– UDF Hook for black bodyemission factor (Planck’sFunction)© 2007 ANSYS, Inc. All rights reserved. 55 ANSYS, Inc. Proprietary

Dual Cell Heat Exchanger• Uses separate co-located meshesfor cold and hot streams• Advantages– Accounts for flow and propertyvariations in flow– Can handle non-rectangular heatexchangers• Dual cell model slightly moreaccurate than macro model– Further improvements are possibleTop Tank Temperature (C)72706866646260585662.68Top Tank Temperature PredictionFord Benchmark61.8163.8863.381 2 3TEST Code 1 FLUENTMacroFLUENTDualCompetitor Codes6470.9161.2Code 2 Code 3 Code 41. Experiment = 62.68 o C2. Macro Model = 63.88 o C3. Dual Cell Model = 63.38 o C© 2007 ANSYS, Inc. All rights reserved. 56 ANSYS, Inc. Proprietary

Fuel Cells• Ability to model SOFC using theresolved MEA framework• Resolved MEA frameworkimprovements– Automated stack set-up– Additional modeling options• Restrict gas diffusion across themembrane• Model flow and species transportinside current collectors• Multicomponent diffusion• Leakage current• Non-isotopic electrical and thermalconductivities in the gas diffusion layer(PEMFC)Contours of hydrogen in a fuel cellNon-conformal interfaces onanode (top) and cathode(bottom) side in a SOFC fuel cell© 2007 ANSYS, Inc. All rights reserved. 57 ANSYS, Inc. Proprietary

And much more…• Acoustics• Turbulence• Profiles• Pollutants• Reports• Post-Processing• For more information, please see the FLUENT 12 BetaRelease Notes and Documentation– http://www.fluentusers.com/fluent12_beta/© 2007 ANSYS, Inc. All rights reserved. 58 ANSYS, Inc. Proprietary

Thank you• Chris Wolfe, FLUENT Product Manager• FLUENT 12 Betahttp://www.fluentusers.com/fluent12_beta/– Beta documentation is available for many features– Review release notes for available feature– Log feedback!© 2007 ANSYS, Inc. All rights reserved. 59 ANSYS, Inc. Proprietary