acusolve_overview_2010.ppt [只读]

Overview Presentation2010

Flow Over a UAV with Flexible Wing

Ø CompanyØ Products Ø CustomersØ Fluid Structure InteractionØ CAE AutomationØ Summary

OutlineOutlineOutline

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ACUSIM Software IncACUSIM Software Inc

n Farzin Shakib – President & Founderl Ph.D. Stanford University (1989)

Ø Finite Element Analysis of Compressible Navier-Stokes Eq.Ø Post Doctoral work at NASA Ames Research Center

l Lead architect and fluids developer at Centric Engineeringl Founder, President & CTO of ACUSIM Software, Inc.l Over 20 years of software development in FEA & CFD

in Finite Element analysis and CFD

Pressure Contour on Blade Surfaces of Blood Pump

Ø Products:Ø AcuSolve™:

Next-generation finite-element based CFD flow solver; A premier CFD brand used by manufacturers and researchers globally

Ø AcuConsole™: GUI-based Pre-processor

Ø Services:Ø Consulting ServicesØ Technical Training

and Support

Products and ServicesProducts and ServicesProducts and Services

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Customers (Sample List)Customers (Sample List)Customers (Sample List)

TestimonialsTestimonials

"AcuSolve is unique and powerful. We have employed AcuSolve for some of our most challenging CFD

problems including vortex shedding around bridge piers, ventilation in mining facilities and complex

radiation heat transfer. The results are fast, reliable, scalable, and very stable - all required for a real-world

engineering project."---- Jon Berkoe

Manager Advanced Simulation & AnalysisBechtel National Inc.

“AcuSolve has been a staple at Whirlpool since 2004. The speed,

accuracy and robustness, ofAcuSolve have allowed us to take

simulation to the next level.AcuSolve is key to our simulation

based design strategy.”

Tom Gielda, Global MechanicalStructures & Systems

(see next few slides for examples)

"ACUSIM’s approach to direct-coupling provides a very powerful capability for the FSI solution space. The coupling of AcuSolve and Abaqus combines

specific, class-leading capabilities from each application and presents a strong offering to solve the most challenging FSI problems."

Ken Short Vice President of Strategy and Marketing

SIMULIA

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Whirlpool: Simulation Based Design Model Whirlpool: Simulation Based Design Model for Cookingfor Cooking

n All Cooking Productsl Standardl Convectionl Microwave

n Coupled Analysisl Transientl Gray Body Radiationl Conjugate Heat Transferl Multi-Species l Include Oven Control

(Software in the Loop Testing)n Parametric Geometry

l Auto-meshingl Automated input deck preparation

Courtesy

Whirlpool: Example Oven Thermal AnalysisWhirlpool: Example Oven Thermal Analysis

Temp contours at 5.0 minutesFood temp variation from average at 5.0 minutes

Potential poor performance

Courtesy

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Whirlpool: Whirlpool: AcuSolveAcuSolve Results Calibrate well to testResults Calibrate well to test

Tub Boss Surface TempSimulation

W

Courtesy Whirlpool

AcuSolveAcuSolve™™

Ø A powerful general-purpose finite element flow solverØ AcuSolve’s differentiation:Ø Robustness Most problems solved on the first attemptØ Speed Coupled solver on distributed parallel

machinesØ Accuracy Highly accurate in space and time

while globally/locally conservativeØ Features Rich set of functionality

Ø An ideal enabling technology for integrated engineering and scientific applications

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AccuracyAccuracyn Galerkin/Least-Squares finite element formulation:

l Originated at Stanford University by Prof. T.J.R. Hughes et. al.l Over 25 years of history in academia and industry l Very rich mathematical foundation

Ø Convergence proofsØ Error estimationØ Localization proofs, etc.

l Further enhanced at ACUSIM for large and complexindustrial applications

Page 12

Accuracy: Independent of Element TopologyAccuracy: Independent of Element Topologyn What matters is the # of nodes and not topologyl Higher-order accurate, yet robust

Ø Second-order accurate in time and spacen Accuracy is independent of Element topology

Ø ALL VARIABLES: Velocity, Pressure, Turbulence, Temperature, Species, n Competitors usually “first order” turbulence

l Globally and locally mass, momentum and energy conservative

n Unstructured Mesh:l 4-node tetrahedronl 5-node pyramidl 6-node wedgel 8-node brickl 10-node tetrahedron

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RobustnessRobustnessn Avoids the problems of the classical approach which use

segregated solversn Directly solves the fully coupled system of (u,v,w,P)

l Can add Energy equation as well (u,v,w,P,T)Ø Unique to AcuSolve

n Devised a proprietary iterative linear solver plus preconditionerwhich allows fast and robust solution of the coupled system

n The resulting nonlinear/linear solver is:l Robust, even for high aspect ratio

and distorted elementsl Efficient, in CPU and memory

utilizationl Practically parameter free, requires

little or no user interventionØ UR=0 by default

Page 14

Speed: Parallel ProcessingSpeed: Parallel Processingn Developed for Parallel Scalability

l Domain decomposition (Metis) is used to distribute elements and nodes to different processors

l Process is transparent to the user

n MPI/OpenMP used for distributed-memory/shared-memory machinesl HPMPI provided at no

cost to AcuSolve customers

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Ø Incompressible & weakly compressible Navier-StokesØ Mach < 1.0

Ø Thermal analysisØ Conjugate heat transferØ Thermal ShellsØ Solar RadiationØ Enclosure Radiation

Ø View Factors

Ø Turbulence Modeling:Ø RANS ModelsØ LES, DES & DDES

Ø Multi-species transport equationsØ Support for Computational Aero Acoustics simulations


Ø Arbitrary Lagrangian Eulerian (ALE) mesh motionØ Flexible mesh motionØ Free surfaceØ Guide surfaceØ Sliding mesh

Ø Fluid/Structure InteractionsØ Practical FSI (P-FSI)Ø Direct Coupling FSI (DC-FSI)Ø Rigid body dynamics

Ø And more..

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Sample Functionality: Rich Set of Material OptionsSample Functionality: Rich Set of Material Options

n Newtonian and non Newtonian fluidsl Isentropic and ideal gas law supported

n Porous median Melting and heat of formationn User-defined function

50 rpm 150 rpm 400 rpm

Xanthum Gum & CarbopolAdditive (0.1%) makes fluid

Non-NewtonianEFD via dye injection

Cavern size and shape: experiments (left half)simulations (right half)

EFD CFD EFD CFD EFD CFD

Page 18

Functionality: Sliding & Moving Mesh for ValveFunctionality: Sliding & Moving Mesh for Valve

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Customer Validation: Aerodynamics of Passing Trains

8.5 ft

n Equipment Dimensions and Spacingl 7 passes made between 60 and 130 mph

N

Direction oftravel

WheelCenter

158 in.

32 in.nominal

20 in. nominal

40 ft.48 ft.

HS

NE

L

Con

tain

er

Well Car12 ft.

Page 20

Customer Validation (Continued)

Acela Train Passing a Freight CarAnalysis & Test Data

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Thermal ExamplesThermal Examples

Example: SGI MIPS R10000 Heat Sink

n Board configurationn Air speed of 200 ft/min at 20 C; Power output of 50

wattsn Temperature field (38 - 53 C):

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Thermal: SGI MIPS R10000 Heat SinkThermal: SGI MIPS R10000 Heat Sinkn Solution verification: wind tunnel configurationn Air speed of 200 ft/min at 20 C; Power output of 50 wattsn IR image from thermal camera

Experiment AcuSolve

AcuSolve for Comprehensive Cell Phone Thermal Analysis

Natural Convection

Complex CasesThermal Conduction

High Density PCB and complex designs

Longer Battery LifePower Source

Conduction, Convection &

Radiation Routes

Example Mesh-Green=solid elements for conductionheat transfer, blue is fluid elements.

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Thermal: Automotive Cabin ModelingThermal: Automotive Cabin Modeling

n Interior temperaturen Flow distributionn Solar radiationn Enclosure radiationn Thermal shellsn Occupant comfort

Sunroof

Solar Heat Flux (W/m2)

15

20

25

30

35

40

45

0 5 10 15

Time (min)

Tem

pera

ture

(C)

InletCabin averageDriverFront passengerRear L. passengerRear R. passenger

Animation of Heat Changer Fan BankAnimation of Heat Changer Fan Bankn LNG regassification heat exchanger

l 1 row of 6 fansl 3-D

Temperature (K)

• AtmosphericAir Flow= 0 km/hr

at 77 F (298 K)ambientconditions

•Heat ExchangerRejects air at 279 K /

43 F

•Key issue is cold air being entrained or

blown into intake fanof heat exchanger

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Thermal Plume Study (customer example)Thermal Plume Study (customer example)

Air Flow

AcuConsoleAcuConsole™™

Ø A GUI-based pre-processor for AcuSolveØ Import CAD ( Parasolid, ACIS, ProE, CATIA )Ø Import mesh data ( including Nastran, STL etc. )Ø Mesh GenerationØ AcuSolve SetupØ Launch AcuSolveØ Solution MonitorsØ 3rd party visualizersØ CustomizationØ Automation

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ArchitectureArchitecture

AcuConsole

Python Interface (not Tcl, Perl, or Java)

QtGUI Engine(commercial)(trolltech.com)

HDF5 Data Base(open source)(NCSA.org)

Coin3D3D Graphics

(commercial)(sim.no)

GeomSimCAD Reader

(commercial)(simmetrix.com)

MeshSimMeshing

(commercial)(simmetrix.com)

AcuFieldviewPost Process

Data Viz(commercial)

(Intelligent Light)

Page 30

Example of Example of AcuConsoleAcuConsole Meshing:SparMeshing:Spar VortexVortex--Induce Motion (VIM)Induce Motion (VIM)n Example

l AcuConsole 64bit (LINUX64)l Nodes = 3,983,479l Elements = 23,335,804l 10 Boundary Layers

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AcuConsoleAcuConsole™™ ProcessProcess

Ø Import fluid CAD model into AcuConsoleØ Classify geometric faces and regions into different groups ( inflow,

outflow, air, water etc. )Ø Set mesh attributesØ Generate meshØ Set boundary conditionsØ Set material modelsØ Set solution strategyØ Run AcuSolveØ Post process

FSI TechnologyFSI Technology

Ø Practical FSI (PFSI)Ø Modal response of solid/structure

given to AcuSolveØ AcuSolve runs by itself

Ø Fast, easy and robustØ Linear solid/structure interactions

Ø Released Q2-2004Ø Abaqus, Ansys, Nastran, Radioss

Ø Direct-Coupling FSIØ Tight coupling of AcuSolve & Solid/Structural Code

Ø Two codes run in tandem exchanging forces/displacements on solid wet surface

Ø Projection & interpolation performed by AcuSolveØ No intervening middleware

Ø Released Q2-2007 With Abaqus 6.7, Q2 2010 with MSC MD NASTRAN

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PFSI PFSI -- Advantages & LimitationsAdvantages & Limitations

Ø Advantages:Ø The fluid and solid codes are run independently and separately

Ø No run time coupling is requiredØ No fluid mesh size limitation imposed by FSI

Ø Significantly more stable than alternative approachesØ Eliminates high wave number modes, yields smooth coupling

Ø Very efficientØ Problem setupØ CPU time

Ø Limitations:Ø Only linear solid/structural analysis

Ø No material or geometric nonlinearitiesØ Only simple contacts

DirectDirect--Coupling FSICoupling FSI

Ø Linear/Non-linear solid/structure Ø Most multi-code couplings are based on Conventional

Sequential Staggered (CSS)Ø Work well for problems with high mass-density ratio ( solid mass /

displaced fluid mass )Ø Unstable for moderate to low mass-density ratios

Ø ACUSIM has developed a new technology calledMulti-Iterative Coupling (MIC)Ø Excellent performance for a

wide-range of relative mass-densityand frequency ratios

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CAE AutomationCAE Automation

Ø UsersØ Engineers, Designers and Analysts

Ø WhyØ Encapsulation of CFD expertise Ø Standardization – Simulation FidelityØ Design optimizationØ Expedite non-value added aspects of the processØ Simplify the user interface

Ø CharacteristicØ FlexibleØ Easy to use

CAE AutomationCAE Automation

Ø Three main components;Ø Information

Ø What is available, which can be used to create an automated procedure

Ø Logic (Rules)Ø How to map the information to simulation setup

Ø Process Control - Work FlowØ Which aspects of setup need to be automated

Information Logic Process Control

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Information and LogicInformation and Logic

Ø InformationØ Geometry information

Ø Assembly/Part names, Ø volumes, areas, lengths etc

Ø Attributes in the CAD modelØ String, Real or Integer parametersØ Colors of faces and parts

Ø Material database Ø User variables in AcuConsoleØ Corporate database systems etc.

Ø LogicØ Logic uses above information to make automation decisions

Ø Surface at minimum flow direction is “inflow”Ø If the geometry type of a face is cylindrical it is a pipe wallØ If the motor type is from Vendor A, use fan curve A in the system

Ø Logic is set in AcuConsole database or using a python script

Example Example –– Heat ExchangerHeat ExchangerØ Information: Geometry type and Flow Direction

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Example Example –– Wind TurbineWind TurbineØ Information: Part Names, Flow Direction, CAD Attributes

Example Example –– RefrigeratorRefrigeratorØ Information: CAD Attributes, Corporate Database, UDF

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SummarySummary

Ø AcuSolve is a powerful general purpose CFD codeØ Next Generation Finite Element based CFD solverØ Rich set of features

Ø AcuSolve has two FSI capabilitiesØ Practical FSIØ Direct-Coupling FSI

Ø AcuConsole is a GUI based pre-processor that,Ø Provides easy to use interfaceØ Enables Customization and automationØ AcuSolve’s robustness is a key enabler

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acusolve_overview_2010.ppt [只读]

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