Computation Fluid Dynamics ANSYS Software Key Features and Best - - PowerPoint PPT Presentation

Computation Fluid Dynamics – ANSYS Software Key Features and Best Practices

• Dr. Wim Slagter

Lead Product Manager, ANSYS, Inc.

Courtesy of Borg Warner Turbo & Emissions Systems Courtesy of CADFEM Russia

ANSYS, the company

• ANSYS design, develops, markets

and globally supports a comprehensive range of engineering simulation software

• Proven software technologies for
• Fluid Dynamics
• Structural Mechanics
• Acoustics
• Electromagnetics
• Multiphysics
• Specialized tools, incl.
• ANSYS Icepak (thermal/flow

for electronics)

• ANSYS nCode DesignLife (for

fatigue)

• World’s largest pool of experts

providing CFD Best Practices

Emag Acoustics Structural

CAD Import Parametric Simulation Design Exploration Meshing Post- processing

Fluid

ANSYS – addressing your current & future CFD challenges

Transient or steady-state Laminar and turbulent flows Heat transfer Buoyant flows Incompressible / compressible Multi-component flows, multi-phase Real gas modeling Filters/porous regions Reactions and combustion Moving geometry and mesh Rotating machinery Solution-based adaptive remeshing 1-way and 2-way Fluid-Structure Interaction

Courtesy of GE Energy Courtesy of BMW AG

Key Enablers:

• Links to almost any CAD system
• Parametric, persistent process
• Simulation focused: allows

engineers to do simulation driven product development

• Direct modeling allows for re-

animating dumb CAD (geometry without parameters) models

• Extensive modeling solutions

Engineering Productivity: Geometry Modeling

Bi-directional CAD connections Feature-Based Modeling Direct Modeling

CAD Neutral: Direct and Feature-Based Modeling!

Setup Wizards

Engineering Productivity: Workflow

Geometry Meshing Problem Setup Post Processing Customized Menus

Increased Productivity through Automation and Customization!

• Advanced physical models
• High-performance solvers

Engineering Productivity: Accuracy & Speed

User-defined LES for highest accuracy; RANS for all other areas RANS LES

Re=395

New steady-state scheme as accurate as transient Wigley hull simulation

Free surface profiles

• Steady-state scheme
• Transient scheme
• Experiment

0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.0 0.5 1.0 1.5 Cavitation number Head rise coefficient Hofmann et al [20] CFD

Recondisation simulation Cavitating flow in a centrifugal pump can also be modeled in steady state

Get reliable answers faster, without compromise on flow physics!

Integrated Design Exploration & Optimization

Tradeoff Chart Parametric CAD model Response Surface and Sensitivity Chart

Section Length Guide Curve Angle Guide Curve Radius Effective Flow Area Section Length

DOE generated with Design Points

Guide Curve Angle (Deg) Guide Curve Radius (mm) Section Length (mm) EFA (mm2) Baseline 63 41 51 1100.2 Optimized 50 30 60.5 1180.4

Baseline Design Optimized Design

Gain deep insights necessary to

• ptimize product performance, and

produce better products faster!

Drag s sensitivity Downforc rce s sensitivity Total p pressure d drop s sensitivity Total p pressure d drop s sensitivity

Estimated downforce improvement = 41.6N Actual downforce improvement = 39.1N

Adjoint flow solver:

• An understanding of the shape sensitivities with respect to design variables

in a single computation!

• A quantitative performance estimate due to a design change without the

need to simulate the actual change!

Adjoint is a very efficient means of quickly exploring a design space with thousands degrees of design freedom!

Shape Sensitivities wrt Design Variables

Fluid Flow Thermal Stress

Fluid-Structure Interaction

Rigid Body FSI 1-way FSI 2-way FSI

Deformation

Courtesy of Embraco

Comprehensive suite of FSI capabilities for accurate prediction of a broad range of design scenarios

• Design objective:
• Maximize amplification ratio for a given size and power consumption
• 3 main design parameters, i.e. gap in annular ring, internal profile of ring,

profile of external ramp

• Customer benefits include:
• Explored 10-fold of design variations than would otherwise have been

possible (each day 10 instead of 1)

• Improved performance 250% over original design

Customer Example: Dyson Air Multiplier™ Fan

Courtesy of Dyson

• Design objective:
• To optimize the dual-outlet exhaust manifold for robust performance
• 4 main design parameters, i.e. outlet diameter of the manifold, thickness

at inlet, external temperature, engine RPM

• Design constraint:
• Maximum displacement should not exceed 1.5 mm!

Customer Example: Exhaust Manifold

Fluid Flow Deformation Von Mises Stress Temperature

• Design objective:
• To optimize the dual-outlet exhaust manifold for robust performance
• 4 main design parameters, i.e. outlet diameter of the manifold, thickness

at inlet, external temperature, engine RPM

• Design constraint:
• Maximum displacement should not exceed 1.5 mm!

Customer Example: Exhaust Manifold

Fluid Flow Deformation Von Mises Stress Temperature

All samples report maximum deformation below 1.5 mm Effect of engine speed and thickness at outlet on maximum deformation

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