CFD and more with Acusolve and HyperWorks

CFD and more with Acusolve and HyperWorks

Innovation Intelligence®

Dr. Marc Ratzel, Program Manager CFD

David Corson, Program Manager AcuSolve

Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.

Agenda

•  Overview, CFD solutions in HyperWorks
•  Pre-processors / Solvers / Post-processors included in the HW suite

•  HyperMesh/HyperView for CFD applications
•  Grid generation in HyperMesh
•  Basic AcuSolve case setup in HM
•  Post-processing in HyperView
•  Outlook to next update release SA-130

•  Multi physics in AcuSolve
•  Overview of Multi physics capabilities
•  AcuSolve-Radioss coupling
•  Advanced model setup using AcuConsole

•  Efficient CFD analysis of a race car using Altair tools
•  HyperMesh, AcuConsole / AcuSolve / AcuFieldView


CFD solutions in HyperWorks

Radioss Radioss
(linear, static) (non-linear, implicit, dynamic)

Loads (T,p,
…) DC-FSI
P-FSI
(eigenmodes) (co-simulation)

AcuConsole AcuSolve AcuFieldView

HyperMesh Radioss HyperView
(CFD, FSI)

Pre-processor Solver Post-processor


Pre-Processing

•  AcuConsole
•  Dedicated pre-processor for AcuSolve
•  Fast and robust CFD meshing (e.g. 90Mio tetras external automotive 80min)

•  HyperMesh
•  Solver neutral CFD grid generator
•  Powerful geometry cleanup/generation tools
•  One pre-processor for structural and CFD analysis

HyperMesh AcuConsole


Solver

•  Radioss CFD/FSI
•  Explicit multi-physics solver
•  Coupled solver (structure + fluid)
•  Suited for compressible flow

•  AcuSolve
•  Implicit multi-purpose CFD solver
•  Finite element based
•  Strong FSI capabilities (P-FSI, DC-FSI)

Courtesy of HTT

AcuSolve Radioss


Post-Processing

•  AcuFieldView
•  Dedicated CFD post-processor (OEM version of FieldView, Intelligent Light)
•  Supports only AcuSolve results
•  Client-server architecture, 8 way parallel

•  HyperView
•  Solver neutral CFD post-processor
•  Showing structural and CFD results
pressure Top. Optim. streamlines
in one framework

eigenmodes

HyperView

AcuFieldView


Agenda

1.  Access to CFD meshing tools in HyperMesh
•  CFD user profile in HyperMesh
•  CFD tetramesh panel

2.  Demos
•  Basic meshing of an exhaust system
•  Considering variable boundary layer thickness
•  Improving mesh quality
•  Mixed tetra-hexa meshing

3.  Upcoming release SA-130, new meshing features

4.  Basic AcuSolve case setup in HyperMesh

5.  Post-processing of CFD results in HyperView


CFD user profile

•  New GUI design for CFD applications
•  Quick access to CFD features
•  Aligned to CFD workflow


CFD tetra mesh panel (access)

Drop down Toolbar

Panel


CFD tetra mesh (four sub panels)

Boundary selection
•  select boundaries
•  define regions with BL

Boundary Layer settings
•  1st cell height
•  # of layers

Tetramesh settings
•  growth rate
•  elem. criteria threshold

Refinement box
•  local tetra refinement
•  adapt size/location


Demo (variable BL thickness / mixed hexa-tetra mesh)

HyperWorks Desktop: one framework for pre + post


New CFD features, next release (SA-130)

•  Surface remeshing if included in refinement box

BL surface elements Remeshed surface
included with BL
Refinement box (tetra
mesh refinement)


Demo (refinement box, surface remeshing)



•  Define solid and fluid volume (e.g. electronic cooling)

Fluid (with BL)
Solid (no BL)

BL only in
fluid domain

Separate components
for each volume



•  Simple boundary selection option
•  Reduces the boundary selection to a minimum

Select all bounding regions
Select inflow/outflow

Simple selection

No BL on interfaces


Demo (simple selection, fluid/solid)


Basic AcuSolve case setup in HyperMesh

•  Currently only basic setup features are supported in HyperMesh
•  Further development planned for future

Physics/numerics

Comps, BC

Materials


Demo (AcuSolve setup in HyperMesh / HyperView for CFD)


AcuSolve case setup in HyperMesh

Property sheet Inflow BC
Property sheet Material def.


AcuSolve case setup in HyperMesh

AcuSolve Job Launcher AcuProbe


Alternative: HyperMesh à AcuConsole

•  Launch AcuConsole from HyperMesh and transfer model
•  Perform case setup in AcuConsole

HyperMesh

AcuConsole


Demo (Morphing, new run)


HyperStudy / Morphing for CFD optimization

Challenges: inflow

•  Increase manifold efficiency

Solution:
•  Create shape variables using HyperMorph
•  Run optimization to maximize flow uniformity
while meeting the constraints on back
pressure Cross section
for uniformity
Results :
•  7% increase in flow uniformity
•  2 days for design optimization outflow

initial design Velocity contour optimized design Velocity contour

Presented at EHTC 2009 by Bosal


Summary

CFD meshing (HyperMesh)
•  Wide range of geometry cleanup/generation functionalities
•  Solver neutral (AcuSolve, CFD++, CFX,…)
•  High quality volume grids (hybrid, hex-core, hex-only,..)

Next release SA 130
•  Various new CFD meshing features

Morphing for CFD
•  Quick design changes without re-meshing

CFD post-processing (HyperView)
•  Data exchange via Ensight format
•  Streamlines, contour plotting, iso-surfaces,…

AcuSolve
•  Basic AcuSolve case setup in HyperMesh

HyperMesh/AcuConsole/AcuFieldView
Race Car Model

Altair Engineering, Inc.
June 6, 2012


Race Car – Overview

•  What you will learn
•  How to use HyperMesh and AcuConsole together for model set-
up
•  Surface meshing in HyperMesh
•  Volume meshing in AcuConsole
•  AcuFieldView post-processing
•  Basic operation
•  Automation using restart files
•  Client-server operation
•  Client-server parallel operation


Race Car – AcuFieldView

AcuFieldView Overview Many New Features
•  OEM version of FieldView based on FV 13 •  Redesigned, unified Graphical User
•  Included with AcuSolve V1.8b product Interface
suite •  Sweep caching of transient data
•  Functions only with AcuSolve generated •  Improved graphics performance
results data •  New file browsers which recall previous
locations


Race Car – AcuFieldView

Fully featured
•  Supports all features of
FieldView AcuSolve
•  No model size limits
•  No limits on visualization Database
object count

Customize/Automate FV-UNS
•  Full support of FVX Direct
scripting/automation format read
•  Runs in true batch mode
•  Integrated with AcuReport

Data Access
•  Direct database read
•  Conversion to FV-UNS format
•  Local client/local server
•  Local client/remote server
•  Up to 8 processor parallel
operation


Race Car – Finished Product

AcuSolve Fluid/Structure Interaction
Demo – Yield Sign Flutter

Altair Engineering, Inc.
June 6, 2012


FSI Demo - Overview

•  What you will learn
•  Multiphysics capabilities of AcuSolve
•  P-FSI vs. DC-FSI
•  AcuSolve modeling process
•  Interoperability of AcuSolve with RADIOSS
•  Basic CAD associativity within AcuConsole
•  How to set up multiphysics simulations using AcuConsole


FSI Demo – Supported Physics

•  Multiphysics
•  Rigid Body Dynamics Coupling
•  6-DOF rigid body solver
•  No multi body dynamics

•  Practical Fluid/Structure Interaction (P-FSI)
•  Structural displacement computed by AcuSolve
•  Based on modal superposition
•  Limited to linear structural displacements
•  Supported with RADIOSS, Abaqus, Nastran

•  Directly Coupled Fluid/Structure Interaction (DC-FSI)
•  Codes communicate at run time
•  Loads/displacements exchanged
•  Supported with RADIOSS, Abaqus, MD-Nastran


FSI Demo – Problem Description

•  Road sign flutter under high wind
•  Geometry constructed in SolidWorks
•  Structural model(s) built using HyperMesh
•  CFD model built using AcuConsole
•  Practical Fluid/Structure Interaction (P-FSI) and Directly Coupled Fluid/
Structure Interaction (DC-FSI) technology used


FSI Demo – Results

•  Displacement from P-FSI case


FSI Demo - Results

•  Finished product

CFD and more with Acusolve and HyperWorks

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