2006 Abaqus FSI post-processing by CEI EnSight

Visualization of Coupled FEA, CFD and Multi-body Dynamics

Simulations using EnSight

Darin McKinnisComputational Engineering International (CEI)

Clinton StoneMSC-Africa Simulating Reality (Pty) Ltd

Paul Adams Scientific Visualization Lead

ERDC MSRC - Vicksburg, MS

Visualization of Coupled FEA, CFD and Multi-body Dynamics

Simulations using EnSight

Darin McKinnisComputational Engineering International (CEI)

Clinton StoneMSC-Africa Simulating Reality (Pty) Ltd

Paul Adams Scientific Visualization Lead

ERDC MSRC - Vicksburg, MS

• Most CFD codes already handle basic FSI• Normally limited to Rigid body boundary motion• Mostly limited to rigid body motion by a prescribed

function• Some packages include a 6DOF dynamics model to handle

problems like store separation• Normally FSI requires extensive amounts of remeshing

• Most FEA codes already handle basic FSI• Usually very limited in CFD ability (e.g.. Laminar Flow Only)• Usually limited to relatively small structural displacements• Primarily used to add effects of fluid mass/inertia on

structural dynamics response (e.g. Seismic analysis of dams)

Description of CAE Coupling Technology

Current CFD Implementation

Moving rigid walls with remeshing

Moving rigid walls with overlapping meshes & 6DOF dynamics model

Description of certain FSI Technology

• Certain codes are dedicated to handle FSI• E.g. MSC.Dytran, LS-Dyna, AutoDyn• Very capable in terms of non-linear structural dynamics• Normally limited in terms of CFD capability• Explicit codes are mainly suited to

short-duration events• Normally use the ALE approach where

the structure & fluid share common interface nodes

• Euler mesh is “morphed” as the structure deforms• Limited to mostly relatively small displacements• Focus is usually on the

structural response• Some codes have more powerful

General 3D Coupling

• Despite the progress already made in FSI & FEA/MDB coupling, the tools are either rather limited or very specialized for specific applications• Short Duration, Airbags, explosions, bird-strike, linear

flexibility…

• A growing need exists to make multi-physics coupling more general and powerful

• One solution is to combine the strengths of multiple CAE tools using technology such as MpCCI

Description of CAE Coupling Technology

MpCCI: Description and Motivation

Mesh-based parallel Code Coupling Interface. • Handles data communication between two or more

simulation codes• Supports non-matching grids and handles data

interpolation (conservative and non-conservative) between the grids.

• Supports parallelization of the codes.• Includes an intuitive GUI for setup of the simulation• Developed by:

Fraunhofer Institute for Algorithms and Scientific Computing SCAI

• See: http://www.mpcci.org.

MpCCI: Description and Motivation

• Current MpCCI Technology Partners• MSC.Software• CD-adapco• Abaqus• Ansys• Fluent• CEI (EnSight)• Others…

• MpCCI Code Support (v 3.0.x)ABAQUS (V 3.0.3 Dec 2004)ANSYS (V 3.0.3 Dec 2004)Fluent (V 3.0.3 Dec 2004)StarCD (V 3.0.3 Dec 2004)Permas (V 3.0.4 planned April 2005)RadTherm (V 3.0.4 planned April 2005)CFX (V 3.0.5 planned later 2005)Marc & Nastran (V 3.0.5 planned Q3 2005)

Other MpCCI Technology Projects

Damping of piezo elements StarCD–ANSYS

Aero-elastic in aircraft design Flower–Nastran

Cabin acoustic in aircraft ACTI3S–Nastran

Polymer mixers StarCD–Permas

Airbag gas generator simulations CFX–Marc

Aquaplaning computations Numeca–Marc

Vibration in pipeline systems Fluent–ANSYS

Rubber gaskets Fluent–ANSYS/ ABAQUS

Wind loads in civil engineering CFX–InHouse

Aerodynamics in automotive design StarCD–Nastran/ ABAQUS

Biomechanical simulations StarCD–Mecano

Presentation Overview

• Introduction & Trends in the CAE Industry

• Discussion of CAE Coupling Technologies• Fluid Structure Interaction (FSI)• Multibody Dynamics & Finite Element Analysis (MBD /

FEA)• Mesh-based parallel Code Coupling Interface (MpCCI)

• Postprocessing Challenges• Technology Demonstrator Projects• Conclusion

Postprocessing Challenges

• Any form of multi-code coupled simulation has problems in terms of results visualization

• Each CAE package is designed to only postprocess its specific results

• Viewing the different result domains separately significantly reduces the engineering value of the simulation

• Often sequentially coupled solutions are conducted with very different time scales

Postprocessing Challenges

• EnSight is unique in its ability to postprocess coupled simulation results.

• These can either be:• Directly coupled with co-simulation or MpCCI• Sequentially coupled using tools like iSight-FD or Fiper• Manually coupled solutions using loads transfer• Decoupled simulations of separate physics portions of a

problem

• Ensight features required for this are:• Multi-code readers• Results Timeline manipulation

• Keyframing & Viewport Tracking • Multiple Case Support• Case Mapping (Pressure from CFD to FEA)• Global model repositioning (Frame Mode)

Presentation Overview

• Introduction & Trends in the CAE Industry

• Discussion of CAE Coupling Technologies• Fluid Structure Interaction (FSI)• Multibody Dynamics & Finite Element Analysis (MBD /

FEA)• Mesh-based parallel Code Coupling Interface (MpCCI)

• Postprocessing Challenges• Technology Demonstrator Projects• Conclusion

Technology Demonstrators

• The following examples will illustrate the use of EnSight to postprocess coupled simulations

• These examples highlight all of the methods previously discussed for coupling


Sequentially Coupled MBD & FEA simulation

Helicopter Crash Investigation


Sequentially Coupled MBD & FEA simulation

Pickup Truck Crash Investigation


Sequentially Coupled MBD & CFD simulation

Aircraft flap & air-brake deployment

Coupled CFD & FEA simulation using MpCCI


Automotive Manifold



Flexible Membrane Flutter



Biomedical Heart-Valve

Technology DemonstratorsBi-Metallic Strip Flow Restrictor



Co-Simulation coupling with MBD & CFD simulation

Dragline Dynamics & Digging

MSC.ADAMS solves the dynamics of the system

MSC.Dytran solves to system / soil interaction


Co-Simulation coupling with MBD & Non-linear FEA

Bungee Jumper

Technology DemonstratorsSloshing Tank Test rig

Co-Simulation coupling with MBD & CFD

Technology Demonstrators - Povray !Sloshing Tank Test rig

Co-Simulation coupling with MBD & CFD

Technology Demonstrators - Povray !Flow around bridge footing

Flow simulation vs experimental results

2006 Abaqus FSI post-processing by CEI EnSight

Technology

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