1. Dr. Ulrich Heck1 Structural Analysis and Fluid Structure Interactions (FSI) using I-deas and ADINA Part II: Fluid Structure Interaction Dr. Ulrich Heck: Dr. Heck Consulting and Engineering This presentation contains animated gifs (PowerPoint 2000 or higher required, full screen presentation) Presented at 2002 PLM Europe Conference in Stuttgart, Oct, 2002 More information about our company and our simulation services: www.dhcae.de

2. Dr. Ulrich Heck2 FLUID-Structure Interactions: Fluid flow causes deformation or movement of structure Moveable or deformable structure effects fluid flow Applications or processes (examples): Biomedical: Artificial heart valves, flow through veins or arteries Automotive: Flow in Pumps, valves, flow around car components Aerospace Flow around missiles, flow around airfoil components Production Injection moulding Dr. Heck Consulting and Engineering

3. Dr. Ulrich Heck3 Dr. Heck Consulting and Engineering Example Modelling Solid region (Membrane) Fluid Region Fluid inlet Fluid outlet In general: Fluid model: tetrahedral elements Solid Model: various element types possible (shell, various 2d or 3d-solid)

4. Dr. Ulrich Heck4 Integration of ADINA in I-deas already presented by A. Hodgson Dr. Heck Consulting and Engineering

5. Dr. Ulrich Heck5 Some special treatments in I-deas for FSI-modelling Two separate FE-models: solid model and fluid model Definition of elements with special properties (e.g. material labels) or boundary conditions at the FSI boundaries and walls I-deas-ADINA interface translates and prepares the models Post-processing is possible in I-deas for both models separately Investigation of solid and fluid model: ADINA post-processing Dr. Heck Consulting and Engineering

6. Dr. Ulrich Heck6 Validation of ADINA FSI:Tube with elastic wall wall properties: thickness h, Youngs Modulus E tube/flow properties: density, radius R C 0 = E h 2 R wave propagation velocity: modelling: transient FSI ADINA managed to determine the exact wave propagation velocity ! Dr. Heck Consulting and Engineering

7. Dr. Ulrich Heck7 1.Example: Valve model Flow around body Membrane fixed in valve close to fluid outlet pressure at fluid inlet velocity in tube dynamic pressure deformation of membrane resistance of valve Dr. Heck Consulting and Engineering

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10. Dr. Ulrich Heck10 2. Example: Flexible tube compression Flow through body Tube with elastic wall Increasing pressure load Contact region Dr. Heck Consulting and Engineering

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12. Dr. Ulrich Heck12 3. Example: spring/mass analysis, damped by fluid viscosity Transient analysis Structural model: Shell elements Increasing fluid viscosity: Increasing damping massspring Fluid with viscosity 1.Step deflection 2.Step spring back Dr. Heck Consulting and Engineering

13. Dr. Ulrich Heck13 Dr. Heck Consulting and Engineering Walls Deflected spring

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15. Dr. Ulrich Heck15 Conclusions ADINA is a very powerful tool to solve FSI problems ADINA is fully integrated in I-deas Use of I-deas meshing and modelling capabilities Requirement for users: Experience in Structural FEA and CFD is important for modelling and interpretation of results Dr. Heck Consulting and Engineering www.dhcae.de Dr. Heck Consulting and Engineering www.c-a-e.com