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A Modular and Efficient Simulation Environment for Fluid-Structure Interactions

A Modular and Efficient Simulation Environment for Fluid-Structure Interactions. Miriam Mehl Bernhard Gatzhammer Department of Computer Science, TU München. Outline. no fluid solver details FSI  ce motivation application programming interface modules data transfer

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A Modular and Efficient Simulation Environment for Fluid-Structure Interactions

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  1. A Modular and EfficientSimulation Environment for Fluid-Structure Interactions Miriam Mehl Bernhard Gatzhammer Department of Computer Science, TU München

  2. Outline • no fluid solver details • FSIce • motivation • application programming interface • modules • data transfer • coupling strategies • numerical results

  3. Plug-and-Play for FSI MpCCI DataMapping Coupling Strategy Fluid Solver Structure Solver

  4. Plug-and-Play for FSI MpCCI Fluid Solver Structure Solver

  5. Plug-and-Play for FSI Coupling Strategy FSIce Central Surface Mesh Fluid Solver Structure Solver

  6. FSIce – Application Programming Interface FSI_Init () FSI_Data_exchange () FSI_Finalize () FSI_Is_running () FSI_Is_new_interface_values () FSI_Is_implicit_converged () Fluid Solver

  7. FSIce – Application Programming Interface while (more time steps) Set time step length Compute values of next time step Store values of next time step end while Fluid Solver

  8. FSIce – Application Programing Interface while (more time steps) Read coupling data from com.mesh Set time step length Compute values of next time step Write coupling data to com.mesh Store values of next time step end while Fluid Solver

  9. FSIce – Application Programing Interface FSI_Init () while (more time steps) Read coupling data from com.mesh Set time step length Compute values of next time step Write coupling data to com.mesh FSI_Data_exchange () Store values of next time step end while FSI_Finalize () Fluid Solver

  10. FSIce – Application Programing Interface FSI_Init () while (FSI_Is_running()) if (FSI_Is_new_interface_values()) Read coupling data from com.mesh Set time step length Compute values of next time step Write coupling data to com. mesh FSI_Data_exchange () if (FSI_Is_implicit_converged()) Store values of next time step end while FSI_Finalize () Fluid Solver

  11. FSIce – Modules

  12. FSIce – Data Transfer How to map data from solver mesh to coupling mesh ? • Octree for efficient neighbour search • Some projection / interpolation included • Custom interpolations possible • Provided to user in package FSItools

  13. FSIce – Coupling Strategies • Explicit (weak) • Implicit (strong) • Subcycling • Pre-computations • Many others possible: just extend supervisor

  14. Numerical Results – Implicit vs. Explicit

  15. Numerical Results

  16. Cart.res. # triang. runtime 256 8,000 2.6 sec 512 8,000 10.1 sec 512 32,000 14.3 sec 512 128,000 17.4 sec Numerical Results – Data Mapping neighbourhood search measured on a Pentium M 1.6 GHz processor with 2048 kB cache

  17. Conclusion • enhancements ofFSI*ce • modular structure  extendability, flexibility • integration of various components • first examples computed • future: more solvers, more coupling strategies

  18. Thank you for your attention!

  19. FSIce – Application Programing Interface Future goal: Multigrid • Multilevel coupling mesh • Multigrid scheme controlled from coupling supervisor • Allows V, W, ... schemes without modifying solvers Fluid Solver

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