Download - A Modular Simulation Environment for Fluid-Structure Interactions · 2008. 10. 22. · FSI*ce Solver multigrid cycles multigrid functionality restrict central mesh extended data mapping

Herrsching, 30.9.2008, Miriam Mehl

FSI∗ceA Modular Simulation Environment

for Fluid-Structure Interactions

Miriam MehlDepartment of Computer Science, TU München


Outline

concept of FSI*cedata transfer for non-matching grids

octree neighboorhood search

coupling controlmultigridfurther potential


Plug-and-Play for FSI

Fluid Solver

Structure Solver

MpCCI

coupling strategydata mapping



Fluid Solver

Structure Solver

MpCCI



Fluid Solver

Structure Solver

FSI∗ce

Coupling StrategyCentral Surface Mesh


Data Mapping

• any types of solver grids• tools:

• neighbourhood search• interpolation/projection


Data Mapping

central mesh

octree

grid point triangle +projection


octree depth

time (sec)

nodes

7 0.8 203,9059 4.9 3,288,225

11 48.2 52,662,33713 662.8 842,687,105

Data Mapping – Octree Generation

octree generation measured on a Pentium 4 2.4 GHz processor with 512 kB cache


17.4 sec128,00051214.3 sec32,00051210.1 sec8,000512

2.6 sec8,000256runtime# triang.Cart.res.

neighbourhood search measured on a Pentium M 1.6 GHz processor with 2048 kB cache

Data Mapping – Neighbourhood Search


Coupling Control

explicit/implicit

subcycling

next: multigrid


Coupling Control – Multigrid

solve fluidexchange datasolve structureexchange data

compute residualrestrict residualsolve coarse



FSI*ce Solvermultigrid cycles multigrid functionalityrestrict central mesh extended data mapping

setup-phase for central mesh hierarchy



benefits of multigrid:• Bijl, van Zuijlen, Boscher, ECCOMAS CFD 2006:

eff. gain: factor 101D linear piston problemtwo-grid solver, coarsening in the fluid only


Central Mesh – Further Potential

Source: Mike R. Ross, PhD thesis, 2006

• third numerical component: the wet surfaceLLM transient method (Park, Felippa, Ohayon, 2001,

Ross, 2006)


stableparallel





Vierendeels, LNCSE 53, Springer, 2006.

fluid solver

struct. reduced

fluid reduced

struct. solver

FSI*ce

1

3

4

2reduced order models

implicit couplingblack box solvershigh efficiency


Conclusion

flexibility

solvers, coupling strategy

enhanced coupling strategies

multigrid

interface equation

reduced order models

Download - A Modular Simulation Environment for Fluid-Structure Interactions · 2008. 10. 22. · FSI*ce Solver multigrid cycles multigrid functionality restrict central mesh extended data mapping

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