3D Helmholtz Structure

Numerical methods and mathematical models of Elmer

Re: 3D Helmholtz Structure

Postby raback » 17 Mar 2017, 00:06

Hi

Hierarchical would be one-way coupling.

The simulation as implemented is missing the effect of the fluid to the resonating structure.

-Peter
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Re: 3D Helmholtz Structure

Postby pilafa » 18 Mar 2017, 00:34

Hi Peter,

Ok, I see.

How to know if two physics in Elmer have a Hierarchical coupling? Or coupling is always Hierarchical ??

Thanks again.

PL
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Re: 3D Helmholtz Structure

Postby raback » 20 Mar 2017, 11:37

Hi

Most equations don't know of the other ones unless you specify the coupling in some way, often as a r.h.s. term. You can always iterate any loose coupling and most often obtain convergence.

In this case the elasticity equation does not know about the additional pressure caused by the resistance of the fluid. This should be seen as a additional boundary force equivalent to pressure. That coupling should work well when the effect of fluid is small but requires more advanced methods when not.

-Peter
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