3D Helmholtz Structure

Numerical methods and mathematical models of Elmer
raback
Site Admin
Posts: 3225
Joined: 22 Aug 2009, 11:57
Antispam: Yes
Location: Espoo, Finland
Contact:

Re: 3D Helmholtz Structure

Post by 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

pilafa
Posts: 56
Joined: 17 Apr 2012, 00:33
Antispam: Yes
Location: Barcelona

Re: 3D Helmholtz Structure

Post by 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

raback
Site Admin
Posts: 3225
Joined: 22 Aug 2009, 11:57
Antispam: Yes
Location: Espoo, Finland
Contact:

Re: 3D Helmholtz Structure

Post by 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

Post Reply