[Subodh21]

Hi,
I am new to FSI and recently started using solids4Foam and working on a fluid-structure interaction (FSI) problem, specifically the benchmark case "FSI between an Elastic Object and Laminar Incompressible Flow" by Turek and Hron (2006). This benchmark problem is featured in one of the solids4Foam tutorials, and I have successfully managed to run the simulation.

However, during post-processing, I observed that only the fluid mesh appears to be moving, while the solid mesh remains static. Upon further investigation, I discovered that the solid mesh is indeed set as static, while the fluid mesh is updated dynamically. The relevant configuration for the solid mesh is as follows:

FoamFile
{
version 2.0;
format ascii;
class dictionary;
object dynamicMeshDict;
}

// ************************************************** *********************** //

dynamicFvMesh staticFvMesh;

// ************************************************** *********************** //


I am trying to understand the reasoning behind having a static solid mesh in an FSI problem. Despite the solid mesh being static, I can see the interface moving. Could someone please help clarify why the solid mesh is considered static in this setup?

Thanks in advance!

[bigphil]

Hi Subodh,

To show the deformed solid, you need to use the "Warp by Vector" filter in ParaView with the displacement field (D or pointD).

In this case, the solid model employs a total Lagrangian (static mesh) approach but calculates the true deformed geometry (which the fluid sees).

Philip

[Subodh21]

Thanks I am able to run the simultion, but when i compare my result to the HuronTurek FSI case, I am finding the drag and lift values are significantly low, I have checked the material properties in both fluid and solid and they are matching , also I activated g in the solid. Is there anything I could be missing?

[bigphil]

Originally Posted by Subodh21

Thanks I am able to run the simultion, but when i compare my result to the HuronTurek FSI case, I am finding the drag and lift values are significantly low, I have checked the material properties in both fluid and solid and they are matching , also I activated g in the solid. Is there anything I could be missing?

Which versions of solids4foam and OpenFOAM are you using? Did you try solids4foam-v2.1 and OpenFOAM-v2312?

[Subodh21]

I am using openFOAM9 and solid4Foamv2.1.

[Subodh21]

This is the plot for my forces.

[Subodh21]

Originally Posted by bigphil

Which versions of solids4foam and OpenFOAM are you using? Did you try solids4foam-v2.1 and OpenFOAM-v2312?

Btw my friend who is using the version you suggested is seeing same issue of low drag and lift values.