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two way FSI with prescribed displacement causing gaps in mesh

Posted 18.02.2018, 20:19 GMT-5 Structural & Acoustics, Fluid & Heat, Computational Fluid Dynamics (CFD) Version 5.3 2 Replies

Dan Bence
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I am experimenting with a very simple two way FSI. A solid square is moved through some air. I place a prescribed displacement on the bottom of the square. What seems to happen is an actual gap in the mesh appears at the bottom of the mesh at the prescribed displacement ( dont mean a stretched mesh)

You can see the gap as a white section in the default view and it is obvious in the mesh plot (both images attached).

Is a prescribed displacement illegal in a two way FSI on the boundary of the solid/liquid interface ? If so, how does one force a movement of one section of a solid ?

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2 Replies Last Post 27.02.2018, 04:45 GMT-5
Henrik Sönnerlind COMSOL Employee

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Posted: 6 years ago 20.02.2018, 02:13 GMT-5

Hi Dan,

The Prescribed Displacement overrides the Fluid-Solid Interface Boundary, in which the mesh deformation is tied to the solid deformation. You need to add an explicit Prescribed Mesh Displacement, and set the mesh deformation to the same prescribed value as the displacement.

Regards,

Henrik

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Henrik Sönnerlind
COMSOL
Hi Dan, The **Prescribed Displacement** overrides the **Fluid-Solid Interface Boundary**, in which the mesh deformation is tied to the solid deformation. You need to add an explicit **Prescribed Mesh Displacement**, and set the mesh deformation to the same prescribed value as the displacement. Regards, Henrik
Dan Bence
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Posted: 6 years ago 27.02.2018, 04:45 GMT-5

Thanks Henrik, that fixed the problem.

Thanks Henrik, that fixed the problem.

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