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two way FSI with prescribed displacement causing gaps in mesh
Posted 18 feb 2018, 20:19 GMT-5 Structural & Acoustics, Fluid & Heat, Computational Fluid Dynamics (CFD) Version 5.3 2 Replies
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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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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
-------------------Henrik Sönnerlind
COMSOL
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Thanks Henrik, that fixed the problem.