Boundary condition for multidomain geometry
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I want to solve my PDE problem on multidomain geometry. I imported mesh definition to Matlab and I tried to specify multidomain geometry using geometryFromMesh(model,nodes,elements,ElementIDToRegionID) I get the geometry with appropriate number of cells, but several faces that I don't understand where from they comes. In particular, my geometry has three cells/materials and six material interfaces (material1/material2, material1/material3, material2/material3, material1/exterior, material2/exterior and material3/exterior). However, Matlab somehow defines 39 faces.
I would like to know:
- How Matlab define those faces?
- How I can get info which nodes are in any particular face?
- How to force a Matlab to define faces reasonably for my problem (e.g. on different material interface), so that I can specify boundary conditions?
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Answers (3)
Ravi Kumar
on 21 May 2019
Hi Urban,
Would you be able to share your code and data? Geometric faces are identified by analyzing how drastic the normal changes between adjacent element facets.
You can find nodes associated with a face using findNodes(model.Mesh,'region','Face',fID) function.
Regards,
Ravi
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Urban Simoncic
on 21 May 2019
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Ravi Kumar
on 21 May 2019
Currenlty, finding the required faces might be the only option. An example data would help me figure out if there are any workaround.
Urban Simoncic
on 24 May 2019
1 Comment
Ravi Kumar
on 24 May 2019
You might want to refine the mesh that you used in geometryFromMesh call. When I plot the geometry, there seems to a bunch of spurious faces at the bottom as shown in the figure below. These can lead to problem during analysis.
![gfmImport.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/220899/gfmImport.png)
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