Apply Boundary Condition to Nodes

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Vitaly Kheyfets 2017-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/332651-apply-boundary-condition-to-nodes

评论： Jide Kolade 2018-9-13

Hello,

I imported a mesh from another software (node coordinates and connectivity) using the geometryFromMesh function.

However, Matlab broke the 3D geometry into some very strange faces, which makes applying boundary conditions to the faces very difficult.

Is there a way to give a list of nodes as a boundary condition to solve a PDE model?

Or, is there a way to assign faces to a 3D model based on surface nodes?

Thank You,

Vitaly

回答（1 个）

KSSV 2017-3-30

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https://ww2.mathworks.cn/matlabcentral/answers/332651-apply-boundary-condition-to-nodes#answer_260953

Use this function https://in.mathworks.com/matlabcentral/fileexchange/32719-postprocessing-in-fem?focused=6861378&tab=function to plot mesh. You can extract the boundary nodes, but it depends on how your mesh is.

Unfortunately, I ended up doing a work-around. Matlab has two major limitations: (1) it appears that boundary conditions can only be applied to geometry faces instead of directly on the mesh (which would be so easier) and (2) it kind of arbitrarily assigns face ids and it's hard to figure out what you're looking at.

Sorry couldn't be more help. If you figure out the answer, please let me know.

Thanks,

Vitaly