Can I simulate more than one stl geometry/ an assmebly with the 'createpde' function?

Question

Praise Nwachukwu 2024-5-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2119681-can-i-simulate-more-than-one-stl-geometry-an-assmebly-with-the-createpde-function

回答： R 2024-5-17

Hello, so I want to run a thermal (transient) thermal simulation on a CAD model.

I have imported the CAD model, which consists of distinct bodies that are in both thermal contact and physical contact (like a cuboid, inside another cubiod). I want to use the createpde fucntion to carryout the simulation.

This is an example of my code:

xxChamber = createpde('thermal', 'transient');
importGeometry(xxChamber, 'Outermost component v.stl')
Error using importGeometry (line 34)
Invalid argument at position 1. File Outermost component v.stl does not exist.

Error in pde.EquationModel/importGeometry (line 46)
        gm = importGeometry(geofilename,varargin{:});
pdegplot(xxChamber, "FaceLabels","on")

Now this works quite alright, but once I begin to add the second chamber, by typing in

importGeometry (hydrolysisChamber, "middle v2.stl")

The code gives an error saying ' Assemblies of more than one geometric model not supported.

What can I do to solve this problem?

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Answer 1

R 2024-5-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2119681-can-i-simulate-more-than-one-stl-geometry-an-assmebly-with-the-createpde-function#answer_1459336

This is likely due to the limitations of importGeometry:

https://www.mathworks.com/help/pde/ug/pde.pdemodel.importgeometry.html#mw_4e5d76e1-596e-44fd-b2cd-767045e9c5c6

A possible workaround to achieve the functionality you have described would be to, instead of exporting an .STL file from your third party tool, export a mesh and then try to import it to a geometry using geometryFromMesh:

https://www.mathworks.com/help/pde/ug/pde.pdemodel.geometryfrommesh.html

If there are multiple domains in your geometry (e.g. a cuboid inside a cuboid with different properties), you will need to make sure that the exported mesh data that you are trying to import into MATLAB also contains mappings of the nodes to different regions. See ElementIDtoRegionID input for geometryFromMesh:

https://www.mathworks.com/help/pde/ug/pde.pdemodel.geometryfrommesh.html#d120e49000