Dear all,
I've been trying to import a 2D geometry to COMSOL Multiphysics, in order to perform an eigenvalue analysis of a periodic structure, following the Bloch theorem periodicity.
The structure basically is a sinusoidal square lattice (as presented on the figure in annex), which is generated in SolidWorks and exported as a DXF and opened in COMSOL. However, when I import the geometry, several actions need to be done in order to set it for the simulation. For example, due to the existence of curves, many edges are partitioned, which causes problems in meshing the domain.
I wonder if there would be another way to do the geometry import process without having to modify the structure each time since there is an intention to automatize this process. Creating this geometry inside COMSOL is complicated because the software has a limitation on CAD features. Trying to connect directly COMSOL with SolidWorks would be a possibility, however, it only allows us to analyze 3D geometries, and in my case, the intention is to analyze a 2D problem.
Did someone worked out with that before and could provide some insights?
Best regards,
Victor Gasparetto
For me better way is to import the 3D file (simply extrude the 2D geometry), and then take the cross section inside COMSOL. Disadvantage is that you will have to make two geometries inside COMSOL.
Noman Iqbal thank you for your answer. So, by using the cross section of the 3D geometry will I still be able to impose the periodic condition of the edges of my plane geometry? Because I noticed that, in order to impose the periodic condition on a 3D geometry, it is necessary to apply that boundary condition on a face instead of an edge entity.
From cross section u will be getting the 2D geometry, every operation u were performing in ur previous simulations u can do those here. Difference is that u are not importing the 2d geom but making in within COMSOL. U just have to import the 3d geom (not use in any physics).
Make model1 and model2. In model one (3d) import ur geom. In model2 (2d) or make the geom by taking the cross section of geom1. (Model could be comp in ur .mph file like comp1 and comp2).
Model1 just have the 3d geom. All the necessary physics n studies will be for model2. But make sure to have both models in same file.
If u dont want two models in same file then save the 2d geom and import that in other .mph file.
Hope this helps.
Noman
Dear Victor,
COMSOL has several tools to clean the geometry after the last union. One you can apply is joining vertex with a continuous tangent below a given value i.e. whatever below your crosssection angle. In any case, it seems like a very simple geometry that can be easily created inside COMSOL (using a model method or the JAVA API). I can try to help you with that if needed.
Kind regards,
Julian
An example of a geometry created with model methods can be found here: https://www.comsol.com/blogs/how-to-create-a-randomized-geometry-using-model-methods/
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