Hello,
I wish to solve the weak N-S eq (based on PDE's) in COMSOL.
By default, COMSOL applies the equation in all domain but I want to solve it in each mesh (not all domain).
I want to do this in order to add different porosity in each CFD mesh.
Is it possible?
Thanks in advance.
Hi Armin Ramezanzad
If I understand correctly, you divided your simulation domain into four regions and tried to solve a PDE in each one separately.
From a numerical perspective, this might give you inaccurate results since FEM evaluates the function at the nodes and estimates the solution between them using the sum of unique basis set. If the points are closer to each other (denser mesh), the simulation is likely to converge faster with reliable results.
I recommend the use of geometrical properties instead. You can divide your domain into many parts in each direction using the "Layers" tab in the geometry definition. Then, you can select each region and solve your PDE separately or solve all of them at once using proper boundary values at the interfaces.
https://www.comsol.com/forum/thread/135183/how-do-i-use-layers-in-geometry-definition
To anyone encountering a similar question:
YES! IT IS POSSIBLE!
just use an interpolation function for each parameter you want to ask COMSOL to solve the N-S equation. based on the coordinates of each mesh's centroid and regardless of the mesh type, COMSOL solves the given equation for each mesh.
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