I am working on the Marangoni convection in liquids using COMSOL Multi-physics.
- In my model, I need to impose a shear force on the liquid interface. I studied the "Marangoni Convection" example which is provided on the website.
- They used weak contribution to express the shear force on the interface as follows: test(u)*(gamma*Tx) This force acts in x direction only.
- My model contains a bubble (curved surface) with temperature gradient in all directions.
- So, how could I impose 3D boundary condition on the interface ?
Joseph Dgheim
I think you need to put your boundary conditions in its general form and not in cartesian coordinates (gradient form). Write your equation in the global expression.
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Ahmed Mohamed Diaa
Thanks Dr. Dgheim for your answer.
However, I have two problems to be solved, first : How to add a vector form expression in COMSOL Mutliphysics (particularly in weak expression)?
Second: I could not find any form of the 3D shear force.
Regards,
Ahmed
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Gerd Mutschke
Dear Mr. Diaa,
did you succeed meanwhile?
I think you can simply set your surface tension (a function depending on T) in the multiphysics part of the model.
Regards, G.Mutschke
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