Please, can some one explain me a little (idea ), how to implement (equation 10 in the attached paper) as a weak constraint directly on an elliptical shape bubble (air-liquid interface) in COMSOL 5.3a?. Your help will be appreciated. Thank you.
Dear Bacha Munir,
Enable the Equation View from the Model Builder > Go to the air-liquid interface > Click on the Equation View inside it > Find Constraints > Add your expression.
Dear Marwan Nafea thanks for your reply. Its okay. But in the paper, my equation has three variables and i need to solve three weak form PDEs i.e, for u, v and p in comsol. I wrote my pde in weak form, has three equations for x, y directions and one continuity equation. I wrote equation 10 (in paper), also component wise. So for each equation to R.H.S, as I know has one weak constraint. Now, If I am correct, for each constraint I need to specify boundary, which in my case is elliptical shape bubble. Now, My problem is, how I can select one boundary three times, as I have three weak constraints. There is no flux from the air to fluid.
Dear Marwan Nafea, i am using the idea as used here
https://cn.comsol.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/
and
Lab 1: Equation-based Modeling in Comsol Multiphysics. you can search on the web. Thank you.
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