I am studying modified Ozawa method in comsol with matlab live link. I did all the simulations, but could not found the results for my channel flow. There is one paragraph in the paper, which in doubt for me. Please, can anyone check my simulation (mph file and matlab files) and the highlighted paragraph to explain it, why I cannot get the results. Thank you so much.
Hello Bacha Munir ,
First, does your model reach a solution in COMSOL without the Ozawa modification?
Unfortunately I have not used the MATLAB Live Link, but looking at the paragraph it simply appears to use MATLAB as the Ozawa solver, printing the iteration and the errors.
Of course, if the problem is ill-posed, there may not be a solution. My first suggestion would always be to go back and check your boundary conditions are correctly defined. Next, check the mesh quality (physics-dependent usually works well, but sometimes you need a custom mesh). Then, if you have sensible starting values, include them.
Normally you can then adjust the parameters in the solver (e.g., adjust number of iterations, damping factors, etc.).
What are your boundary conditions for the inlet and outlet. I have found the solver to be very sensitive to the type of BC. Maybe my mathematics knowledge is just insufficient. For example, if both are defined as pressure (for a pressure-driven fluidic flow), it will not solve. Yet, for example, convert the outlet to a flow rate (estimated by the Hagen–Poiseuille equation) and it will solve.
Yes dear Jules Lloyd Hammond . I am agree with you. Actually, I am solving my weak form pdes of naveir stokes equation for bubble motion. For that i have problem in my inlet and outlet boundary conditions, which I really do not how to implement there, because we dont have these nodes. So i used dirichlet BCs for this purpose. But the results were not satisfactory. Now I want to test and clarify my BCs and equations using modified OZAWA method. But here the setting in COMSOL, i cannot understand, especially the coefficient for PDEs used there. Therefore, if you please, give me some valubel suggissions, so that I also clarify my BCs and weak form PDEs. Thanks for your detail reply.
My matlab live link with COMSOL is active, as i checked for geometry and mesh. Used mphgeom(Uaz2) to check for geometry and mphmesh(Uza2) for mesh confirmation. But other results cannot.
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