As it has known the Dirichlet boundary condition is suitable for no-slip wall boundary for the stream function in COMSOL. I need to ask if I have an inlet and outlet I need to look for another boundary to make the stream function fit to the streamlines because using the Dirichlet boundary with these locations gives an inaccurate profile of stream function? Any idea?
When setting up fluid flow simulations, we typically focus on a single (possibly a few) components in a larger system, such as a pump or sedimentation tank in a water treatment plant. Naturally, this raises a question: At what distance can we apply boundary conditions without interfering with the process? In this blog post, we look at the effects of the proximity of inlet and outlet boundaries for interior and exterior flows of a homogeneous fluid with negligible compressibility.
In your case, I also think the following link might be useful to you: https://www.comsol.com/blogs/how-to-place-inlet-and-outlet-boundary-conditions-in-cfd-simulations/
Have a look at https://www.comsol.com/blogs/how-to-place-inlet-and-outlet-boundary-conditions-in-cfd-simulations/ and Article Analysis of internal flow and outlet velocity characteristic...
When setting up fluid flow simulations, we typically focus on a single (possibly a few) components in a larger system, such as a pump or sedimentation tank in a water treatment plant. Naturally, this raises a question: At what distance can we apply boundary conditions without interfering with the process? In this blog post, we look at the effects of the proximity of inlet and outlet boundaries for interior and exterior flows of a homogeneous fluid with negligible compressibility.
In your case, I also think the following link might be useful to you: https://www.comsol.com/blogs/how-to-place-inlet-and-outlet-boundary-conditions-in-cfd-simulations/
Dear Muhammad Ali & Shahida Anusha Siddiqui thanks for the answer. The information you provided differs from the topic I asked. To be more specific, I need to know how I can make streamlines in Comsol coincide with stream function at inlet and outlet boundaries? As seen from the figures below there is some discrepancies between streamlines and stream function?
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