I am using the laminar fluid interface together with the particle tracing interface in COMSOL. I was able to track my particle in the system. But now I want to find the velocity of the fluid near the particle when the particle moves through the fluid. Streamlines would be fine also. But is seems that I am not able to do this and the streamlines do not change. Any suggestions how I can improve this of find the fluid velocity near the particle?
I have illustrted this in the picture below.
Although the link given below does not specifically deal with velocity measurements, it gives an idea about using Probes to generate data for the variable you wish to evaluate for and monitor during the solution process.
https://www.comsol.co.in/blogs/probing-your-simulation-results/
To do that, you need to do the two phase flow simulation, or at least put your particles into your CFD model. Not just use particle tracing with the given fluid flow field.
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