Dear all,

I have an acoustofluidic problem in which I use acoustic streaming micro-vortices to trap the cells, and I'm still trying to complete its modeling on COMSOL.

Recently, I encountered a problem in particle tracing physics and faced with an error "some particles have been removed from the simulation because of a failure in finding the wall intersection", that I could not fixed it by changing the mesh size, reducing the time step and also increasing the number of wall interactions per time step.

How can I overcome this problem? I would be grateful if anyone could help me, Any help would be extremely appreciated.