Particle-tracing inside a droplet simulation

[Mohamed_Wael]

I have been simulating a 2D particle/droplet motion inside a larger emulsion using Comsol where the flow field inside the emulsion is calculated from a moving mesh laminar flow simulation. my problem is: I always get an undefined variable error " Variable: comp1.w" however this variable is the velocity component in the z-direction! and when I switched the drag force to user-defined I found an option for the flow field in the z-direction. I have attached images for this problem.

 

[Navin A S]

The error message you are receiving is likely due to the fact that Comsol doesn't recognize the variable "comp1.w" as a valid velocity component in the z-direction. You can solve this problem by switching the drag force to a user-defined option, which will allow you to specify the velocity component in the z-direction. Once you have done this, you should be able to successfully run your simulation without any errors.