I am not familiar with FLUENT and CFX but I can confirm that COMSOL is one great solution - if not the best - to simulate multiple physics phenomenon such as electromagneto/fluidics.

Moreover, the community is big so a lot of questions and tutorials exists.

It is relatively simple to use: create your geometry, add your physics (electromagnetic and hydrodynamic in your case), add the conditions and launch the simulation.

Hope it helps choosing your solution.

Best,

Théo

Yes, comsol is the best package. But you should take care of your boundary conditions, your scheeming and do not forget to compare your results.

Thank You Theo, and Thank you Joseph