Yes the EM-VOF method can be a suitable choice for simulating the mixing of three phases. It is commonly used for multiphase flow simulations, and it can handle interfaces between different phases, such as the liquid CO2, air, and particles in your case.
To solve the Courant number issue, you can try the following steps: Decrease the time step size, Increase the mesh resolution, and also check physical parameters and boundary conditions
Hope this answer your question.
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