As far as I know, the procedure is exactly the same (of course for a 3D case you should provide the three components of the position and the velocity vectors). In my case I wanted to simulate one single particle falling into a static liquid, and it was simple. For example in one of the cases I simulated, the particle_input file contained just the following line:

5.0000 148.0000 5.0000 0.3625E00 2.164 0 0 0

in which the first three number defined the position, 0.3625 was the particle diameter, 2.164 the particle density and the final three 0 are the velocity components (in my case the particle was at rest).

The use of the particle_input file is convenient if you plan to simulate a case with a limited number of particles, as you should provide particles' infos for every single particle.

In the case of a 3D fluidized bed, for example, you can turn on the automatic particle configuration (GENER_PART_CONFIG = .T.), which, given particle diameters, void fraction and the coordinates of the domain in which the particles are stored initially, generates automatically the particle number and positions (see pag. 91 of the Readme.pdf file).

Cheers

Dear Fabio

Thanks, your answer is quite helpful for me. I used the "GENER_PART_CONFIG" statement and mfix is running now.

However, I want to check simulation results of my own code with mfix and I hope I can use your experience in the future.

Regards,