Reply To: Divergence detected during single particle deposition analysis

[Diego Fernando Garcia Gonzalez]

 

Hi Rob.

 

I have experience using the Overset Mesh Method and I’ve always tried, if possible, to have a ratio of 1:2 or even 1:4 between the background cell size and the overset zone cells. I also execute different treatments for the overset mesh through TUI, so I always seek to avoid the appearance of orphan cells. The only time I expect orphan cells to appear is when the particle is near the bottom of the tank. Regarding resolving time correctly, I hope that the particle can reach a terminal velocity of 5 cm/s… from this I can determine the must time steps to cross a cell in my domain (background). I am using a time step of 1e-4 even less, so if the particle reaches terminal velocity, it takes 21 time steps to cross a domain cell. trust me, I have already I’ve tried many things, from modifying the mesh, the time steps to the solution methods and many other things… but nothing has worked when I define small mass values in the properties of the SixDOF solver .

 

I’ve tried the examples in the ANSYS FLUENT tutorials, and there is nothing different from anything I’ve configured before. I understand that SDOF_properties works with the SI units, for which I customize only the mass and moments of inertia. With all this, I still don’t understand how to define a mass value of eg. 4.3e-4 kg, it can cause problems for me.

 

The case remains as a laminar flow, If you need more information don't hesitate to ask me.

 

If u have a different methodology to solve it, I'll gladly try it.

Thanks!!.