Moving boundary in MP-PIC or CFD-DEM

MFiX
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1

I was wondering if MFiX support for moving boundary conditions and dynamic meshes in both CFD-DEM and MP-PIC simulations, specifically for scenarios such as simulating particle motion in a stirred tank/mixing vessel.

I noticed that the official MFiX tutorials include mixer simulations, but these are all single-phase cases that only account for particle motion, without considering the dynamic motion of the solid geometry (e.g., rotating impellers/moving plates) coupled with the fluid flow.

So I want to know:

  1. Does MFiX support moving boundary conditions (e.g., translational/rotational motion of internal solid geometries) in both CFD-DEM and MP-PIC solvers, while keeping the fluid solver enabled?
  2. Does MFiX support dynamic mesh adaptation for moving geometries in these two-phase flow solvers?
  3. Are there any official tutorials, example cases, or documentation available for two-phase (fluid-particle) mixer/stirred tank simulations with moving impellers in CFD-DEM or MP-PIC?

Thank you. Best regards.

KAKU

2

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These cases may be helpful to you

3

Thanks for your reply. But in the cases you mentioned above, the fluid solver is disabled.

4

To the best of my knowledge you can

  1. Have a moving boundary that the DEM phase responds to. These are called internal surfaces. However, these do not interact with the fluid phase. You could create the impeller from particles and give them a fixed angular velocity. The fluid would then experience the drag force between the particles and the underlying fluid cells but since MFiX is a unresolved CFD-DEM solver this would not enforce no-slip and no flow through the impeller.
  2. To the best of my knowledge there is no support for moving mesh that the fluid “feels”.