[Peter Ehab]

Hi everybody

I want to simulate the movement of a solid particle in a water droplet that is flowing inside a channel filled with oil.
I'm new to Fluent. I tried the 2D VOF model and patched two circles (for the droplet and the particle) but the problem is that the simulation shows that the particle leaves the droplet and flows alone! (which isn't true!). It's kind of treating them as separated objects.

Is there any way to limit the movement of the particle to be inside the droplet only? (to tell fluent that the particle is inside the emulsion)

Should I use another model? I can't use DPM because I want to control the viscosity of the particle as well as the density.

Attached, a schematic of the problem.

Thanks in advance

[Peter Ehab]

:/ any help would be really appreciated

[Shalabh]

You can define the droplet boundary as a named section and then provide a suitable boundary condition in the setup, so as to define the particle treatment when it strikes the inside droplet boundary.

[Peter Ehab]

Thanks a lot Shalabh for your help!

Do you know what boundary condition should I use for the droplet boundary? or how to define the particle treatment?
I use Interior as a boundary condition for the droplet boundary but this doesn't work. I also tried to define it as wall and use deformable dynamic mesh (as the droplet should be deformable not rigid) but the droplet doesn't move!