Learning Forum

[Ghinna Nur Akram]

Hi, I have a problem with my Eulerian-Multiphase flow, the secondary phase cannot flow inside the primary phase. The primary phase is water and the secondary phase is air. I want to inject air from the bottom of the domain and it doesn't work. What should I do? Thank You

[Omkar Pawar]

Hi Vargoba,

The current problem statement is not very clear. Nevertheless, I will suggest based on few assumptions.

As from the problem description the case that you are simulating consist of a flow of air and water inside a domain. In general, scenario these are two immiscible fluids, and there would be the presence of clear distinct interface between the two fluids. I am assuming that you are currently trying to solve a problem with a similar expectation.
Kindly check your case with VOF method, instead of Eulerian-Multiphase model.

Eulerian-Model solves for interpenetrating flows and would provide you with similar outcomes. While in VOF multiphase model you may you should be able to clearly track the demarcation between the two flowing fluids if the mesh refinement is sufficient.

Also a few aspects are not clear to me from the image that you have posted.

1. Are the side domain walls?
2. Why is the flow split at inlet. As from the image it looks that the bottom surface is inlet BC. The flow should be completely coming from the bottom. Here it is not happening.
3. If I assume bottom to be inlet and the top to be exist will the domain be completely filled after some time?