[gregot]

Hi

I'm trying to simulate a simple flow with some bubbles in it. I activate drift flux model, density evaluation, adiabatic bubbles, RNG turbulence model.

The problem is that I can't see a right density evolution during the simulation and that I don't know which parameter to choose to see where are the bubbles.

[MuxaB]

Originally Posted by gregot

Hi

I'm trying to simulate a simple flow with some bubbles in it. I activate drift flux model, density evaluation, adiabatic bubbles, RNG turbulence model.

The problem is that I can't see a right density evolution during the simulation and that I don't know which parameter to choose to see where are the bubbles.

Since you are using the drift-flux model, I assume the bubbles are small compared to the mesh size and numerous, right? In that case they are modeled as a continuous phase, described by a concentration in the mixture rather than directly as bubbles. In the one-fluid drift-flux model, it is the mixture density that is the variable of interest. If you are using the two-fluid approach, then it is the fluid fraction.

The adiabatic bubble model does not play any role in that model.