[CFDguy77]

Hi, I'm currently busy simulating the air entrainment of air into the water when flowing over a stepped spillway (Dam spillway). I am using the Eulerian Multiphase model with large-scale interface detection with the s-gamma PBM. My simulation is currently only using the S-Gamma Entrainment model and runs into problems when the water reaches the first few steps and crashes due to either the Tke of water/air, or Sdr of water/air residuals becoming unstable.

Question: In the newer versions of Star-CCM+, are all of the S-Gamma models compatible with each other and/or should they be used together? (Referring to the s-gamma coalescence, breakup, and entrainment models).

[Aeronautics El. K.]

I had done some reading on those a few years ago and I think I use them in one of my templates. I'm not 100% but I'm fairly confident you can use them together.

In the problem you are looking at though, what difference would it make if you don't use them? Is it necessary to model those physics in this particular application?

[CFDguy77]

Originally Posted by Aeronautics El. K.

I had done some reading on those a few years ago and I think I use them in one of my templates. I'm not 100% but I'm fairly confident you can use them together.

In the problem you are looking at though, what difference would it make if you don't use them? Is it necessary to model those physics in this particular application?

Hi, yes it’s necessary. I am specifically looking at the air bubbles entrained in the water. I’ve managed to get to a point where the simulation diverges nicely with only the entrainment model, and thus far it seems to be accurate enough for what I want to achieve.