July 20, 2020 at 12:05 amJabalySubscriber
1.Mixture model –noslip velocity –implicit-without phase interactions
5.K-e model (turbulence)
6.V water =3m/s …………..nozzle
7.V air=3m/s …………….domain
8.Outlet= atm pressure
10.Default properties for materials (water and air)
The problem is:
There is a problem with the behavior of water when I get the volume fraction results. as you see in fig (A1 to A5) the water flow like a transient behavior ( 200 iterations is different from 400 iterations and so on).
Note#2: I applied steady-state, not transient
I think I need to apply phase interactions between water and air. but I don't know what is good interaction between them that I should apply to get the volume fraction as the paper (figure .
may you help me to solve this problem?
July 20, 2020 at 7:28 amDrAmineAnsys Employee
As we cannot read any paper can you please double check your boundary conditions? Are they accounting for any other thing like mass transfer from water to water-vapor in air? Moreover from your picture there is clear stratification from the other pictures a sort of diffusion which tells me that diffusion force is missing in your case.
July 20, 2020 at 4:04 pmRobAnsys Employee
Please also post the velocity field at 1200 iterations.
July 20, 2020 at 6:23 pmJabalySubscriber
Thanks for your reply.
plz see attached link (pdf file), this is a presentation about that paper. It will give us a good and quick view of the ejector.
and yes you are right, the flow looks like stratified flow in my result, and I need to apply something like ( evaporating -condensation interaction) or ( cavitation) , I should reach to bubble flow as the paper.
but you know, evaporating -condensation interaction can be used when you have one fluid like water, and then convert liquid to vapor.
but in our system we have air-water mixture, so what is the interaction that I can apply in fluent ?!
Note#1: the paper does not mention anything about the interaction between water and air.
Note#2: you can see the velocity and pressure counters, also velocity profiles
July 20, 2020 at 6:42 pmJabalySubscriber
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