I'm trying to simulate in Fluent a biphase flow of a tank indcued by jets. This system is closed system, so the usual transient approach for localize and simulate the interface by the boundary conditions is not possible.
I tried to "fill" the tank, using just velocity inlet conditions, calculating the iniciatl interface position by the discharge time, but it didn't work.
I also tried using VOF proportions, expecting the gravity to create automatically the interface, but it didn't work as wel.
Have anyone ideas for filling a tank to give an initial interface position to be simulated?
Use this forum it can help you. Good luck.
http://www.cfd-online.com/Forums/cfx/122793-gravitational-water-flow-closed-channel.html
I did not actually get your problem correctly. But still I can help you with certain settings which can be useful.
- If its a closed system, you can patch a certain region with liquid and give the gravity direction and magnitude. You should specify the correct operating density. And this should be the density of lighter phase.
- For multiphase, VOF approach should work without any problem. You should specify the proper surface tension value inorder for the VOF solver to track the interface between the two phases.
http://www.sciencedirect.com/science/article/pii/S0005273699002217
Dear Guilherme,
If I well understood the problem, you want to simulate a filling tank process where you seek to track the interface between water and air for the jet flowing in and for the liquid part at the bottom. if this is true, than you have an open system (mass is not constant) and transient behavior. I found this video (https://www.youtube.com/watch?v=ijkpJnWyZ3c). I think you want to do similar simulations. Maybe if the initial conditions are void fraction 1 for air inside the tank and 1 at the inlet for water. Of course you need to specify the density and the gravity and its direction and the surface tension for water. this should work. maybe this video can help you too https://www.youtube.com/watch?v=xQBvYceTg8E.
Good luck.
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