biswanath
Mechanical
- Sep 20, 2006
- 2
Hi all,
I am working with Fluent 6.2 in trying to model open channels. In this regard I am facing some problem related to open channel boundary conditions in VOF model in Fluent.
My questions are
1) How to specify different boundary conditions in open channel simulations?
2) Is it appropriate to select two phase model in case of open channel?
3) If i select only one phase(i.e., water) what should be outlet boundary condition (as in case of open channel outlet pressure will not be atmospheric pressure then what should be it's boundary condition)?
4) In case of two phase model if i select some boundary condition and specify some phase(air or water or mixture) to the domain then the others automatically takes the same phase by default. what can i do for it?
5) In time of 2D modeling the open channel in gambit whether it is necessary to create air inlet and water inlet differently by two edges? Or it can be specified by one edge only? How can I specify same inlet group ID for them????
For your kind information i am glad to inform you that i have read the example of VOF in the tutorial guide of fluent. But none of them have discussed about open channel boundary condition. It is simple to simulate pipe flow but open channel is quite different. At this moment i want to simulate a simple 2Dcase where the channel length would be 10 m and flow depth of water is 0.5 m where total depth of channel is 1m. Above the water there is air. I want to input the entrance water flow velocity. At the end outlet water...what should be the boundary condition? It would not be atmospheric pressure because open channel is infinitely long.
biswanath
I am working with Fluent 6.2 in trying to model open channels. In this regard I am facing some problem related to open channel boundary conditions in VOF model in Fluent.
My questions are
1) How to specify different boundary conditions in open channel simulations?
2) Is it appropriate to select two phase model in case of open channel?
3) If i select only one phase(i.e., water) what should be outlet boundary condition (as in case of open channel outlet pressure will not be atmospheric pressure then what should be it's boundary condition)?
4) In case of two phase model if i select some boundary condition and specify some phase(air or water or mixture) to the domain then the others automatically takes the same phase by default. what can i do for it?
5) In time of 2D modeling the open channel in gambit whether it is necessary to create air inlet and water inlet differently by two edges? Or it can be specified by one edge only? How can I specify same inlet group ID for them????
For your kind information i am glad to inform you that i have read the example of VOF in the tutorial guide of fluent. But none of them have discussed about open channel boundary condition. It is simple to simulate pipe flow but open channel is quite different. At this moment i want to simulate a simple 2Dcase where the channel length would be 10 m and flow depth of water is 0.5 m where total depth of channel is 1m. Above the water there is air. I want to input the entrance water flow velocity. At the end outlet water...what should be the boundary condition? It would not be atmospheric pressure because open channel is infinitely long.
biswanath
