Simulating a high pressure flow through a valve
Hi all!
I'm new on this forum and i request your help in simuling a fluid flow through a valve. The simulations i tried until today where not satisfying. Little sum up : The valve aim is to make a detent from 229 to 100 bar nearly. This is this kind of cage choke. Choke Photo I want to modelise air flow and then water flow, given that the valve is made to work on both of them. For air flow i take these boundary conditions : input : pressure inlet gauge pressure 229 bar initial / supersonic gauge pressure 220 bar temperature 180°C output : pressure outlet gauge pressure 100 bar temperature 140°C I don't know if these parameters are correct for you? Because with these pressures, when i simulate, at the second iterations the solver always send back error in AMG solver : temperature...:mad: I'm not a pro in fluent and need perhaps a good tutorial in how to modelise the reality in the soft... do you know one? Thank you for advance. ;) |
I would start with water flow and without energy equation.
Just a simple incompressible flowfield. If you get correct results, then enable energy equation. Then you may try with air flow, but I guess you will have to treat your problem as compressible |
Hi -mAx-
Thx for your help! Never tried water flow, i will try this evening! Yesterday, with energy equation enabled and these parameters i get 1e+19 Pa in my results and 1e+5 in velocity... Something's wrong with my parameters... Do you think i must add a pressure farfield before and after the valve? Or a pressure/velocity inlet in a face is good? Kro |
If you know the massflow rate passing through your valve, I would work with velocity-inlet and pressure outlet combination.
But as I said, check first water flow (basic flowfield). |
Yes i will try this way, but is it possible (for the air or gas test) use the velocity inlet given that i will study a compressible fluid problem? Fluent says it's not possible!
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For the compressible side of your project, check tutorial about "Modeling external compressible flow"
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No matter that my project is internal flow?
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I don't think there is huge difference.
You may also check tutorial "Modeling Unsteady Compressible flow" (internal) |
Ok thank you a lot i will say if that worked or not and post some results ^^
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