# Simulating a high pressure flow through a valve

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 July 1, 2010, 03:06 Simulating a high pressure flow through a valve #1 New Member   Join Date: Jul 2010 Posts: 5 Rep Power: 9 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... 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.

 July 2, 2010, 02:05 #2 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,233 Rep Power: 34 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 __________________ In memory of my friend Hervé: CFD engineer & freerider

 July 2, 2010, 02:38 #3 New Member   Join Date: Jul 2010 Posts: 5 Rep Power: 9 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

 July 2, 2010, 03:44 #4 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,233 Rep Power: 34 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). __________________ In memory of my friend Hervé: CFD engineer & freerider Last edited by -mAx-; July 2, 2010 at 04:13.

 July 2, 2010, 03:50 #5 New Member   Join Date: Jul 2010 Posts: 5 Rep Power: 9 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!

 July 2, 2010, 04:16 #6 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,233 Rep Power: 34 For the compressible side of your project, check tutorial about "Modeling external compressible flow" __________________ In memory of my friend Hervé: CFD engineer & freerider

 July 2, 2010, 04:34 #7 New Member   Join Date: Jul 2010 Posts: 5 Rep Power: 9 No matter that my project is internal flow?

 July 2, 2010, 05:18 #8 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,233 Rep Power: 34 I don't think there is huge difference. You may also check tutorial "Modeling Unsteady Compressible flow" (internal) __________________ In memory of my friend Hervé: CFD engineer & freerider

 July 2, 2010, 05:20 #9 New Member   Join Date: Jul 2010 Posts: 5 Rep Power: 9 Ok thank you a lot i will say if that worked or not and post some results ^^

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