# Pressure loss prediction

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 June 12, 2007, 08:04 Pressure loss prediction #1 Arata Ivan Guest   Posts: n/a Hallo.. I have a case of pressure loss prediction of a control valve (3d problem). 4 boundary areas: -Inlet section (condition: pressure inlet) -Outlet section (condition: ????) -Pipe wall (condition: wall) -Valve disc wall (condition: wall) My input are: -Geometry -Inlet flow data (p,T,W..) I want to obtain the valve outlet pressure using K-Epsilon. What's the best way for you? What conditition can I set (best way) for the outlet section? Thanks a lot...

 June 12, 2007, 15:02 Re: Pressure loss prediction #2 AJ Guest   Posts: n/a See if this demo helps you.. although this is in CFX but could help you... http://www-harwell.ansys.com/demoroo...ls.php?id=8,31 In your case you could use: Inlet velcity BC Outlet pressure BC (0 value) Pressure drop will be pressure developed at inlet. Thanks, AJ

 June 13, 2007, 09:41 Re: Pressure loss prediction #3 Arata Ivan Guest   Posts: n/a Well, The "inverse" medology (inlet velocity-outlet pressure) is very nice, I will try it now for the CV prediction.... The CFX demo is nice too, but I think it's very simple because the input data are the inlet total pressure and the outlet staic pressure: INLET: Total pressure = 12psi OUTLET: Average static pressure (0Pa) Thank you Kind Regards Ivan

 June 14, 2007, 10:55 Re: Pressure loss prediction #4 Arata Ivan Guest   Posts: n/a Ok, case with inlet velocity and outlet pressure: I tried a inviscid test and the results are great! Of course, I can't evaluate the pressure drop by inviscid calculation bat I think the guideline is ok. Now I have K-Epsilon convergence problems, but i hope it's a grid problem..... We'll see... Thank you

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