# CP values higher than 1 in fluent simulations

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 June 19, 2007, 05:59 CP values higher than 1 in fluent simulations #1 farhan Guest   Posts: n/a I'm simulating truck cabin and side rearview mirror in 3D using Fluent. The problem I'm facing is that the cp values at the front part (Stagnation) are higher than 1. Can anybody anhave the answe rfor that?

 June 20, 2007, 18:50 Re: CP values higher than 1 in fluent simulations #2 red lemon Guest   Posts: n/a change reference velocity and area in solve>controls>reference values

 June 21, 2007, 19:09 Re: CP values higher than 1 in fluent simulations #3 farhan Guest   Posts: n/a there is no area or velocity given in Solve>controls>reference values

 June 22, 2007, 04:40 Re: CP values higher than 1 in fluent simulations #4 red lemon Guest   Posts: n/a sorry its in report>reference values change the defaults to be specific to your case and the reporting will use these values in the calculation for cp, cl, cd etc

 June 22, 2007, 05:51 Re: CP values higher than 1 in fluent simulations #5 Luca Guest   Posts: n/a What value you get? much higher than 1? or very close (about 1.1/1.2) Luca

 June 22, 2007, 06:18 Re: CP values higher than 1 in fluent simulations #6 farhan Guest   Posts: n/a Its not that high. its around 1.13 and for some cases its around 1.1

 June 22, 2007, 06:19 Re: CP values higher than 1 in fluent simulations #7 farhan Guest   Posts: n/a yeah I know that, and I have used the values according to reference values of my problem

 June 22, 2007, 08:01 Re: CP values higher than 1 in fluent simulations #8 Luca Guest   Posts: n/a It could be a problem due to the mesh dicretization. I think that if you try to refine the mesh in that region the cp should get closer to 1. But remember: for compressible flow (Mach number higher than 0.3) the Cp is higher than 1. Luca

 June 22, 2007, 09:24 Re: CP values higher than 1 in fluent simulations #9 farhan Guest   Posts: n/a Yeah! ok Thnx, I'm checking it now.

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