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-   -   THE airfoil CP PLOT IN FLUENT IS JUST NOT POSSIBLE (http://www.cfd-online.com/Forums/main/14742-airfoil-cp-plot-fluent-just-not-possible.html)

Rif February 5, 2008 20:27

THE airfoil CP PLOT IN FLUENT IS JUST NOT POSSIBLE
 
Hi, i'm running an airfoil simulation in the cfd code Fluent. After my solutions converged, i viewed the Coefficient of pressure plot for my aerofoil. The maximum Cp is more than 1. This does not make sense according to Bernoulli's equations. Can anybody help?

Rif

Charles February 6, 2008 06:54

Re: THE airfoil CP PLOT IN FLUENT IS JUST NOT POSS
 
Did you set the right reference values? Also, depending on how far away your boundaries are, and exactly what BC's you specify, it is possible to get a horisontal pressure gradient effect that would show up in a slightly higher stagnation pressure coefficient.

Praveen. C February 6, 2008 10:15

Re: THE airfoil CP PLOT IN FLUENT IS JUST NOT POSS
 
If it is compressible flow, then you can get more than one. Back to basic gas dynamics, read Anderson or some such book.

Rif February 6, 2008 12:13

Re: THE airfoil CP PLOT IN FLUENT IS JUST NOT POSS
 
It is NOT a compressible flow. My density is constant.

Rif


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