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-   -   gamma in "totalPressure" BC (https://www.cfd-online.com/Forums/openfoam-pre-processing/64502-gamma-totalpressure-bc.html)

squadron May 13, 2009 08:38
gamma in "totalPressure" BC
 
Simple question, but I just can't find it anywhere:

The gamma-term in the totalPressure BC, is that simply the specific heat ratio?

Thanks.

gaza May 22, 2017 02:59
Yest you are right:
Code:
4. compressible supersonic (\f$\gamma > 1\f$):
 69        \f[
 70            p_p = \frac{p_0}{(1 + 0.5 \psi G |U|^2)^{\frac{1}{G}}}
 71        \f]
 72        where
 73        \vartable
 74            p_p    | pressure at patch [Pa]
 75            p_0    | total pressure [Pa]
 76            \gamma  | ratio of specific heats (Cp/Cv)
 77            \psi    | compressibility [m2/s2]
 78            G      | coefficient given by \f$\frac{\gamma}{1-\gamma}\f$
 79        \endvartable


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