# gamma in "totalPressure" BC

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 May 13, 2009, 08:38 gamma in "totalPressure" BC #1 New Member   Age Nammensma Join Date: Mar 2009 Posts: 10 Rep Power: 10 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.

 May 22, 2017, 02:59 #2 Senior Member   Przemek Join Date: Jun 2011 Posts: 189 Rep Power: 8 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 __________________ best regards pblasiak

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