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an inconsistence of gamma in nacaAirfoil tutorial of sonicFoam
// caseDir/0/p // gamma = 1.3 ... "outlet.*" { type waveTransmissive; field p; psi thermo:psi; gamma 1.3; fieldInf $pressure; lInf 1; value $internalField; } ...
However, in the thermophysical file, gamma = 1.4 which can be calculated by molecular weight and Cp.