In multi-specie systems the calculation of Cp and Cv is relatively expensive due to the cost of mixing the coefficients of the specie thermo model, e.g. JANAF, and it is significantly more efficient if these are calculated at the same time as the rest of the thermo-physical properties following the energy solution. Also the need for CpByCpv is also avoided by the specie thermo providing the energy type in the form of a boolean 'enthalpy()' function which returns true if the energy type is an enthalpy form.
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About OpenFOAM
OpenFOAM is a free, open source computational fluid dynamics (CFD) software package released by the OpenFOAM Foundation. It has a large user base across most areas of engineering and science, from both commercial and academic organisations. OpenFOAM has an extensive range of features to solve anything from complex fluid flows involving chemical reactions, turbulence and heat transfer, to solid dynamics and electromagnetics.
Copyright
OpenFOAM is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version. See the file COPYING in this directory or
http://www.gnu.org/licenses/, for a description of the GNU General Public
License terms under which you can copy the files.