Entropy when one uses JWL EOS
Entropy is usually given as S=P/rho**gamma when one uses the ideal-gas law family.
However, when one uses different forms of EOS like the Gruneisen or JWL EOS, one does not have such a gamma.
Please teach me how to find the entropy if I do use the JWL equation.
It is to be used in the construction of a limiter and in the ghost fluid method(GFM).
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