I'm using 2 mass fraction equation in cfx 4.4.
If I use USRSPH routine I can only set the Cp of all the mixture? Or I can set the value of the Cp of the background fluid?
Re: Specific heat
If your mass fractions are very small (ie. trace amounts) you can get away with setting the background fluid only. Otherwise, yes, you need to set the mixture CP and CPBAR. Fortunately this is easy as it is a straight mass fraction weighted summation of each component including the background fluid.
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