# Specific heat in STAR-CD

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 November 24, 2005, 06:35 Specific heat in STAR-CD #1 Andrew Guest   Posts: n/a I have a problem in definition of specific heat in STAR-CD. Methodology guide says: STAR-CD offers input of "mean specific heats". Online help for POLYNOMIAL input says: calculate the "specific heat" Cp as a polynomial function of temperature. Online help for USER-CP coding says: supply desired variations of "mean Cp and Cv" in subroutine SPECHT. The difference between "specific heat" and "mean specific heat" is not clear. Post-processing in Prostar has options for plotting any of them. When I define Cp for ideal gas in polynomial form, the plotted values of "specific heat" are true, but the plotted values of "mean specific heat" are sligtly different. How should I treat POLYNOMIAL input of Cp? Can anybody help?

 November 26, 2005, 01:03 Re: Specific heat in STAR-CD #2 DB Guest   Posts: n/a I also have the same doubt "What is the difference between specific heat and mean specific heat in starCD" DB

 November 28, 2005, 03:01 Re: Specific heat in STAR-CD #3 Richard Guest   Posts: n/a If h is the enthalpy, then the specific heat is dh/dT whereas the mean specific heat is h/T. Or perhaps (h - h_ref)/(T - T_ref) ...

September 3, 2009, 23:33
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zhll
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Quote:
 Originally Posted by Richard ;170236 If h is the enthalpy, then the specific heat is dh/dT whereas the mean specific heat is h/T. Or perhaps (h - h_ref)/(T - T_ref) ...
hi Richard and all,about 3 years later.
what h_ref and T_ref mean ? where and how to define them ?
Thanks for any replies .

(sorry for my poor english)

maolu