Hi to all.I want to make a code using maccormack scheme in FDM.I have initial data as p=1N/m^2,U=0,density=1 and outlet as p=10,u=0 and density as 1.In momentum if i use euler scheme then i have requirement of pressure gradient which is directly related to p=density*R*T.I have three equationa as couninuity ,momentum and energy but four unknowns as density,pressure,velo and energy.Pls can anybody tell me how to solve it?in enrgy e=cv*T,but here both e and T are unknown.Anybody 's effort will be appreciated. Thank you. Mehul

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