forward step tutorial

anishtain4 · January 15, 2013, 15:34

I'm trying to run the forward step tutorial with rhoCentralFoam but in non-normalised form. To achieve this I tried to change some settings

in thermophysical dictionary for air as:
cp=1.006
molWeight= 28.97

since the adiabatic index for air is 1.4 then with:
Cp=ghama*nMol*R/(ghama-1)/molWeight

one would have: nMol=0.001

for a normal condition in initial conditions also T=273, U=990 ( to have Ma=3) and to have rho=1.2 from P=rho*R*T/molWeight would yield p=94022

in an inviscid flow characteristic length is not important, but the angles and proportions so no modification is needed on geometry. After setting all these you can't have a run. Can anyone please tell me why?

anishtain4 · January 17, 2013, 12:44

No one can try it and tell me something? pleaseeee

dhuckaby · January 17, 2013, 16:02

Have you tried cp = 1006 J/(kg-K) and nMoles = 1 ?

January 15, 2013, 15:34	forward step tutorial	#1
anishtain4 Senior Member Mahdi Hosseinali Join Date: Apr 2009 Location: NB, Canada Posts: 273 Rep Power: 18	I'm trying to run the forward step tutorial with rhoCentralFoam but in non-normalised form. To achieve this I tried to change some settings in thermophysical dictionary for air as: cp=1.006 molWeight= 28.97 since the adiabatic index for air is 1.4 then with: Cp=ghamanMolR/(ghama-1)/molWeight one would have: nMol=0.001 for a normal condition in initial conditions also T=273, U=990 ( to have Ma=3) and to have rho=1.2 from P=rhoRT/molWeight would yield p=94022 in an inviscid flow characteristic length is not important, but the angles and proportions so no modification is needed on geometry. After setting all these you can't have a run. Can anyone please tell me why?

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January 17, 2013, 12:44		#2
anishtain4 Senior Member Mahdi Hosseinali Join Date: Apr 2009 Location: NB, Canada Posts: 273 Rep Power: 18	No one can try it and tell me something? pleaseeee

January 17, 2013, 16:02		#3
dhuckaby New Member David Huckaby Join Date: Jul 2009 Posts: 21 Rep Power: 16	Have you tried cp = 1006 J/(kg-K) and nMoles = 1 ?