fin

Arvin · February 13, 2014, 07:59

I am doing steady state temperature distribution of rectangular fin. But, I find my working fluid air stationary with solution converging in just 5 iterations.I have specified density of air as ideal gas and the side walls are kept at 300K. Temperature of hot side is 1000K.Are my boundary conditions correct? Is density of air can be ideal gas?

ghost82 · February 13, 2014, 10:05

5 iterations??
Are you sure you have a converged solution?Try to decrease residual values and see if they are stable after some more iterations.
Yes, I think ideal gas is a good approximation; I think Boussinesque approximation cannot be used as you have a big deltaT.

February 13, 2014, 07:59	fin	#1
Arvin New Member Arvindh Join Date: Oct 2013 Posts: 19 Rep Power: 13	I am doing steady state temperature distribution of rectangular fin. But, I find my working fluid air stationary with solution converging in just 5 iterations.I have specified density of air as ideal gas and the side walls are kept at 300K. Temperature of hot side is 1000K.Are my boundary conditions correct? Is density of air can be ideal gas?

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February 13, 2014, 10:05		#2
ghost82 Senior Member Rick Join Date: Oct 2010 Posts: 1,016 Rep Power: 27	5 iterations?? Are you sure you have a converged solution?Try to decrease residual values and see if they are stable after some more iterations. Yes, I think ideal gas is a good approximation; I think Boussinesque approximation cannot be used as you have a big deltaT.