having problem with total temperature

imnull · November 2, 2012, 14:42

Hi All,
Im simulating CD nozzle with CFX, ideal gas, SST formulation (hex mesh is forever for supersonic flows). Vel. and Mach# are in comparison with experimental data, BUT TOTAL TEMPERATURE is NOT

.

1.jpg

Is anyone can explain me why the total(stagnation) temperature rises right after nozzle end?! what should I turn on/off within CFX pre to fix this issue...?

2.jpg

thanks in advance.

BTW-converged WELL + I did not change Cp

3.jpg

ghorrocks · November 3, 2012, 04:38

What is the stagnation temp graph of? Stag temp along a line? Or averages? Or something else?

imnull · November 3, 2012, 08:44

Quote:

Originally Posted by ghorrocks

What is the stagnation temp graph of? Stag temp along a line? Or averages? Or something else?

along the axe line of nozzle.. see pic
5.jpg

imnull · November 5, 2012, 12:24

Quote:

Originally Posted by ghorrocks

What is the stagnation temp graph of? Stag temp along a line? Or averages? Or something else?

?!
any suggestions gentlemen

November 2, 2012, 14:42	having problem with total temperature	#1
imnull Member Dmitry Join Date: Nov 2011 Posts: 45 Rep Power: 14	Hi All, Im simulating CD nozzle with CFX, ideal gas, SST formulation (hex mesh is forever for supersonic flows). Vel. and Mach# are in comparison with experimental data, BUT TOTAL TEMPERATURE is NOT . 1.jpg Is anyone can explain me why the total(stagnation) temperature rises right after nozzle end?! what should I turn on/off within CFX pre to fix this issue...? 2.jpg thanks in advance. BTW-converged WELL + I did not change Cp 3.jpg Last edited by imnull; November 2, 2012 at 15:19. Reason: adding the graph

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November 3, 2012, 04:38		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	What is the stagnation temp graph of? Stag temp along a line? Or averages? Or something else?