HIGH Pressure on Domain

Martin_Sz · March 8, 2016, 03:31

Hello
I have a question how to model a high pressure on domain 14 bars ??

When I make reference pressure 14 bars I didnt see a difference beetween this pressure and one bar on heat transfer process. Cooling system of the 800 C Bar

Best regards

tomson199 · March 8, 2016, 03:51

Show on an image what are you thinking about in more details.

Martin_Sz · March 8, 2016, 08:30

I have one steel rod in fluid domain (air)
I need to make heat transfer depend on pressure on domain.
If i define 14 bars or I define 1 bar I didnt see a difference (when I define on domain on reference pressure)
Best regards

ghorrocks · March 8, 2016, 17:52

If you are saying that you are comparing an atmospheric pressure model and a 14 bar model and are getting the same heat transfer - have you taken the higher pressure into account for the material properties? The density is much higher. You could also use a compressible gas model (eg ideal gas) and it would account for it automatically.

Martin_Sz · March 9, 2016, 02:33

Thanks Ghorrocks a lot ! Your answer was very helpful.
So I define ideal N2 gas with thermal energy solver and sst for turbulence.
And I have difference beetwen 1 bar and 14 bars
Best regards

March 8, 2016, 03:31	HIGH Pressure on Domain	#1
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 232 Rep Power: 12	Hello I have a question how to model a high pressure on domain 14 bars ?? When I make reference pressure 14 bars I didnt see a difference beetween this pressure and one bar on heat transfer process. Cooling system of the 800 C Bar Best regards __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

March 8, 2016, 08:30		#3
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 232 Rep Power: 12	I have one steel rod in fluid domain (air) I need to make heat transfer depend on pressure on domain. If i define 14 bars or I define 1 bar I didnt see a difference (when I define on domain on reference pressure) Best regards __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

March 9, 2016, 02:33		#5
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 232 Rep Power: 12	Thanks Ghorrocks a lot ! Your answer was very helpful. So I define ideal N2 gas with thermal energy solver and sst for turbulence. And I have difference beetwen 1 bar and 14 bars Best regards __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

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March 8, 2016, 03:51		#2
tomson199 Member Thomas Join Date: Dec 2014 Location: Poland Posts: 49 Rep Power: 11	Show on an image what are you thinking about in more details.

March 8, 2016, 17:52		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	If you are saying that you are comparing an atmospheric pressure model and a 14 bar model and are getting the same heat transfer - have you taken the higher pressure into account for the material properties? The density is much higher. You could also use a compressible gas model (eg ideal gas) and it would account for it automatically.