# Natural Convection Air Temperature Problem

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 November 28, 2016, 13:25 Natural Convection Air Temperature Problem #1 New Member   Nils B. Join Date: Nov 2016 Posts: 6 Rep Power: 3 Hello guys I am modeling natural convection. Preasure Based and with Boussinesque. Basicly the simulation is working, but I am not really sure, how to propably display the air temprature. incoming air Temp : 293.15K Cylinder Temp: 303.15K The air closest to the cylinder should have a velocity of 0, BUT not the same temp as the cylinder (physics). When I now display the temperature of the air and cylinder, there is a strange temperature transition close to the wall of the cylinder, that does not seem to be influenced by the air flow velocity. This seems strange to me. When I now change the Variable to "Wall Adjacent Temperature" All looks quite good to me. But choosing "Wall Adjacent" for free floating air particles does not make mouch sense, does it? What is the right Variable for displaying the Air temperature in CFD Post? Is "just" the Air temperature not the actual air temperature? Hope you can help me!

November 28, 2016, 14:30
#2
Senior Member

Kushal Puri
Join Date: Nov 2013
Posts: 131
Rep Power: 6
Quote:
 Originally Posted by theBerNii Hello guys I am modeling natural convection. Preasure Based and with Boussinesque. Basicly the simulation is working, but I am not really sure, how to propably display the air temprature. incoming air Temp : 293.15K Cylinder Temp: 303.15K The air closest to the cylinder should have a velocity of 0, BUT not the same temp as the cylinder (physics). When I now display the temperature of the air and cylinder, there is a strange temperature transition close to the wall of the cylinder, that does not seem to be influenced by the air flow velocity. This seems strange to me. When I now change the Variable to "Wall Adjacent Temperature" All looks quite good to me. But choosing "Wall Adjacent" for free floating air particles does not make mouch sense, does it? What is the right Variable for displaying the Air temperature in CFD Post? Is "just" the Air temperature not the actual air temperature? Hope you can help me!
Picture 2 looks correct. whats the problem in that

 Tags convection, flow, temperature, wall adjacent temperature

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