# Impact temperature on an aircraft

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 August 17, 2011, 12:01 Impact temperature on an aircraft #1 Member   Charles Join Date: May 2011 Location: France Posts: 78 Rep Power: 6 Hi, I would like to simulate the temperature of the surface of a flying aircraft. The main point of interest is the impact temperature on the leading edges to determine icing datas. I didn't succeed in modeling it with Fluent. I used different models (Laminar, Spalart Allmart, k-Espilon) with a coupled solver but I get unsatisfying results. The thing is quite disturbing because after like 20 iterations I get a result that looks pretty good with a higher temperature on the leading edges. But when I iterate more the aircraft surface temperature become constant except for some small hot and randomly located zones. I activated the viscous heating, and I set the wall and the external temperature at the same value (240 K). The flow speed is 180 m/s and the air density 0.5 kg/m3. What would you do to solve such a case in terms of model, boundary settings....? There is no tutorial that is about the impact temperature.

 August 17, 2011, 18:44 #2 Member   Charles Join Date: May 2011 Location: France Posts: 78 Rep Power: 6 I made some extra tests on a simple cube but I get divergent results after 200 iterations, no matter which solver I chose. Do somebody have some pieces of advice to share about this viscous heating on a wall ?

 August 18, 2011, 12:01 #3 Member   Charles Join Date: May 2011 Location: France Posts: 78 Rep Power: 6 My test on the cube finally succeed with the Coupled k-epsilon solver. Still, when I try it on the real geometry, I get the message "Time step reduced for xx cells" after like 200 iterations, and the residuals are diverging a few iterations later... I read that it's due of sudden changes of temperature between iterations and that it could be caused by wrong solver setup... Can someone help me out ?

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