# Time-averaged wall temperature not equal to the value imposed by the BC

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 December 30, 2020, 06:23 Time-averaged wall temperature not equal to the value imposed by the BC #1 New Member   Join Date: Apr 2020 Posts: 26 Rep Power: 6 Hi everybody, I am performing a transient simulation with constant inlet total pressure and temperature and constant wall temperature. I do not understand why the time-averaged wall temperature differs from the value imposed by the boundary condition in some areas of the domain close to flow-impingement (12% difference). I waited for a long time before starting sampling (waiting time = 5 x throughflow time), and I sampled for t_sampling=5xthrouflow time. The time-step chosen is equal to 1/500 x throughflow time, and the sampling interval is 1. Any suggestions? Thank you in advance.

December 30, 2020, 06:47
Uncheck "Node values"
#2
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ebrahim
Join Date: Oct 2012
Posts: 5
Rep Power: 13
Quote:
 Originally Posted by cfdEng_ Hi everybody, I am performing a transient simulation with constant inlet total pressure and temperature and constant wall temperature. I do not understand why the time-averaged wall temperature differs from the value imposed by the boundary condition in some areas of the domain close to flow-impingement (12% difference). I waited for a long time before starting sampling (waiting time = 5 x throughflow time), and I sampled for t_sampling=5xthrouflow time. The time-step chosen is equal to 1/500 x throughflow time, and the sampling interval is 1. Any suggestions? Thank you in advance.

Hi
Uncheck "Node values" in the options section. I hope the problem is solved.

December 30, 2020, 08:10
#3
New Member

Join Date: Apr 2020
Posts: 26
Rep Power: 6
Quote:
 Originally Posted by ebrahim27 Hi Uncheck "Node values" in the options section. I hope the problem is solved.
Unfortunately, it did not solve the problem.

Would you have any other guess?

Thank you very much.

 Tags boundary condition, time averaged, transient 3d

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