[Nek5000-users] Temperature Issue, non physical values for certain Pr num.

[nek5000-users at lists.mcs.anl.gov]

Hi, 



I am having an issue with temperature values in my domain. The domain consists of two inlets, one at a temperature of 300 and the other 100. It appears 

that the interface between the two is giving non-physical temperatures, but what is interesting is the magnitude of these over/under shoots is dependent on 

the Prandtl number.  To see the extend of this I saved the max/min temperature in the domain for several time steps. 



See the attached image.  The low Pr case had Pr = 0.005, where as the other case had Pr = 0.71.  Both cases show non - physical results, but the low Pr 

case seems to recover and approach the limits for the domain given by the boundary conditions.  In the other Pr = 0.71 case, the fluctuations and magnitudes are 

much larger and don't appear to stabilize and recover. 



Again, I have looked at fld files to confirm that these large differences occur at the interface between the hot/cold fluid.  Is there a solution to this problem? 



Thanks, 

Michael 
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