[Nek5000-users] non-physical temp. at walls

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

Hello all,

I wondered if anyone have ever experienced high/low nonphysical  
temperature field for a configuration in which there is a volumetric  
heat source.
I have such hot/cold spots very close to a few insulated walls as  
boundary conditions in my configuration. In fact, such temperatures  
have been observed in the elements adjacent to the wall. The heat  
source is uniform for part of the domain and zero for the rest of it.

It might be due to non-monotonicity of advection scheme and  
insufficient resolution. The minimum temperature can be clipped, but  
there is no way to limit the maximum temperature.

Any help would be appreciated.

Thanks,
Mohsen