On Jul 12, 2011, at 3:06 AM, Marc Saudreau wrote:

> You are right, by using the DiffusionTermNoCorrection the system converges.
> Unfortunately, and that's what we could expect with skewed cells, the solution
>  I get is not really the right solution.

To what extent is not not right? Is it off by a little or is it completely 
wrong? I ask, because in your original email, you said

>> I've decided to try a more simple case: adiabatic conditions on lateral and 
>> bottom faces, and T = Tair on the top face

but the code you sent had

    UpBC =  FixedValue(faces=maskUpSurface, value= Tair)
    LowBC =  FixedValue(faces=maskLowerSurface, value= Tair)



> I guess there is no solution unless I can use GMSH meshes composed of  
> quadrangles and hexahedrons !
>  Do you plan to make this available in a next release of Fipy ?

The next release has support for quadrangles and hexahedrons.



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