On Mar 22, 2013, at 12:38 AM, Edwin Sze Lun Khoo wrote:

> It turns out that my spatial discretization was too fine, so Python ran out 
> of memory. After decreasing my spatial discretization and trying the 
> PowerLawConvectionTerm that you suggested, I still get the "IndexError: id1 
> does not have the same size as b" error.

You still have it wrapped in a tuple.

[[-alpha]]/C**2 is a rank-1 CellVariable

[[-alpha]]/C.faceValue**2 is a rank-1 FaceVariable

([[-alpha]]/C.faceValue**2, ) is a tuple of rank-1 FaceVariables (of length 1) 
and FiPy doesn't know what to do with it.
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