Hi Khaled From the mess
From the message above, we can infer that the type of alpha and U are incompatible. for instance, volScalarField + volVectorField
I also noticed that the code segment below
+ fvm::Sp(ix, alpha)
it is a impilit operation, if alpha and U are not the same object, adding them will also cause the problems.
Hope this helps
Hi Junwei, thanks for the a
thanks for the answer.
For alpha i add
I thought for ix it is enough to be a volScalar or a Scalar.
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