fvm::Sp (A , B)
hi foamer
could u please tell me whats the functionality of fvm::Sp (A,B) ? whats the difference between fvm::Sp (A,B) and A*B ? thanks in advance 
fvm::Sp(A, B) is used for an implicit source term, so "B" is the variable you are solving for. Using A*B will leave the term on the right hand side of the equations. Depending on the sign of your source term implicit treatment can help with stability.

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