[ztdep]

Dear friends:
In the momentum euqation, UEqn is a vector matrix , but why UEqn.A() return a volscalarField?
regards

[Rvadrabade]

Hi,

If not already check out following reference link.
fvScalarMatrix:- https://zhuanlan.zhihu.com/p/32940120
fvVectorMatrix:- https://zhuanlan.zhihu.com/p/32679170

In short, fvVectorMatrix is of form AX=B where
A is n X n, X is n X 3 and B is n X 3. Also, there are internalCoeffs added to A and boundaryCoeffs are added to B at the time of solving matrix.

It is tricky implementation, try to construct sample matrix on paper will give better and quicker idea.

Thanks