Transpose grad_u

[TLWise]

Similar to this code _grad_u[_qp] , can I program in the APP the Transpose _grad_u[_qp]?

[GiudGiud]

Hello

For sure. If u is a vector variable and grad_u is a RealTensorValue, then _grad_u[_qp].transpose() should work.
But if u is a regular variable, grad-u is a vector and you do not need to transpose it so we have not implemented it. You can use it as a vector

If in doubt, use a loop! It's the same performance

[TLWise]

I attempted to use the code as above. I received this error:

"error: 'const class libMesh::VectorValue' has no member named 'transpose'
106 | urn -diffusivityGradientProduct(_grad_u[_qp] + _grad_u[_qp].transpose(),"

[GiudGiud]

yes as a I mentioned, there is no transpose for a RealVectorValue, which is the type of the gradient of a regular field variable