[EmadTandis]

Hi all,
I need to evaluate "u.grad(B)" where u is velocity vector and B is a second order tensor. But I faced an error says gradient of tensor cannot be evaluated. Do you have any suggestion to evaluate the term?

[massive_turbulence]

Originally Posted by EmadTandis

Hi all,
I need to evaluate "u.grad(B)" where u is velocity vector and B is a second order tensor. But I faced an error says gradient of tensor cannot be evaluated. Do you have any suggestion to evaluate the term?

If you can take the derivative of each component of the 2nd order tensor that would probably work! You would need to do some extra coding on your part.

From: Calculation of Gradient of a Tensor (Stress) in Cylindrical Coordinates in openFoam

"Unfortunately I didn't find any solution, however I defined some volScalarField for every component of stress tensor separately and then calculated the derivative of them."

[roozbeh_s]

Originally Posted by EmadTandis

Hi all,
I need to evaluate "u.grad(B)" where u is velocity vector and B is a second order tensor. But I faced an error says gradient of tensor cannot be evaluated. Do you have any suggestion to evaluate the term?

Dear Emad,
have you found any solution to take a gradient of a tensor?