Dear all, if we have a Function u and we want to calculate \frac{\partial{u}}{\partial{x}}, we use u.dx(0). Now I need to calculate the derivative of Function u with respect to a direction, I showed this direction in the following figure: [Screenshot from 2024-06-23 13-18-37] Does anyone know how…

The small snippet looks fine to me. The best thing to do is to test it with a known u and v and see if you get what you expected.

Calculate the derivative of a Function with respect to a direction

dokken June 24, 2024, 10:00am 9

I would check what the estimated polynomial degree of the term is using ufl:

Topic		Replies	Views
Directional derivative of UFL expression	2	905	February 24, 2020
How to represent directional derivative of 1D elements in 3D space? variational formulation	3	227	December 11, 2023
Gradient of a Form as a vector	7	619	January 31, 2022
Poisson equation: imposed gradient BC? dolfinx	3	403	August 11, 2022
Derivatives in 1D variational formulation	2	590	October 15, 2020