Hi, I m new to fenics, I wanted to know if it is possible to generate electric field (gradient from electric potential). I have the values for electric potential generated at each voxel or tetrahedron inside the mesh. I want to find the electric field at each tetrahedra. I am confused about how to d…

See: [image] How to interpolate the derivative of CG functions in DG space dolfinx You can use dolfinx::fem::Expression. See: Hyperelasticity — DOLFINx 0.3.1 documentation for C++ or Solving a time-dependent problem — FEniCS 22 tutorial for a Python example

This works for old fenics versions as well or just in dolfinx

In legacy DOLFIN you would have to project the quantity (grad(u)) into an appropriate function space instead of interpolating it as in DOLFINx. Please note that we advice all new users to use DOLFINx: The new DOLFINx solver is now recommended over DOLFIN

Calculating gradient from mesh

General

dokken April 3, 2024, 12:34pm 2

See:

Topic		Replies	Views
Generating electric field from electric potential dolfinx mesh	2	188	April 2, 2024
Derivative in dolfinx dolfinx	11	1082	January 29, 2024
Projecting gradient General mesh	5	137	April 17, 2024
Compute E-field from the potential field (DOLFINx v0.9.0) dolfinx	1	88	December 20, 2024
[Gradient w.r.t MeshFunction] General	7	508	November 25, 2022

Calculating gradient from mesh

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