Project function in dolfinx

[dokken]

@b-cxy

In the legacy demo (Elasto-plastic analysis of a 2D von Mises material — Numerical tours of continuum mechanics using FEniCS master documentation), it is said the plastic strain (in quadrature function space) must first be projected onto the previously defined DG FunctionSpace: p_avg.assign(project(p, P0)); file_results.write(p_avg, t), how to do this in FEniCSx?

You seem to have implemented the projection already, so I dont really understand this question. See for instance Where to find 'project'-function in dolfinx? - #2 by nate

@b-cxy

Following item1, I defined a project function, but when trying to save the vector function in VTK file, the kernel died. please see the following code

Try to run your code as a Python script (rather than a notebook) as it might give you a error traceback you could share.

Please also consider simplifying your problem.
Start by removing one of the project functions, remove the loading loop and deduce what line of code is causing your crash.