[Bug]: Divergence of VectorField should be compatible with ScalarField

[sbstndb]

What happened?

In the Capillarity code, we compute the divergence of a VectorField. But, during the execution, there is a bug: xt::broadcast_error: Incompatible dimensions of arrays

Workaround

A potential solution is to assign the return type as a VectorField with n_comp=1. This solution resolve the issue.

Suggestion:

The team want the divergence to return a ScalarField, or, to be able to convert them to ScalarField.

Input code

no input code.

What expected?

We expecte dthe code to work without any issue

What is your operating system?

Linux

How did you install our software?

conda or mamba

Software version

0.23.0

Relevant log output

Code of Conduct

• [x] I agree to follow this project's Code of Conduct

[gouarin]

Could you extract a minimalist example in order to fix this issue ?

[sbstndb]

I will try.