@@ -17,6 +17,47 @@ Differences Between DuMuX 3.2 and DuMuX 3.1

- __Van Genuchten__: Corrected VanGenuchten-Mualem implementation of `dkrn/dSw`

- __AMGBackend__: The internal structure of the AMGBackend and the ParallelISTLHelper has been overhauled, as only used by the AMG, we did not make the changes backwards-compatible

- __Change matrix block arrangement for staggered models__: The matrix block structure has been adapted such that it complies with the literature standard, i.e., having the velocity block (C) on `M[0][0]`

rather than on `M[1][1]`. This also requires re-arranging the submodels and properties in dumux-multidomain such that the face-related classes and vector entries now appear before the cell-centered ones.

```math

M = \begin{pmatrix}

A & B^T\\

B & C

\end{pmatrix}

\qquad => \qquad

M = \begin{pmatrix}

C & B^T\\

B & A

\end{pmatrix}

```

Backwards-compatibility can only be provided to a certain extent. The following changes need to made in the main file:

1.) change the order of the arguments for the `assembler` such that it reads: