> "To enable the use of the MappingQ1Eulerian class also in the context of
> parallel codes using the PETSc wrapper classes, the type of the vector can
> be specified as template parameter EulerVectorType Not specifying this
> template argument in applications using the PETSc vector classes leads to
> the construction of a copy of the vector which is not accessible
> I can't understatnd what it means and what changes I should make.
The class MappingQ1Eulerian has a template argument for the vector
type. You need to set this to be a parallel vector (like
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