Thank you for your prompt reply which resolved my problem.

On Sunday, October 16, 2016 at 7:58:40 AM UTC-5, Timo Heister wrote:
> > "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 
> > afterwards!" 
> > 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 
> PETScWrappers::MPI::Vector). 
> -- 
> Timo Heister 
> http://www.math.clemson.edu/~heister/ 

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