Thanks Daniel, it worked.
On Wednesday, July 10, 2019 at 9:59:08 PM UTC-4, Daniel Arndt wrote:
>
> Vivek,
>
> just remove the line
> if (i->first >= range.first && i->first < range.second)
> VectorTools::interpolate_boundary_values should only set values for
> locally active degrees of freedom anyway.
> As long as the values are consistent between different processes, this
> should work just fine.
>
> Best,
> Daniel
>
>
> Am Mi., 10. Juli 2019 um 20:02 Uhr schrieb Vivek Kumar <vivek...@gmail.com
> <javascript:>>:
>
>> Hi all,
>>
>> I had a legacy code were PETScWrappers::MPI::Vectors were used to for
>> parallel computing. For very large problems, I was told to move to
>> Trilinos. It was fairly easy to do so for most part of the code but I am
>> stuck in the implementation of boundary values. Currently the boundary
>> values are implemented as follows:
>>
>> template<int dim>
>> void ElasticityEquation<dim>::apply_boundary_conditions(const double
>> time, const double velocity)
>> {
>> // Begin timer
>> TimerOutput::Scope t(computing_timer, "Apply Boundary Condition");
>>
>> boundary_values.clear();
>> VectorTools::interpolate_boundary_values
>> (dof_handler,2,ZeroFunction<dim>(dim),boundary_values);
>>
>> VectorTools::interpolate_boundary_values
>> (dof_handler,3,BoundaryValues<dim>(time, velocity) , boundary_values);
>> // The range of owned dofs
>> std::pair<unsigned int, unsigned int> range = solution.local_range();
>>
>> // Set the boundary conditions
>> for (typename std::map<unsigned int, double>::const_iterator i =
>> boundary_values.begin(); i != boundary_values.end(); ++i){
>> if (i->first >= range.first && i->first < range.second){
>> completely_distributed_solution(i->first) = i->second;
>> }
>> }
>>
>> completely_distributed_solution.compress(VectorOperation::insert);
>>
>> hanging_constraints.distribute( completely_distributed_solution);
>>
>> solution = completely_distributed_solution;
>> }
>>
>>
>> This used to work fine with PETSc but not with Trilinos. The issue seems
>> to be the fact the Trilinos does not arrange the vector contiguous ranges
>> of elements (
>> https://www.dealii.org/current/doxygen/deal.II/classTrilinosWrappers_1_1MPI_1_1Vector.html#abcc22742227d63950cb0995223e6ee32)
>>
>> . Is there a standard workaround?
>>
>> Thanks
>> Vivek
>>
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