Hi Dmitry,
you want to only iterate over the internal cells to not sum up things twice on
the process boundary, to this end use
for (const auto& element : elements(this->gridGeometry().gridView(),
Dune::Partitions::interior))
After the loop you actually have to sum up over the process if you want the
summed result, e.g. try
const auto& comm = this->gridGeometry().gridView().comm();
for (int i = 0; i < FluidSystem::numComponents; ++i)
fluxes[i] = comm.sum(fluxes[i]);
Best wishes
Timo
> On 18. Nov 2021, at 13:40, Dmitry Pavlov <dmitry.pav...@outlook.com> wrote:
>
> Hello,
>
> I have the following code to compute and add up fluxes through boundary cells
> of certain type after each step:
>
>
> Scalar fluxes[FluidSystem::numComponents] = {0};
>
> for (const auto& element :
> elements(this->gridGeometry().gridView()))
> {
> auto fvGeometry = localView(this->gridGeometry());
> fvGeometry.bindElement(element);
>
> auto elemVolVars = localView(gridVariables.curGridVolVars());
> elemVolVars.bind(element, fvGeometry, curSol);
>
> auto elemFluxVarsCache =
> localView(gridVariables.gridFluxVarsCache());
>
> for (auto&& scvf : scvfs(fvGeometry))
> {
> if (scvf.boundary())
> {
> const auto boundaryMarkerId =
> gridDataPtr_->getBoundaryDomainMarker(scvf.boundaryFlag());
>
> if (boundaryMarkerId == 888)
> {
> auto neumannFluxes = neumann(element, fvGeometry,
> elemVolVars, elemFluxVarsCache, scvf);
> neumannFluxes *= scvf.area() *
> elemVolVars[scvf.insideScvIdx()].extrusionFactor();
>
> for (int i = 0; i < FluidSystem::numComponents; i++)
> fluxes[i] += neumannFluxes[i];
> }
> }
> }
> }
>
>
> It works in single-process mode but not in multi-process. I think this has to
> do with the grid being divided between processes? How do I adapt this
> post-processing code to this scheme?
>
>
> Best regards,
>
> Dmitry
>
>
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