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add computeVolumeIntegral function #597

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Apr 8, 2024
Merged

add computeVolumeIntegral function #597

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29 changes: 29 additions & 0 deletions src/simulation.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -307,6 +307,9 @@ template <typename problem_t> class AMRSimulation : public amrex::AmrCore

template <typename ReduceOp, typename F> auto computePlaneProjection(F const &user_f, int dir) const -> amrex::BaseFab<amrex::Real>;

// compute volume integrals
template <typename F> auto computeVolumeIntegral(F const &user_f) -> amrex::Real;

// I/O functions
[[nodiscard]] auto PlotFileName(int lev) const -> std::string;
[[nodiscard]] auto CustomPlotFileName(const char *base, int lev) const -> std::string;
Expand Down Expand Up @@ -1958,6 +1961,32 @@ template <typename problem_t> void AMRSimulation<problem_t>::AverageDownTo(int c
}
}

template <typename problem_t> template <typename F> auto AMRSimulation<problem_t>::computeVolumeIntegral(F const &user_f) -> amrex::Real
{
// compute integral of user_f(i, j, k, state) along the given axis.
const BL_PROFILE("AMRSimulation::computeVolumeIntegral()");

// allocate temporary multifabs
amrex::Vector<amrex::MultiFab> q;
q.resize(finest_level + 1);
for (int lev = 0; lev <= finest_level; ++lev) {
q[lev].define(boxArray(lev), DistributionMap(lev), 1, 0);
}

// evaluate user_f on all levels
// (note: it is not necessary to average down)
for (int lev = 0; lev <= finest_level; ++lev) {
auto const &state = state_new_cc_[lev].const_arrays();
auto const &result = q[lev].arrays();
amrex::ParallelFor(q[lev], [=] AMREX_GPU_DEVICE(int bx, int i, int j, int k) { result[bx](i, j, k) = user_f(i, j, k, state[bx]); });
}
amrex::Gpu::streamSynchronize();

// call amrex::volumeWeightedSum
const amrex::Real result = amrex::volumeWeightedSum(amrex::GetVecOfConstPtrs(q), 0, geom, ref_ratio);
return result;
}

#ifdef AMREX_PARTICLES
template <typename problem_t> void AMRSimulation<problem_t>::InitParticles()
{
Expand Down