Add scaling for non-cubic rectangular geometries, remove mean velocit… #170
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,89 +1,103 @@ | ||
| #include <AMReX.H> | ||
| #include <AMReX_FFT.H> | ||
| #include <AMReX_ParmParse.H> | ||
| #include <AMReX_PlotFileUtil.H> | ||
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| using namespace amrex; | ||
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| int main(int argc, char *argv[]) { | ||
| amrex::Initialize(argc, argv); | ||
| { | ||
| std::string infile("plot"); | ||
| std::string outfile("spectrum.txt"); | ||
| Vector<std::string> vel_labels = {AMREX_D_DECL("velx", "vely", "velz")}; | ||
| ParmParse pp; | ||
| pp.query("infile", infile); | ||
| pp.query("outfile", outfile); | ||
| pp.queryarr("vel_labels", vel_labels, 0, 3); | ||
| Geometry geom; | ||
| MultiFab vx, vy, vz; | ||
| Vector<Real> scaleL(3); | ||
| { | ||
| PlotFileData plot(infile); | ||
| geom.define(plot.probDomain(0), RealBox(plot.probLo(), plot.probHi()), | ||
| plot.coordSys(), {1, 1, 1}); | ||
| // Read data, remove mean field | ||
| vx = plot.get(0, vel_labels[0]); | ||
| vx.mult(1. / vx.sum(0, 0)); | ||
| vy = plot.get(0, vel_labels[1]); | ||
| vy.mult(1. / vy.sum(0, 0)); | ||
| vz = plot.get(0, vel_labels[2]); | ||
| vz.mult(1. / vz.sum(0, 0)); | ||
| Real L = std::min( | ||
| {geom.ProbLength(0), geom.ProbLength(1), geom.ProbLength(2)}); | ||
| scaleL = {AMREX_D_DECL(1. / std::round(geom.ProbLength(0) / L), | ||
| 1. / std::round(geom.ProbLength(1) / L), | ||
| 1. / std::round(geom.ProbLength(2) / L))}; | ||
| } | ||
| cMultiFab cx, cy, cz; | ||
| { | ||
| // Note that the complex Hermitian output array Y has (nx/2+1,ny,nz) | ||
| // elements. Y[nx-i,j,k] = Y[i,j,k]* | ||
| FFT::R2C<Real, FFT::Direction::forward> fft(geom.Domain()); | ||
| auto const &[ba, dm] = fft.getSpectralDataLayout(); | ||
| cx.define(ba, dm, 1, 0); | ||
| cy.define(ba, dm, 1, 0); | ||
| cz.define(ba, dm, 1, 0); | ||
| fft.forward(vx, cx); | ||
| fft.forward(vy, cy); | ||
| fft.forward(vz, cz); | ||
| } | ||
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| // For simplicity, we are not going to worry about scaling. | ||
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| int nx = geom.Domain().length(0); | ||
| int ny = geom.Domain().length(1); | ||
| int nz = geom.Domain().length(2); | ||
| int nk = nx; | ||
| Gpu::DeviceVector<Real> ke(nk, Real(0.0)); | ||
| Real *pke = ke.data(); | ||
| auto const &cxa = cx.const_arrays(); | ||
| auto const &cya = cy.const_arrays(); | ||
| auto const &cza = cz.const_arrays(); | ||
| ParallelFor(cx, [=] AMREX_GPU_DEVICE(int b, int i, int j, int k) { | ||
| int ki = i; | ||
| int kj = (j <= ny / 2) ? j : ny - j; | ||
| int kk = (k <= nz / 2) ? k : nz - k; | ||
| Real d = std::sqrt(Real(ki * ki * scaleL[0] + kj * kj * scaleL[1] + | ||
| kk * kk * scaleL[2])); | ||
| int di = int(std::round(d)); | ||
| if (di < nk) { | ||
| Real value = amrex::norm(cxa[b](i, j, k)) + | ||
| amrex::norm(cya[b](i, j, k)) + | ||
| amrex::norm(cza[b](i, j, k)); | ||
| // Account for Hermitian symmetry in x-direction | ||
| // Hermitian symmetry Y[nx-i,j,k] = Y[i,j,k]* | ||
| if ((i > 0) && (2 * i != nx)) { | ||
| // Multiply by 2 because we have +ki and -ki | ||
| value *= Real(2.0); | ||
| } | ||
| HostDevice::Atomic::Add(pke + di, value); | ||
| } | ||
| }); | ||
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| #ifdef AMREX_USE_GPU | ||
| Gpu::HostVector<Real> ke_h(ke.size()); | ||
| Gpu::copyAsync(Gpu::deviceToHost, ke.begin(), ke.end(), ke_h.begin()); | ||
| Gpu::streamSynchronize(); | ||
| Real *pke_h = ke_h.data(); | ||
| #else | ||
| Real *pke_h = pke; | ||
| #endif | ||
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| ParallelDescriptor::ReduceRealSum(pke_h, nk); | ||
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| if (ParallelDescriptor::IOProcessor()) { | ||
| std::ofstream ofs(outfile.c_str()); | ||
|
Member
There was a problem hiding this comment. No need to use c_str, because ofstream takes std::string. |
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| for (int i = 0; i < nk; ++i) { | ||
| ofs << i << " " << pke_h[i] << "\n"; | ||
| } | ||
| } | ||
| } | ||
| amrex::Finalize(); | ||
| } | ||
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