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Incompact3D.md

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title description published date tags editor dateCreated
Incompact3D
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2022-03-27 19:33:07 UTC
markdown
2022-03-21 02:23:03 UTC

Incompact3D

It's the incompressible Navier–Stokes equations using sixth-order compact schemes for spatial discretization. It basically implement a ODE with numerical methods called Multistep Methods.

the Poisson equation is fully solved in spectral space using Fast Fourier Transform (FFT) routines

incopmact_3d_verstility

Intro to the algorithm and implementation

mpi_affinity

2d_mpi_affinity

Test Case Taylor

Build for MKL/FFTW3

Reminder:

  1. Enable MKL speedup on AMD Platform
int mkl_serv_intel_cpu_true() {
	return 1;
}
  1. FFTW3 migrate to CuFFT.

Build libnpc with spack

I don't know why...it fails to build when MPICXX is set...

Here is a quick hack

class Libnbc(AutotoolsPackage):
    """LibNBC is a prototypic implementation of a nonblocking
    interface for MPI collective operations. Based on ANSI C and
    MPI-1, it supports all MPI-1 collective operations in a
    nonblocking manner. LibNBC is distributed under the BSD license.
    """
    homepage = "http://unixer.de/research/nbcoll/libnbc/"
    url      = "http://unixer.de/research/nbcoll/libnbc/libNBC-1.1.1.tar.gz"

    version('1.1.1', sha256='63aa5f75f84c191da0688cb551ebd0e9e46928edfba350b2a534eb0c704dd9c3')

    depends_on("mpi")

+   def configure_args(self):
+       args = []
+       args.append("MPICXX=")
+       return args

Reference

  1. Incompact3d: A powerful tool to tackle turbulence problems with up to \(O\left(10^{5}\right)\) computational cores