swMATH ID: 35262
Software Authors: Costa, Pedro
Description: A FFT-based finite-difference solver for massively-parallel direct numerical simulations of turbulent flows. We present an efficient solver for massively-parallel direct numerical simulations of incompressible turbulent flows. The method uses a second-order, finite-volume pressure-correction scheme, where the pressure Poisson equation is solved with the method of eigenfunction expansions. This approach allows for very efficient FFT-based solvers in problems with different combinations of homogeneous pressure boundary conditions. Our algorithm explores all combinations of pressure boundary conditions valid for such a solver, in a single, general framework. The method is implemented in a 2D pencil-like domain decomposition, which enables efficient massively-parallel simulations. The implementation was validated against different canonical flows, and its computational performance was examined. Excellent strong scaling performance up to (10^4) cores is demonstrated for a domain with (10^9) spatial degrees of freedom, corresponding to a very small wall-clock time/time step. The resulting tool, CaNS, has been made freely available and open-source.
Homepage: https://arxiv.org/abs/1802.10323
Keywords: direct numerical simulations; turbulent flows; high-performance computing; fast Poisson solver
Related Software: 2DECOMP; FFTW; PoisFFT; AFiD_GPU; hypre; Fluid flow phenomena; AFiD; incompact3d; HERCULES; PFFT; P3DFFT; HOLOMAC; GitHub; STREAmS; SNaC; MPI; TURBINS; Nek5000; FS3D; Gerris
Cited in: 17 Documents

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