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- W2056487966 abstract "A hybrid-parallel direct-numerical-simulation method with application to turbulent Taylor-Couette flow is presented. The Navier-Stokes equations are discretized in cylindrical coordinates with the spectral Fourier-Galerkin method in the axial and azimuthal directions, and high-order finite differences in the radial direction. Time is advanced by a second-order, semi-implicit projection scheme, which requires the solution of five Helmholtz/Poisson equations, avoids staggered grids and renders very small slip velocities. Nonlinear terms are computed with the pseudospectral method. The code is parallelized using a hybrid MPI-OpenMP strategy, which is simpler to implement, reduces inter-node communications and is more efficient compared to a flat MPI parallelization. A strong scaling study shows that the hybrid code maintains very good scalability up to more than 20000 processor cores and thus allows to perform simulations at higher resolutions than previously feasible, and opens up the possibility to simulate turbulent Taylor-Couette flows at Reynolds numbers up to $mathcal{O}(10^5)$. This enables to probe hydrodynamic turbulence in Keplerian flows in experimentally relevant regimes." @default.
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- W2056487966 date "2015-01-01" @default.
- W2056487966 modified "2023-10-15" @default.
- W2056487966 title "A hybrid MPI-OpenMP parallel implementation for pseudospectral simulations with application to Taylor–Couette flow" @default.
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- W2056487966 doi "https://doi.org/10.1016/j.compfluid.2014.09.021" @default.
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