Overlapping of Communication and Computation in nb3dfft for 3D Fast Fourier Transformations

Göbbert, Jens Henrik; Iliev, Hristo; Ansorge, Cedrick; Pitsch, Heinz

doi:10.1007/978-3-319-53862-4_13

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…The simulations used more than 1.8 Million concurrent threads and have been carried out on the super-computer JUQUEEN at research center Juelich [46]. More details about the numerical procedure and the parallelization strategy are given by Gauding et al [14,16] and Goebbert et al [18,19]. A necessary constraint that has to be satisfied by the DNS is an adequate resolution of all relevant scales.…”

Section: Direct Numerical Simulationsmentioning

confidence: 99%

On the self-similarity of line segments in decaying homogeneous isotropic turbulence

et al. 2019

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The self-similarity of a passive scalar in homogeneous isotropic decaying turbulence is investigated by the method of line segments (M. Gauding et al., Physics of Fluids 27.9 (2015): 095102). The analysis is based on a highly resolved direct numerical simulation of decaying turbulence. The method of line segments is used to perform a decomposition of the scalar field into smaller sub-units based on the extremal points of the scalar along a straight line. These sub-units (the so-called line segments) are parameterized by their length and the difference ∆φ of the scalar field between the ending points. Line segments can be understood as thin local convective-diffusive structures in which diffusive processes are enhanced by compressive strain. From DNS, it is shown that the marginal distribution function of the length assumes complete self-similarity when re-scaled by the mean length m . The joint statistics of ∆φ and , from which the local gradient g = ∆φ/ can be defined, play an important role in understanding the turbulence mixing and flow structure. Large values of g occur at a small but finite length scale. Statistics of g are characterized by rare but strong deviations that exceed the standard deviation by more than one order of magnitude. It is shown that these events break complete self-similarity of line segments, which confirms the standard paradigm of turbulence that intense events (which are known as internal intermittency) are not self-similar.

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Section: Direct Numerical Simulationsmentioning

confidence: 99%

On the self-similarity of line segments in decaying homogeneous isotropic turbulence

et al. 2019

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“…The DNS of the non-reactive flow is performed by solving the non-dimensional unsteady incompressible Navier–Stokes equations employing the in-house Solver psDNS (Göbbert et al. 2017). Additionally, an advection–diffusion equation is solved for a passive scalar.…”

Section: Configurations and Numerical Methodsmentioning

confidence: 99%

Dissipation element analysis of non-premixed jet flames

et al. 2020

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“…For the overlapping of communication and computation done for FFTs and other applications, a non‐blocking version of our all‐to‐all algorithm is desirable. We introduce here a simple non‐blocking version of it.…”

Section: Methodsmentioning

confidence: 99%

Optimized all‐to‐all communication on multicore architectures applied to FFTs with pencil decomposition

Jocksch¹,

Kraushaar²,

Daverio

2018

Concurrency and Computation

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Summary All‐to‐all communication is a basic functionality of parallel communication libraries such as the Message Passing Interface (MPI). Typically, there are multiple different underlying algorithms, which are chosen according to message size. We propose a communication algorithm, which exploits the fact that modern supercomputers combine shared memory parallelism and distributed memory parallelism. The application example of our algorithm is FFTs with pencil decomposition. Furthermore, we propose an extension of the MPI standard in order to accommodate this and other algorithms in an efficient way.

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Overlapping of Communication and Computation in nb3dfft for 3D Fast Fourier Transformations

Cited by 6 publications

References 4 publications

On the self-similarity of line segments in decaying homogeneous isotropic turbulence

On the self-similarity of line segments in decaying homogeneous isotropic turbulence

Dissipation element analysis of non-premixed jet flames

Optimized all‐to‐all communication on multicore architectures applied to FFTs with pencil decomposition

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