Dynamic load balancing for direct-coupled multiphysics simulations

Niemöller, Ansgar; Schlottke-Lakemper, Michael; Meinke, Matthias; Schröder, Wolfgang

doi:10.1016/j.compfluid.2020.104437

Cited by 22 publications

(6 citation statements)

References 31 publications

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“…Hybrid methods utilize acoustic analogies as first introduced in the seminal papers of Lighthill [34,35]. The recent state-of-the-art is highlighted by the work of Schlottke-Lakemper et al [36], who proposed a run-time coupled massive parallel hybrid APE-4/compressible LES solver on hierarchical meshes [37].…”

Section: Low Subsonic Performance Characteristics Of Has and Dncmentioning

confidence: 99%

Hydrodynamic/acoustic splitting approach with flow-acoustic feedback for universal subsonic noise computation

Ewert

Kreuzinger²

2021

Journal of Computational Physics

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A generalized approach to decompose the compressible Navier-Stokes equations into an equivalent set of coupled equations for flow and acoustics is introduced. As a significant extension to standard hydrodynamic/acoustic splitting methods, the approach provides the essential coupling terms, which account for the feedback from the acoustics to the flow. A unique simplified version of the split equation system with feedback is derived that conforms to the compressible Navier-Stokes equations in the subsonic flow regime, where the feedback reduces to one additional term in the flow momentum equation. Subsonic simulations are conducted for flow-acoustic feedback cases using a scale-resolving run-time coupled hierarchical Cartesian mesh solver, which operates with different explicit time step sizes for incompressible flow and acoustics. The first simulation case focuses on the tone of a generic flute. With the major flow-acoustic feedback term included, the simulation yields the tone characteristics in agreement with reference results from Kühnelt [1] based on Lattice-Boltzmann simulation. On the contrary, the standard hybrid hydrodynamic/acoustic method with the feedback-term switched off lacks the proper tone. As the second simulation case, a thick plate in a duct is studied at various low Mach numbers around the Parker-β-mode resonance. The simulations reveal the flow-acoustic feedback mechanism in very good agreement with experimental data of Welsh et al. [2]. Simulations and theoretical considerations reveal that the feedback term does not reduce the stable convective flow based time step size of the flow equations.

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Section: Low Subsonic Performance Characteristics Of Has and Dncmentioning

confidence: 99%

Hydrodynamic/acoustic splitting approach with flow-acoustic feedback for universal subsonic noise computation

Ewert

Kreuzinger²

2021

Journal of Computational Physics

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“…Figure 14(a) also shows the scalability of a coupled and load-balanced simulation for a full production simulation of a turbulent jet. The computational mesh consists of 57.3 • 10 6 and 3.71 • 10 6 cells for the CFD and CAA parts (Niemöller et al 2020). For the latter, the polynomial degree is chosen to be N = 3, which leads to ≈237.4 • 10 6 degrees of freedom.…”

Section: Finite-volume and Moving Boundary Computations With Dynamic mentioning

confidence: 99%

“…Results of a performance analysis of the DG and DG-FV-coupled methods, and of an aeroacoustic jet simulation. (a) Scalability of the standalone DG solver on HAZEL HEN at HLRS Stuttgart and on JUQUEEN at JSC Jülich(Schlottke-Lakemper et al 2017), as well as of the coupled and load-balanced DG-FV method on HAZEL HEN(Niemöller et al 2020) and (b) results of a coupled FV-DG aeroacoustic jet simulation(Cetin et al 2015). Acoustic pressure contours are shown.…”

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confidence: 99%

Zonal Flow Solver (ZFS): a highly efficient multi-physics simulation framework

Lintermann

Meinke

Schröder

2020

International Journal of Computational Fluid Dynamics

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Multi-physics simulations are at the heart of today's engineering applications. The trend is towards more realistic and detailed simulations, which demand highly resolved spatial and temporal scales of various physical mechanisms to solve engineering problems in a reasonable amount of time. As a consequence, numerical codes need to run efficiently on high-performance computers. Therefore, the framework Zonal Flow Solver (ZFS) featuring lattice-Boltzmann, finite-volume, discontinuous Galerkin, level set and Lagrange solvers has been developed. The solvers can be combined to simulate, e.g. quasi-incompressible and compressible flow, aeroacoustics, moving boundaries and particle dynamics. In this manuscript, the multi-physics implementation of the coupling mechanisms are presented. The parallelisation approach, the involved solvers and their scalability on state-of-theart heterogeneous high-performance computers are discussed. Various multi-physics applications complement the discussion. The results show ZFS to be a highly efficient and flexible multipurpose tool that can be used to solve varying classes of coupled problems.

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“…Therefore, a direct-hybrid CFD/CAA method is implemented, in which an LB method is used for the flow field prediction being coupled to a discontinuous Galerkin scheme for the solution of the APE. The coupling strategy is similar as for a finitevolume solver for the Navier-Stokes equations, which has been developed previously in [1,3]. For the first time, the accuracy is discussed for the two directly coupled CFD/ CAA methods, i.e., the LB-DG and the FV-DG method.…”

Section: Introductionmentioning

confidence: 99%

A direct-hybrid CFD/CAA method based on lattice Boltzmann and acoustic perturbation equations

et al. 2023

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The accuracy of two direct coupled two-step CFD/CAA methods is discussed. For the flow field either a finite-volume (FV) method for the solution of the Navier–Stokes equations or a lattice Boltzmann (LB) method is coupled to a discontinuous Galerkin (DG) method for the solution of the acoustic perturbation equations. The coupling takes advantage of a joint Cartesian mesh allowing for the exchange of the acoustic sources without MPI communication. An immersed boundary treatment of the acoustic scattering from solid bodies by a novel solid wall formulation is implemented and validated in the DG method. Results for the case of a spinning vortex pair and the low Reynolds number unsteady flow around a circular cylinder show that a solution with comparable accuracy is obtained for the two direct-hybrid methods when using identical mesh resolution.

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Dynamic load balancing for direct-coupled multiphysics simulations

Cited by 22 publications

References 31 publications

Hydrodynamic/acoustic splitting approach with flow-acoustic feedback for universal subsonic noise computation

Hydrodynamic/acoustic splitting approach with flow-acoustic feedback for universal subsonic noise computation

Zonal Flow Solver (ZFS): a highly efficient multi-physics simulation framework

A direct-hybrid CFD/CAA method based on lattice Boltzmann and acoustic perturbation equations

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