A Wall-Modeled LES Perspective for the High Lift Common Research Model Using LAVA

Ghate, Aditya S.; Stich, Gerrit-Daniel; Kenway, Gaetan K.; Housman, Jeffrey A.; Kiris, Cetin C.

doi:10.2514/6.2022-3434

Cited by 13 publications

(2 citation statements)

References 30 publications

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“…To conclude this analysis, let us compare the present results with the performance reported in the literature for advanced 3D CFD solvers. Interestingly, these solvers typically take about 1 to 5 ms of CPU-core time to update one cell, [120][121][122] which corresponds to a performance of 0.2 to 1 MLUPS. By moving to GPUs, these solvers usually benefit from a speedup of 5 to 20 between a single cluster-class GPU card and a full CPU node.…”

Section: Performance Analysismentioning

confidence: 99%

Exponential distribution functions for positivity-preserving lattice Boltzmann schemes: Application to 2D compressible flow simulations

Thyagarajan,

Coreixas,

Latt

2023

Physics of Fluids

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A family of positivity-preserving lattice Boltzmann methods (LBMs) is proposed for compressible flow simulations in the continuum regime. It relies on the efficient collide-and-stream algorithm with a collision step based on exponential distribution functions. The latter serves as a generalization of Grad's post-collision distribution functions for which here (1) the linearized non-equilibrium contributions are replaced by their exponential forms and (2) the number of these contributions can be chosen arbitrary. In practice, post-collision moments of our exponential formulation are enforced through an iterative moment-matching approach to recover any macroscopic physics of interest, with or without external forces. This methodology directly flows from the extended framework on numerical equilibria [J. Latt et al., Philos. Trans. R. Soc. A 378, 20190559 (2020)] and goes one step further by allowing for the independent relaxation of hydrodynamic and high-order modes in a given moment space, notably, making the Prandtl number freely adjustable. The model is supplemented by a shock-capturing technique, based on the deviation of non-equilibrium moments from their equilibrium counterparts, to ensure good numerical properties of the model in inviscid and under-resolved conditions. A second exponential distribution accounts for extra degrees of freedom of molecules and allows for the simulation of polyatomic gases. To validate this novel approach and to quantify the accuracy of different lattices and moment closures, several 2D benchmark tests of increasing complexity are considered: double shear layer, linear wave decay, Poiseuille flow, Riemann problem, compressible Blasius flow over a flat plate, and supersonic flow past an airfoil. Corresponding results confirm the accuracy and stability properties of our approach for the simulation of compressible flows with LBMs. Eventually, the performance analysis further highlights its efficiency on general purpose graphical processing units.

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Section: Performance Analysismentioning

confidence: 99%

Exponential distribution functions for positivity-preserving lattice Boltzmann schemes: Application to 2D compressible flow simulations

Thyagarajan,

Coreixas,

Latt

2023

Physics of Fluids

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“…Firstly, with regard to the issue of meshing, although the use of unstructured meshes is becoming increasingly attractive owing to automated pre-processing tools, it has been shown that computation-wise, codes relying on structured meshes still enjoy unrivalled performances [2]. However, the generation of structured meshes remains very cumbersome and can take many months even for an expert on a configuration as complex as the HL-CRM [3]. As a means to reduce the mesh generation effort, overset grid methods [4][5][6][7] (also referred to as "Chimera" methods [8]) have been used for many years in the CFD community, in particular for structured grids.…”

Section: Introductionmentioning

confidence: 99%

A hybrid lattice Boltzmann - Navier-Stokes method on overset grids

Suss

Mary

Garrec

et al. 2023

AIAA AVIATION 2023 Forum

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This paper presents an overset grid strategy in the context of a hybrid lattice Boltzmann -Navier-Stokes method for unsteady aerodynamic and aeroacoustic applications. While the overset grid approach is usually used to couple multiple overlapping grids with different mesh topologies together through interpolations, it is proposed to extend this methodology by enabling to switch between numerical methods across the grids making up the computational domain. Thereby, one can reach nearly optimal running conditions in terms of meshing strategy and numerical properties for the simulation of high Reynolds number flows. The key feature of this work lies in the way the information exchange is performed at the interface between the lattice Boltzmann method (applied on Cartesian grids) and the finite-volume Navier-Stokes method (dedicated to curvilinear meshes). All the numerical aspects of the coupling procedure are thoroughly discussed and the developed strategy is assessed on unsteady test cases representative of aerodynamic and aeroacoustic problems.

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Direct- and Large Eddy Simulations of Turbulent Flow in CS0 Diffuser on Resolved and Under-resolved Meshes

Menter

Kolmogorov

Garbaruk

et al. 2023

Flow Turbulence Combust

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A Wall-Modeled LES Perspective for the High Lift Common Research Model Using LAVA

Cited by 13 publications

References 30 publications

Exponential distribution functions for positivity-preserving lattice Boltzmann schemes: Application to 2D compressible flow simulations

Exponential distribution functions for positivity-preserving lattice Boltzmann schemes: Application to 2D compressible flow simulations

A hybrid lattice Boltzmann - Navier-Stokes method on overset grids

Direct- and Large Eddy Simulations of Turbulent Flow in CS0 Diffuser on Resolved and Under-resolved Meshes

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