An Accelerated 3D Navier–Stokes Solver for Flows in Turbomachines

Brandvik, Tobias; Pullan, Graham

doi:10.1115/1.4001192

Cited by 112 publications

(40 citation statements)

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“…LBM relies on a kinetic description which also makes the modelled physics simpler than with Navier-Stokes codes. Indeed, an LBM solver requires less lines of code, which is an asset when it must be adapted to new computing paradigms (for example to GPU [82]). Recent works have also shown that LBM is compatible with an LES framework [83].…”

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confidence: 99%

Large eddy simulation of flows in industrial compressors: a path from 2015 to 2035

Gourdain

Sicot

Duchaine

et al. 2014

Phil. Trans. R. Soc. A.

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One contribution of 13 to a Theme Issue 'Aerodynamics, computers and the environment' . A better understanding of turbulent unsteady flows is a necessary step towards a breakthrough in the design of modern compressors. Owing to high Reynolds numbers and very complex geometry, the flow that develops in such industrial machines is extremely hard to predict. At this time, the most popular method to simulate these flows is still based on a Reynoldsaveraged Navier-Stokes approach. However, there is some evidence that this formalism is not accurate for these components, especially when a description of time-dependent turbulent flows is desired. With the increase in computing power, large eddy simulation (LES) emerges as a promising technique to improve both knowledge of complex physics and reliability of flow solver predictions. The objective of the paper is thus to give an overview of the current status of LES for industrial compressor flows as well as to propose future research axes regarding the use of LES for compressor design. While the use of wallresolved LES for industrial multistage compressors at realistic Reynolds number should not be ready before 2035, some possibilities exist to reduce the cost of LES, such as wall modelling and the adaptation of the phase-lag condition. This paper also points out the necessity to combine LES to techniques able to tackle complex geometries. Indeed LES alone, i.e. without prior knowledge of such flows for grid construction or the prohibitive yet ideal use of fully homogeneous meshes to predict compressor flows, is quite limited today. IntroductionThe aeronautic industry faces a formidable challenge by targeting in 2050 a reduction of CO 2 and NO x 2014 The Author(s) Published by the Royal Society. All rights reserved. emissions by 75% and 90% per kilometre and per passenger, respectively (compared to the 2000 level). Ultra-high bypass ratio (BR > 20) turbofan and ultra-high overall pressure ratio (OPR > 70) core engines have the potential for such significant reductions in fuel burn. However, after many years of optimization, the design of ever more efficient gas turbines now requires understanding of the complex unsteady flow appearing within each individual component and in an integrated fashion. Among all components, the compressor remains a critical part of a gas turbine, especially regarding its efficiency and stability. Owing to the adverse pressure gradients, compressors are naturally subjected to unstable flows such as surge and rotating stall [1], which can potentially lead to mechanical failure. These aerodynamic instabilities impose serious constraints on the design (the so-called 'surge margin') and thus on performance. In this context, maximizing the efficiency of compressors remains particularly complex and the improvement of the compressor robustness and performance thus requires good understanding of the flow physics.Complementary to experimental investigations, the numerical simulation of flows, commonly referred to as computational fluid dynamics (CFD), is...

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confidence: 99%

Large eddy simulation of flows in industrial compressors: a path from 2015 to 2035

Gourdain

Sicot

Duchaine

et al. 2014

Phil. Trans. R. Soc. A.

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“…In other work by Brandvik and Pullan [4]; the researchers presented a 3D NS solver on multiple GPUs with MPI. The subroutines for MPI were formulated using Python language.…”

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confidence: 99%

“…4 shows a schematic of how on the hardware the CUDA program is executed; the programming structure of CUDA is explained in the flowchart inFigure 8.5.…”

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Graphics Processing Unit Technology

Jamshed¹

2015

Using HPC for Computational Fluid Dynamics

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“…These features have motivated a large body of studies, in the area of general purpose computing on GPUs (GPGPU). Recent developments in the use of GPGPU applications in Computational Fluid Dynamics (CFD) [5][6][7][8][9][10][11][12][13] have encouraged us to extend these efforts to the CAA field. The application of GPU computing in CAA field is quite new and there are only a few study cases to the authors' knowledge.…”

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confidence: 99%