Multi GPU Implementation to Accelerate the CFD Simulation of a 3D Turbo-Machinery Benchmark Using the RapidCFD Library

Molinero, Daniel; Galván, Sergio; Pacheco, Juan de Jesús Cando; Herrera, Nicolas S.

doi:10.1007/978-3-030-38043-4_15

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…Due to the porting process, it features fewer linear solvers, turbulence models as well as boundary conditions than more recent versions of OF. Reasonable results with RANS models are shown by Nocente et al [7] and Molinero et al [8] for simulations of turbo-machinery and for a high speed flow by Kurashov [9]. These studies showed a remarkable increase in speed of up to nine times compared to CPU-based solvers, which makes GPU-ported solvers an attractive tool for solving computationally expensive CFD problems.…”

Section: Introductionmentioning

confidence: 99%

Hybrid LES/RANS simulations of a 90° pipe bend using different CFD solvers

Ekat,

Weissenbrunner,

Straka

et al. 2023

OpenFOAM J

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In this study, the performance of several RANS and hybrid LES/RANS turbulence models along with different CFD solvers (ANSYS Fluent, OpenFOAM and RapidCFD) is tested in terms of their ability to reproduce the flow downstream of a 90° pipe bend. The focus is on the temporal mean profiles downstream of the bend up to approximately 31 times the pipe's diameter D. The turbulence models' accuracy is evaluated by means of performance indicators and flow profiles in comparison to LDA measurements. The results demonstrate that the use of RANS models is suitable as long as the location of interest is in the vicinity of the bend up to approximately 10 D downstream of the bend. With increasing distance, the accuracy of the RANS models decreases, and the use of hybrid LES/RANS models is recommended.Three hybrid LES/RANS models are tested: the stress-blended eddy simulation (SBES) model as well as the Spalart-Allmaras-based and the k-omega SST-based improved delayed detached eddy simulation (IDDES) models. All three models show enhanced results for a distance to the bend >10 D. Additionally, it is found that in this geometry configuration, the IDDES models require a transient inlet. The flow separation due to the redirection inside the bend is too weak to generate turbulent fluctuations and a fast transition to full LES mode in the separation region. Due to the turbulent excitation at the inlet, the RANS region downstream of the bend is distinctly reduced, resulting in an enhanced performance of the hybrid IDDES models.

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Section: Introductionmentioning

confidence: 99%

Hybrid LES/RANS simulations of a 90° pipe bend using different CFD solvers

Ekat,

Weissenbrunner,

Straka

et al. 2023

OpenFOAM J

View full text Add to dashboard Cite

show abstract

“…However, the capabilities and limitations of CFD codes applied to turbomachinery problem solving have not been widely explored and thoroughly documented, even though it is a complex task [8]. Exceptions in this field are relatively few [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Turbomachinery GPU Accelerated CFD: An Insight into Performance

Molinero-Hernández,

Galván-González,

Herrera-Sandoval

et al. 2024

Computation

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Driven by the emergence of Graphics Processing Units (GPUs), the solution of increasingly large and intricate numerical problems has become feasible. Yet, the integration of GPUs into Computational Fluid Dynamics (CFD) codes still presents a significant challenge. This study undertakes an evaluation of the computational performance of GPUs for CFD applications. Two Compute Unified Device Architecture (CUDA)-based implementations within the Open Field Operation and Manipulation (OpenFOAM) environment were employed for the numerical solution of a 3D Kaplan turbine draft tube workbench. A series of tests were conducted to assess the fixed-size grid problem speedup in accordance with Amdahl’s Law. Additionally, tests were performed to identify the optimal configuration utilizing various linear solvers, preconditioners, and smoothers, along with an analysis of memory usage.

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Multi GPU Implementation to Accelerate the CFD Simulation of a 3D Turbo-Machinery Benchmark Using the RapidCFD Library

Cited by 2 publications

References 7 publications

Hybrid LES/RANS simulations of a 90° pipe bend using different CFD solvers

Hybrid LES/RANS simulations of a 90° pipe bend using different CFD solvers

Turbomachinery GPU Accelerated CFD: An Insight into Performance

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