Direct Numerical Simulation and Large Eddy Simulation on a Turbulent Wall-Bounded Flow Using Lattice Boltzmann Method and Multiple GPUsReport as inadecuate




Direct Numerical Simulation and Large Eddy Simulation on a Turbulent Wall-Bounded Flow Using Lattice Boltzmann Method and Multiple GPUs - Download this document for free, or read online. Document in PDF available to download.

Mathematical Problems in Engineering - Volume 2014 2014, Article ID 742432, 10 pages -

Research Article

State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, 28 Xianning West Road, Xi-an 710049, China

Global Scientific Information and Computing Center, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Department of Physics, Keio University, 4-1-1 Hiyoshi, Kouhoku-ku, Yokohama 223-8521, Japan

Received 4 January 2014; Accepted 11 February 2014; Published 14 April 2014

Academic Editor: Gongnan Xie

Copyright © 2014 Xian Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Direct numerical simulation DNS and large eddy simulation LES were performed on the wall-bounded flow at using lattice Boltzmann method LBM and multiple GPUs Graphic Processing Units. In the DNS, 8 K20M GPUs were adopted. The maximum number of meshes is , which results in the nondimensional mesh size of for the whole solution domain. It took 24 hours for GPU-LBM solver to simulate LBM steps. The aspect ratio of resolution domain was tested to obtain accurate results for DNS. As a result, both the mean velocity and turbulent variables, such as Reynolds stress and velocity fluctuations, perfectly agree with the results of Kim et al. 1987 when the aspect ratios in streamwise and spanwise directions are 8 and 2, respectively. As for the LES, the local grid refinement technique was tested and then used. Using grids and Smagorinsky constant , good results were obtained. The ability and validity of LBM on simulating turbulent flow were verified.





Author: Xian Wang, Yanqin Shangguan, Naoyuki Onodera, Hiromichi Kobayashi, and Takayuki Aoki

Source: https://www.hindawi.com/



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