The Proceedings of the Fluids engineering conference
Online ISSN : 2424-2896
2018
Session ID : OS15-7
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Influence of grid resolution in large-eddy simulation of a turbulent pipe flow using the WALE model
*Daiki IWASAYusuke NABAEKoji FUKAGATA
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Abstract

For large-eddy simulation (LES) of turbulent flow within a realistic computational time, assessment of the accuracy of subgrid scale model, especially in the case where the computational grid is very coarse is of significant importance. We perform a comprehensive grid resolution study of the WALE model in a turbulent pipe flow. The LES is performed under a constant flow rate at the bulk Reynolds number of 5300. The results show that the turbulent statistics such as the mean velocity profiles and the second order moments significantly depend on the spanwise grid resolution, while less sensitive to the streamwise grid resolution. Moreover, the statistics are reasonably well reproduced using only 6 computational points in the radial direction if only the first computational point is located within 5 wall units from the wall.

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© 2018 The Japan Society of Mechanical Engineers
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