ESTIMATING GRID SPACING IN LABORATORY-SCALE LARGE EDDY SIMULATIONS: INSIGHTS FROM THE KOLMOGOROV ENERGY SPECTRUM

Long DOAN SY; Chisato KOJIMA; Manabu KAWASHIMA; Hiroshi NODA

doi:10.14887/natsympwindengproc.28.0_13

Vol.28 (2024)

DOI https://doi.org/10.14887/natsympwindengproc.28.0_13

Conference information

Host: Japan Association for Wind Engineering

Co-host: Japan Society of Civil Engineers, Meteorological Society of Japan, Architectural Institute of Japan, Japanese Society of Steel Construction

Name : THE 28th NATIONAL SYMPOSIUM ON WIND ENGINEERING

Location : [in Japanese]

Date : December 02, 2024 - December 04, 2024

ESTIMATING GRID SPACING IN LABORATORY-SCALE LARGE EDDY SIMULATIONS:

INSIGHTS FROM THE KOLMOGOROV ENERGY SPECTRUM

*Long DOAN SY, Chisato KOJIMA, Manabu KAWASHIMA, Hiroshi NODA

Author information

Keywords: LES, Kolmogorov energy spectrum, grid spacing

CONFERENCE PROCEEDINGS FREE ACCESS

Pages 13-17

Details

Abstract

Optimizing grid spacing is critical for accurately capturing turbulent flow dynamics in Large Eddy Simulations (LES). This study examines the relationship between grid spacing and integral length scale using the Kolmogorov energy spectrum in various range of turbulence Reynold number. A quick estimation graph for grid spacing in LES analysis at the laboratory scale is provided. Verification simulation using ANSYS is conducted to confirm the adequacy of grid spacing estimations in three cases, with resolved kinetic energy ratios of 80%, 90%, and 95%. The results demonstrate that grid spacing can be estimated from the integral length scale and the ratio of resolved kinetic energy. Furthermore, the study recommends that the resolved kinetic energy should exceed 80% to ensure accurate flow resolution.

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