TURBULENT FLOW CHARACTERISTICS OF CHANNEL FLOW USING LARGE EDDY SIMULATION WITH WALL-FUNCTION(FDS CODE)

- Journal title : Journal of computational fluids engineering
- Volume 20, Issue 3, 2015, pp.94-103
- Publisher : Korea Society of Computational Fluids Engineering
- DOI : 10.6112/kscfe.2015.20.3.94

Title & Authors

TURBULENT FLOW CHARACTERISTICS OF CHANNEL FLOW USING LARGE EDDY SIMULATION WITH WALL-FUNCTION(FDS CODE)

Jang, Yong-Jun; Ryu, Ji-Min; Ko, Han Seo; Park, Sung-Huk; Koo, Dong-Hoe;

Jang, Yong-Jun; Ryu, Ji-Min; Ko, Han Seo; Park, Sung-Huk; Koo, Dong-Hoe;

Abstract

The turbulent flow characteristics in the channel flow are investigated using large eddy simulation(LES) of FDS code, built in NIST(USA), in which the near-wall flow is solved by Werner-Wengle wall function. The periodic flow condition is applied in streamwise direction to get the fully developed turbulent flow and symmetric condition is applied in lateral direction. The height of the channel is H=1m, and the length of the channel is 6H, and the lateral length is H. The total grid is and is kept above 11 to fulfill the near-wall flow requirement. The Smagorinsky model is used to solve the sub-grid scale stress. Smagorinsky constant is 0.2(default in FDS). Three cases of Reynolds number(10,700, 26,000, 49,000.), based on the channel height, are analyzed. The simulated results are compared with direct numerical simulation(DNS) and particle image velocimetry(PIV) experimental data. The linear low-Re eddy viscosity model of Launder & Sharma and non-linear low-Re eddy viscosity model of Abe-Jang-Leschziner are utilized to compare the results with LES of FDS. Reynolds normal stresses, Reynolds shear stresses, turbulent kinetic energys and mean velocity flows are well compared with DNS and PIV data.

Keywords

Large Eddy Simulation;FDS(Fire Dynamics Simulator);Wall Function;Turbulent Flow;Eddy Viscosity;

Language

Korean

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