Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)
- Volume 21 Issue 6
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- Pages.779-792
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- 1997
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
DOI QR Code
A study on the early stage of a transitional boundary layer and far field noise using a large eddy simulation technique
큰 에디 모사 기법을 이용한 초기 천이 경계층 유동 및 방사 소음 해석
- Choe, Myeong-Ryeol (Dept.of Mechanical Engineering, Graduate School of Seoul National University) ;
- Choe, Hae-Cheon ;
- Gang, Sin-Hyeong
- Published : 1997.06.01
Abstract
Flow characteristics are numerically investigated when a packet of waves consisting of a Tollmien-Schlichting wave and a pair of Squire waves evolves in a flat-plate laminar boundary layer using a large eddy simulation with a dynamic subgrid-scale model. Characteristics of early stage transitional boundary layer flow such as the .LAMBDA. vortex, variation of the skin friction and backscatter are predicted. Smagorinsky constants and the eddy viscosity obtained from the dynamic subgrid-scale model significantly change as the flow evolves. Far Field noise radiated from the transitional boundary layer shows the dipole and quadrupole characteristics owing to the wall shear stress and the Reynolds stresses, respectively.