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Large Eddy Simulation of Turbulent Channel Flow Using Inhomogeneous Filter

비균질 필터를 사용한 난류 채널 유동의 Large Eddy Simulation

  • 이상환 (한양대학교 대학원 기계공학과) ;
  • 김광진 (한양대학교 기계공학부)
  • Published : 2004.09.01

Abstract

The commutation errors by the filtering process in the large eddy simulation are considered. It is compared the conventional filter with the inhomogeneous filter that is devised to reduce the commutation errors. The weighting factor of the inhomogeneous filter suggested by Vasilyev is adopted. Also, using the optimizing function that estimates test filter width to eliminate the dissipations in the region excluding the vicinity of the wall, the flow patterns are analyzed. It is evaluated in simulations of the turbulent channel flow at Reynolds number of 1020, based on friction velocity and channel half height. Results show that the commutation errors can be significantly reduced by using the inhomogeneous filter and the optimized test filter width.

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