Intermittency modeling for computation of turbulent free shear flows난류 자유전단류의 계산을 위한 간헐도 모델의 개발

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By considering the entrainment effect on the intermittency in free boundary shear layers, a set of computational turbulence model equations for the turbulent kinetic energy $\kappa$, the dissipation rate e, and the intermittency factor $\gamma$ is brought forward. The proposed model enables us to explicitly incorporate the inetrmittency effects in the conventional $\kappa-\varepsilon$ turbulence model equations. In this case, the eddy viscosity $\nu_t$ is estimated by a function of $\kappa$, $\varepsilon$ and $\gamma$. COntrary to the closure shcemes of previous intermittency modelling which employ conditional zone averaged moments, the present model equations are based on the conventional Reynolds averaged moments. The proposed $\kappa-\varepsilon-\gamma$ model has been applied to compute a plane jet, a round jet, a plane far wake and a plane mixing layer, of which predictions by any current closure scheme poses anomaly problems. The computational results of the present model shows considerable improvment over the previous models for all these shear flows. Especially, the signkficantly improved accuraty. Consequently, the spreading rates and the centerline mean velocity decays are all correctly estimated in comparison with available data sources.
Advisors
Chung, Myung-Kyoonresearcher정명균researcher
Description
한국과학기술원 : 기계공학과,
Publisher
한국과학기술원
Issue Date
1991
Identifier
61775/325007 / 000845323
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 기계공학과, 1991.8, [ xiv, 137, [viii] p. ]

URI
http://hdl.handle.net/10203/42711
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=61775&flag=dissertation
Appears in Collection
ME-Theses_Ph.D.(박사논문)
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