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Part of the book series: Fluid Mechanics and Its Applications ((FMIA,volume 48))

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Abstract

The mean-velocity (U) equation (2.100) and the mean-scalar (Θ) equation (2.102) do not constitute closed systems of equations owing to the presence of the Reynolds stress R ij (= 〈u i u j 〉) and the turbulent scalar flux H θ (= 〈uθ′〉). In turbulence modeling, we relate these quantities to U and Θ explicitly or implicitly. Here we have two primary approaches. One is the algebraic modeling represented by the turbulent-viscosity approximation to R ij , and the other is the second-order modeling, in which the transport equations for R ij and H θ , (2.105) and (2.120), are treated directly. In the former, R ij and H θ are expressed in terms of U, Θ, and some one-point quantities characterizing turbulence, such as the turbulent energy K and its dissipation rate ε. In the latter, the third-order quantities such as the pressure-strain correlation function Π ij [Eq. (2.107)] need to be modeled.

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© 1998 Springer Science+Business Media Dordrecht

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Yoshizawa, A. (1998). Conventional Turbulence Modeling. In: Hydrodynamic and Magnetohydrodynamic Turbulent Flows. Fluid Mechanics and Its Applications, vol 48. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1810-3_4

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  • DOI: https://doi.org/10.1007/978-94-017-1810-3_4

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-90-481-5090-8

  • Online ISBN: 978-94-017-1810-3

  • eBook Packages: Springer Book Archive

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