TY - JOUR

T1 - Development of a gradient diffusion type of Heat-Flux model with an introduction of a quadratic reynolds stress tensor

AU - Suga, Kazuhiko

AU - Abe, Ken Ichi

PY - 1998

Y1 - 1998

N2 - A new explicit algebraic gradient diffusion model for turbulent scalar (heat) flux in forced convection regimes is proposed. This model complies with the linearity and independence principles for passive scalar. For satisfying these, the model coefficients/functions do not include any turbulent scalar variable such as the temperature variance. The model thus does not require solving transport equations for turbulent quantities of the scalar field. The basic role of each model coefficient has been optimized by referring to the discussion with the LES data reported by the authors. The proposed model is applicable to a wide range of passive scalar fields by being coupled wh a nonlinear k-E- A three equation turbulence model for dynamic fields. It has been confirmed that the model is able to capture the components of turbulent heat flux vectors in wall shear flows at least in the range of 0.025 &lE Pr &lE 95. Moreover, it has successfully distinguished the heat flux characteristics near shear- free boundaries.

AB - A new explicit algebraic gradient diffusion model for turbulent scalar (heat) flux in forced convection regimes is proposed. This model complies with the linearity and independence principles for passive scalar. For satisfying these, the model coefficients/functions do not include any turbulent scalar variable such as the temperature variance. The model thus does not require solving transport equations for turbulent quantities of the scalar field. The basic role of each model coefficient has been optimized by referring to the discussion with the LES data reported by the authors. The proposed model is applicable to a wide range of passive scalar fields by being coupled wh a nonlinear k-E- A three equation turbulence model for dynamic fields. It has been confirmed that the model is able to capture the components of turbulent heat flux vectors in wall shear flows at least in the range of 0.025 &lE Pr &lE 95. Moreover, it has successfully distinguished the heat flux characteristics near shear- free boundaries.

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U2 - 10.1299/kikaib.64.2570

DO - 10.1299/kikaib.64.2570

M3 - Article

AN - SCOPUS:77950040970

VL - 64

SP - 2570

EP - 2577

JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

SN - 0387-5016

IS - 624

ER -