Employment of second-moment closure for calculation of turbulent recirculating flows in complex geometries with collocated variable arrangement

1993 ◽  
Vol 16 (6) ◽  
pp. 525-544 ◽  
Author(s):  
Bijan Farhanieh ◽  
Lars Davidson ◽  
Bengt Sundén
Keyword(s):  
Moment Closure ◽  
Complex Geometries ◽  
Second Moment ◽  
Recirculating Flows ◽  
Second Moment Closure

Modeling the Rapid Part of the Pressure-Diffusion Process in the Reynolds Stress Transport Equation

2004 ◽  
Vol 126 (4) ◽  
pp. 634-641 ◽  
Author(s):  
Kazuhiko Suga
Keyword(s):  
Diffusion Process ◽  
Reynolds Stress ◽  
Moment Closure ◽  
Turbulence Energy ◽  
Second Moment ◽  
Recirculating Flow ◽  
Pressure Diffusion ◽  
Two Component ◽  
Recirculating Flows ◽  
Second Moment Closure

Modeling the pressure-diffusion process is discussed to improve the prediction of turbulent recirculating flows by a second moment closure. Since the recent DNS research of a turbulent recirculating flow by Yao et al. [Theore. Comput. Fluid Dynamics 14 (2001) 337–358] suggested that the pressure-diffusion process of the turbulence energy was significant in the recirculating region, the present study focuses on the rapid part of the process consisting of the mean shear. This rapid pressure-diffusion model is developed for the Reynolds stress equation using the two-component-limit turbulence condition and added to a low Reynolds number two-component-limit full second moment closure for evaluation. Its effects are discussed through applications of turbulent recirculating flows such as a trailing-edge and a back-step flows. Encouraging results are obtained though some margins to be improved still remain.

Nonlinear second moment closure consistent with shear and strain flows

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 825-831
Author(s):  
Dirk G. Pfuderer ◽  
Claus Eifert ◽  
Johannes Janicka
Keyword(s):  
Moment Closure ◽  
Second Moment ◽  
Second Moment Closure

Computation of Discrete-Hole Film Cooling by a Near-Wall Second-Moment Turbulence Closure

1999 ◽  
Author(s):  
Hamn-Ching Chen ◽  
Gengsheng Wei ◽  
Je-Chin Han
Keyword(s):  
Film Cooling ◽  
Moment Closure ◽  
Navier Stokes ◽  
Closure Model ◽  
Complex Flow ◽  
Second Moment ◽  
Finite Analytic Method ◽  
Second Moment Closure ◽  
Effectiveness Prediction ◽  
Near Wall

Abstract A multiblock Favre-Averaged Navier-Stokes (FANS) method has been developed in conjunction with a chimera domain decomposition technique for investigation of flat surface, discrete-hole film cooling performance. The finite-analytic method solves the FANS equations in conjunction with a near-wall second-order Reynolds stress (second-moment) closure model and a two-layer k-ε model. Comparisons of flow fields and turbulence quantities with experimental data clearly demonstrate the capability of the near-wall second-moment closure model for accurate resolution of the complex flow interaction bewteen the coolant jet and the mainstream. The near-wall second-moment anisotropic model provides better agreement in adiabatic film effectiveness prediction than the two-layer k-ε model.

A Comparison of Algebraic and Differential Second-Moment Closures for Axisymmetric Turbulent Shear Flows With and Without Swirl

1988 ◽  
Vol 110 (2) ◽  
pp. 216-221 ◽  
Author(s):  
S. Fu ◽  
P. G. Huang ◽  
B. E. Launder ◽  
M. A. Leschziner
Keyword(s):  
Shear Flows ◽  
Turbulent Jets ◽  
Moment Closure ◽  
Turbulent Shear ◽  
Turbulence Energy ◽  
Second Moment ◽  
Second Moment Closure ◽  
Transport Effects ◽  
Related Stress ◽  
Comparison Of The Results

Computations are reported for three axisymmetric turbulent jets, two of which are swirling and one containing swirl-induced recirculation, obtained with two models of turbulence: a differential second-moment (DSM) closure and an algebraic derivative thereof (ASM). The models are identical in respect of all turbulent processes except that, in the ASM scheme, stress transport is represented algebraically in terms of the transport of turbulence energy. The comparison of the results thus provides a direct test of how well the model of stress transport adopted in ASM schemes simulates that of the full second-moment closure. The comparison indicates that the ASM hypothesis seriously misrepresents the diffusive transport of the shear stress in nonswirling axisymmetric flows, while in the presence of swirl the defects extend to all stress components and are aggravated by a failure to account for influential (additive) swirl-related stress-transport terms in the algebraic modelling process. The principal conclusion thus drawn is that in free shear flows where transport effects are significant, it is advisable to adopt a full second-moment closure if turbulence modelling needs to proceed beyond the eddy-viscosity level.

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