Turbulent transport in wall‐bounded flows. Evaluation of model coefficients using direct numerical simulation

1993 ◽  
Vol 5 (12) ◽  
pp. 3233-3239 ◽  
Author(s):  
J. B. Cazalbou ◽  
P. Bradshaw
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Turbulent Transport ◽  
Wall Bounded Flows

Numerical Simulation of Turbulent Transport and Structures in Temporally Developing Plane Mixing Layers

2013 ◽  
Vol 367 ◽  
pp. 57-62
Author(s):  
Thangam Natarajan
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Computational Model ◽  
Simulation Study ◽  
Initial Conditions ◽  
Turbulent Transport ◽  
Turbulence Models ◽  
Mixing Layers ◽  
Turbulent Structures

The investigation on the sensitivity of the flows to the initial conditions was carried with varying grid resolutions, turbulence models and perturbations. The Direct Numerical Simulation study of Pantano and Sarkar [1] was taken as the reference study and the computational model used in this study was built with a similar configuration of theirs except for the perturbations used. Important results were arrived pertaining to the effect of initial conditions on the turbulent properties and the turbulent structures of the flow.

Contribution of direct numerical simulation to understanding and modelling turbulent transport

1995 ◽  
Vol 451 (1941) ◽  
pp. 257-292 ◽  
Keyword(s):  
Numerical Simulation ◽  
Numerical Methods ◽  
Direct Numerical Simulation ◽  
Large Scale ◽  
Turbulent Transport ◽  
Scalar Flux ◽  
Remarkable Change ◽  
New Findings ◽  
Eddy Structures ◽  
Prandtl Numbers

With the advances in large scale computers, reliable numerical methods and efficient post-processing environment, direct numerical simulation (DNS) has become a valuable and indispensable resource for fundamental turbulence research, although DNS is possible only when the turbulent Reynolds (or Peclet) number remains small to moderate. This paper reviews the contribution that various DNSS have made to understanding and modelling turbulent transport phenomena. After general remarks are made on the grid requirements and numerical methods of DNS, its novelties as a numerical experiment are summarized and some of them are demonstrated by introducing typical DNS results at the University of Tokyo. Emphasis is laid upon new findings on the turbulence statistics, their budgets and quasi-coherent eddy structures revealed by the simulations of the fully developed channel flow with heat transport at different Prandtl numbers, and also a recent modelling attempt to take into account the new knowledge extracted from these DNSS, i. e. a remarkable change of the destruction mechanism of turbulent scalar flux with the Prandtl number and a low Reynolds number effect on the redistribution process of the Reynolds stress.

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