Behaviour analysis of numerical solutions and simulation of coherent structures in compressible mixing layers

Sadhana ◽  
1998 ◽  
Vol 23 (5-6) ◽  
pp. 459-480
Author(s):  
Fu Dexun ◽  
Ma Yanwen
Keyword(s):  
Coherent Structures ◽  
Numerical Solutions ◽  
Mixing Layers ◽  
Behaviour Analysis

A linear approach for the evolution of coherent structures in shallow mixing layers

2002 ◽  
Vol 14 (12) ◽  
pp. 4105-4114 ◽  
Author(s):  
Bram C. van Prooijen ◽  
Wim S. J. Uijttewaal
Keyword(s):  
Coherent Structures ◽  
Mixing Layers ◽  
Linear Approach

Streamwise vortices in shear flows: harbingers of transition and the skeleton of coherent structures

2010 ◽  
Vol 661 ◽  
pp. 178-205 ◽  
Author(s):  
PHILIP HALL ◽  
SPENCER SHERWIN
Keyword(s):  
Coherent Structures ◽  
Shear Flows ◽  
Numerical Solutions ◽  
Stokes Equations ◽  
Wave Interaction ◽  
Streamwise Vortex ◽  
Navier Stokes ◽  
Turbulent Shear ◽  
Turbulent Shear Flows ◽  
External Flows

The relationship between asymptotic descriptions of vortex–wave interactions and more recent work on ‘exact coherent structures’ is investigated. In recent years immense interest has been focused on so-called self-sustained processes in turbulent shear flows where the importance of waves interacting with streamwise vortex flows has been elucidated in a number of papers. In this paper, it is shown that the so-called ‘lower branch’ state which has been shown to play a crucial role in these self-sustained processes is a finite Reynolds number analogue of a Rayleigh vortex–wave interaction with scales appropriately modified from those for external flows to Couette flow, the flow of interest here. Remarkable agreement between the asymptotic theory and numerical solutions of the Navier–Stokes equations is found even down to relatively small Reynolds numbers, thereby suggesting the possible importance of vortex–wave interaction theory in turbulent shear flows. The relevance of the work to more general shear flows is also discussed.

Coherent structures in the mixing layers of a non-Newtonian fluid

2004 ◽  
Vol 5 ◽  
Author(s):  
Jianzhong Lin ◽  
Zhaosheng Yu ◽  
Xueming Shao
Keyword(s):  
Newtonian Fluid ◽  
Coherent Structures ◽  
Mixing Layers

The roll-up and merging of coherent structures in shallow mixing layers

2016 ◽  
Vol 28 (9) ◽  
pp. 094103 ◽  
Author(s):  
M. Y. Lam ◽  
M. S. Ghidaoui ◽  
A. A. Kolyshkin
Keyword(s):  
Coherent Structures ◽  
Mixing Layers

scholarly journals Verification and Validation of URANS Simulations of the Round Buoyant Jet in Counterflow

Water ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1509 ◽  
Author(s):  
Yizhou Xiao ◽  
Wenxin Huai ◽  
Bin Ji ◽  
Zhonghua Yang
Keyword(s):  
Coherent Structures ◽  
Numerical Solutions ◽  
Uncertainty Estimation ◽  
Verification And Validation ◽  
Navier Stokes ◽  
Ambient Fluid ◽  
Buoyant Jet ◽  
Two Phase ◽  
Buoyant Jets ◽  
Phase Mixture

This paper presents a study on the verification and validation (V&V) of numerical solutions for round buoyant jets in counterflow. The unsteady flow was simulated using an unsteady Reynolds-averaged Navier–Stokes (URANS) solver with a two-phase mixture model. This work aimed to quantitatively investigate the reliability and applicability of various uncertainty estimators in the simulation of a buoyant jet in counterflow. Analysis of the discretization uncertainty estimation results revealed that the factor of safety (FS) and the modified FS (FS1) methods were the appropriate evaluation estimators in the simulation of a buoyant jet in counterflow. Validation by comparison with the experimental data indicated that the area without achieving the validation at the validation level was strongly related to the shear layer between the jet flow and the ambient fluid. Moreover, the predicted concentration contours, coherent structures, and centerline concentration were strongly affected by the grid resolution.

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