scholarly journals Energy- and Flux-Budget Turbulence Closure Model for Stably Stratified Flows. Part II: The Role of Internal Gravity Waves

2009 ◽  
Vol 133 (2) ◽  
pp. 139-164 ◽  
Author(s):  
S. S. Zilitinkevich ◽  
T. Elperin ◽  
N. Kleeorin ◽  
V. L’vov ◽  
I. Rogachevskii
Keyword(s):  
Gravity Waves ◽  
Internal Gravity Waves ◽  
Stratified Flows ◽  
Turbulence Closure ◽  
Closure Model ◽  
Turbulence Closure Model ◽  
Stably Stratified Flows

scholarly journals Internal gravity waves in the energy and flux budget turbulence-closure theory for shear-free stably stratified flows

2019 ◽  
Vol 99 (6) ◽  
Author(s):  
N. Kleeorin ◽  
I. Rogachevskii ◽  
I. A. Soustova ◽  
Yu. I. Troitskaya ◽  
O. S. Ermakova ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Internal Gravity Waves ◽  
Stratified Flows ◽  
Turbulence Closure ◽  
Stably Stratified Flows ◽  
Closure Theory

Amplitude Bounds for Nonlinear Internal Waves

2003 ◽  
Author(s):  
Nikolai I. Makarenko ◽  
Janna L. Maltseva
Keyword(s):  
Internal Waves ◽  
Gravity Waves ◽  
Density Profile ◽  
Analytical Methods ◽  
Internal Gravity Waves ◽  
Stratified Flows ◽  
Fine Scale ◽  
Critical Amplitude ◽  
The Mean

Amplitude bounds imposed by the conservation of mass, momentum and energy for internal gravity waves are considered. We discuss the theoretical schemes intended for a description of permanent waves just up to the broadening limit. Analytical methods which allow to determine the critical amplitude values for the current with a given density profile are considered. Attention is focused on the continuously stratified flows having multiple broadening limits. The role of the mean density profile and the influence of fine-scale stratification are analysed.

Comparison of a Nonlinear k-ε Turbulence Closure Model With Stress Transport Models

1993 ◽  
Author(s):  
Muhammad A. R. Sharif ◽  
Yat-Kit E. Wong
Keyword(s):  
Pipe Flow ◽  
Flow Problem ◽  
Swirling Flow ◽  
Transport Model ◽  
Turbulent Pipe Flow ◽  
Turbulence Closure ◽  
Closure Model ◽  
Transport Models ◽  
Mean Velocity ◽  
Turbulence Closure Model

Abstract The performance of a nonlinear k-ϵ turbulence closure model (NKEM), in the prediction of isothermal incompressible turbulent flows, is compared with that of the stress transport models such as the differential Reynolds stress transport model (RSTM) and the algebraic stress transport model (ASTM). Fully developed turbulent pipe flow and confined turbulent swirling flow with a central non-swirling jet are numerically predicted using the Marker and Cell (MAC) finite difference method. Comparison of the prediction with the experiment show that all three models perform reasonably well for the pipe flow problem. For the swirling flow problem, the RSTM and ASTM is superior than the NKEM. RSTM and ASTM provide good agreement with measured mean velocity profiles. However, the turbulent stresses are over- or under-predicted. NKEM performs badly in prediction of mean velocity as well as the turbulent stresses.

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