Eddy viscosity modeling around curved boundaries through bifurcation approach and theory of rotating turbulence

2021 ◽  
Vol 33 (7) ◽  
pp. 075118
Author(s):  
Yi Han Toh ◽  
Bing Feng Ng
Keyword(s):  
Eddy Viscosity ◽  
Curved Boundaries ◽  
Rotating Turbulence ◽  
Viscosity Modeling

Turbulence Modeling for the Axially Rotating Pipe From the Viewpoint of Analytical Closures

2003 ◽  
Author(s):  
Robert Rubinstein ◽  
Ye Zhou
Keyword(s):  
Eddy Viscosity ◽  
Present Model ◽  
Turbulence Modeling ◽  
Single Point ◽  
Mean Velocity ◽  
Eddy Viscosity Model ◽  
Rotating Turbulence ◽  
The Mean ◽  
Production Mechanisms ◽  
Rapid Pressure

A single-point model eddy viscosity model of rotation effects on the turbulent flow in an axially rotating pipe is developed based on two-point closure theories. Rotation is known to impede energy transfer in turbulence; this fact is reflected in the present model through a reduced eddy viscosity, leading to laminarization of the mean velocity profile and return to a laminar friction law in the rapid rotation limit. This model is compared with other proposals including linear redistribution effects through the rapid pressure-strain correlation, Richardson number modification of the eddy viscosity in a model of non-rotating turbulence, and the reduction of turbulence through the suppression of near-wall production mechanisms.

scholarly journals Eddy viscosity modeling in the prediction of turbulent, backmixed combustion performance

1977 ◽  
Vol 16 (1) ◽  
pp. 1675-1687 ◽  
Author(s):  
R.E. Peck ◽  
G.S. Samuelsen
Keyword(s):  
Eddy Viscosity ◽  
Combustion Performance ◽  
Viscosity Modeling

Nonlinear eddy viscosity modeling and experimental study of jet spreading rates

Indoor Air ◽  
2013 ◽  
Vol 24 (1) ◽  
pp. 93-102 ◽  
Author(s):  
C. Heschl ◽  
K. Inthavong ◽  
W. Sanz ◽  
J. Tu
Keyword(s):  
Experimental Study ◽  
Eddy Viscosity ◽  
Viscosity Modeling ◽  
Spreading Rates

Eddy viscosity modeling and turbulence theory

2017 ◽  
Vol 172 (9-10) ◽  
pp. 718-722
Author(s):  
Robert Rubinstein
Keyword(s):  
Eddy Viscosity ◽  
Turbulence Theory ◽  
Viscosity Modeling

Analysis of Model Variance for Ensemble Based Turbulence Modeling

2015 ◽  
Vol 15 (2) ◽  
pp. 173-188 ◽  
Author(s):  
Nan Jiang ◽  
Songul Kaya ◽  
William Layton
Keyword(s):  
Eddy Viscosity ◽  
Turbulence Modeling ◽  
Turbulent Viscosity ◽  
Viscosity Coefficient ◽  
Unconditional Stability ◽  
Combined Approach ◽  
Time Stepping ◽  
Eddy Viscosity Model ◽  
Viscosity Modeling ◽  
The Ensemble Method

AbstractThis report develops an ensemble or statistical eddy viscosity model. The model is parameterized by an ensemble of solutions of an ensemble-Leray regularization. The combined approach of ensemble time stepping and ensemble eddy viscosity modeling allows direct parametrization of the turbulent viscosity coefficient. We prove unconditional stability and that the model's solution approaches statistical equilibrium as t → ∞; the model's variance converges to zero as t → ∞. The ensemble method is used to interrogate a rotating flow, testing its predictability by computing effective averaged Lyapunov exponents.

INCREASE OF HEAT TRANSFER AND NEGATIVE EDDY VISCOSITY IN TURBULENT FLOWS INFLUENCED BY A MAGNETIC FIELD

1990 ◽  
Author(s):  
C. Henoch ◽  
Martin Hoffert ◽  
A. Baron ◽  
D. Klaiman ◽  
Semion Sukoriansky ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Turbulent Flows ◽  
Eddy Viscosity
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