High Resolution Three-Dimensional (2563) Spatio-Temporal Measurements of the Conserved Scalar Field in Turbulent Shear Flows

1991 ◽  
pp. 17-26 ◽  
Author(s):  
Werner J. A. Dahm ◽  
Kenneth A. Buch
Keyword(s):  
Scalar Field ◽  
High Resolution ◽  
Shear Flows ◽  
Three Dimensional ◽  
Turbulent Shear ◽  
Turbulent Shear Flows ◽  
Spatio Temporal

Computation of three-dimensional turbulent shear flows in corners

1983 ◽  
Author(s):  
J. GORSKI ◽  
T. GOVINDAN ◽  
B. LAKSHMINARAYANA
Keyword(s):  
Shear Flows ◽  
Three Dimensional ◽  
Turbulent Shear ◽  
Turbulent Shear Flows

Computation of three-dimensional turbulent shear flows in corners

AIAA Journal ◽  
1985 ◽  
Vol 23 (5) ◽  
pp. 685-692 ◽  
Author(s):  
J. J. Gorski ◽  
T. R. Govindan ◽  
B. Lakshminarayana
Keyword(s):  
Shear Flows ◽  
Three Dimensional ◽  
Turbulent Shear ◽  
Turbulent Shear Flows

STREAMWISE VORTICES AND REYNOLDS STRESSES OF WALL-BOUNDED TURBULENT SHEAR FLOWS

2010 ◽  
Vol 24 (13) ◽  
pp. 1425-1428
Author(s):  
MING-DE ZHOU ◽  
HONG-YU ZHU ◽  
KAI CHEN ◽  
ZHEN-SU SHE
Keyword(s):  
Shear Flows ◽  
Mean Field ◽  
Three Dimensional ◽  
Turbulent Shear ◽  
Wall Region ◽  
Streamwise Vortices ◽  
Reynolds Stresses ◽  
Ensemble Averaging ◽  
Velocity Fluctuations ◽  
Turbulent Shear Flows

Reynolds Equation is the most commonly used governing equation in turbulence. However, its application in wall-bounded turbulent shear flows may involve a defect. In general, Reynolds averaging should be ensemble averaging and Reynolds stresses are supposed to express all the actions of turbulence on the mean field. In statistically steady three-dimensional flows, Reynolds stresses are usually defined as correlations of temporal velocity fluctuations so that they cannot contain the influences of steady components of streamwise vortices. This is believed to be one of the reasons why many closure models in RANS meet problems in flows where streamwise vortices play significant roles. In this paper, Spatial-Temporal (S-T) averaged Reynolds stresses were defined, which separates the turbulence actions caused by temporal or spatial velocity fluctuations. DNS data for a fully developed channel flow were then used to check balancing of equations. Comparison showed that the balancing errors in the S-T averaged Reynolds equations were obviously smaller than those in the temporal averaged one, in particular, in the near wall region where the streamwise vortices located. Thus, a combination of traditional model with a supplemental model expressing influences of streamwise vortices might be a way out to improve the turbulence modeling.

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