A simplified one-equation elliptic-relaxation model

2019 ◽  
Author(s):  
Xiaoqing Tian ◽  
M. M. Rahman ◽  
Huachen Pan ◽  
A. K. M. Sadrul Islam
Keyword(s):  
Relaxation Model ◽  
Elliptic Relaxation

Evaluation of Turbulence Models for Thermal Striping in a Triple-Jet

2005 ◽  
Author(s):  
Seok-Ki Choi ◽  
Ho-Yun Nam ◽  
Myung-Hwan Wi ◽  
Seong-O Kim ◽  
Jong-Chull Jo ◽  
...  
Keyword(s):  
Experimental Data ◽  
Root Mean Square ◽  
Transport Model ◽  
Computational Study ◽  
Turbulence Models ◽  
Oscillatory Behavior ◽  
Mean Square ◽  
Relaxation Model ◽  
Elliptic Relaxation ◽  
Thermal Striping

A computational study for the evaluation of the current turbulence models for the prediction of a thermal striping in a triple-jet is performed. The tested turbulence models are the two-layer model, the shear stress transport model and the elliptic relaxation model. These three turbulence models are applied to the prediction of the thermal striping in a triple-jet in which detailed experimental data are available. The performances of the tested turbulence models are evaluated through comparisons with the experimental data. The predicted mean and root-mean-square values of the temperature are compared with the experimental data, and the capability of predicting the oscillatory behavior of the ensemble-averaged temperature is investigated. From these works it is shown that only the elliptic relaxation model is capable of predicting the oscillatory behavior of the ensemble-averaged temperature. It is also shown that the elliptic relaxation model predicts best the time-averaged and root-mean-square of the temperature fluctuation. However, this model predicts a slower mixing at the far downstream of the jet.

Evaluation of Turbulence Models for Thermal Striping in a Triple Jet

2006 ◽  
Vol 129 (4) ◽  
pp. 583-592 ◽  
Author(s):  
Seok-Ki Choi ◽  
Seong-O Kim
Keyword(s):  
Experimental Data ◽  
Root Mean Square ◽  
Transport Model ◽  
Computational Study ◽  
Turbulence Models ◽  
Oscillatory Behavior ◽  
Mean Square ◽  
Relaxation Model ◽  
Elliptic Relaxation ◽  
Thermal Striping

A computational study for an evaluation of the current turbulence models for the prediction of a thermal striping in a triple jet is performed. The tested turbulence models are the two-layer model, the shear stress transport model, and the elliptic relaxation model. These three turbulence models are applied to the prediction of a thermal striping in a triple jet in which detailed experimental data are available. The predicted time-averaged and root-mean-square values of the temperature are compared with the experimental data, and the capability of predicting the oscillatory behavior of the ensemble-averaged temperature is investigated. From these works, it is shown that only the elliptic relaxation model is capable of predicting the oscillatory behavior of the ensemble-averaged temperature. It is also shown that the elliptic relaxation model predicts best the time-averaged temperature and the root mean square of the temperature fluctuation. However, this model predicts a slower mixing at the far downstream of the jet.

Modeling near-wall effects in axially rotating pipe flow by elliptic relaxation

AIAA Journal ◽  
1998 ◽  
Vol 36 ◽  
pp. 1164-1170
Author(s):  
B. A. Pettersson ◽  
H. I. Andersson ◽  
A. S. Brunvoll
Keyword(s):  
Pipe Flow ◽  
Wall Effects ◽  
Elliptic Relaxation ◽  
Rotating Pipe Flow ◽  
Near Wall
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