LARGE EDDY SIMULATION OF THERMAL JETS IN CROSS FLOW

被引:6
作者
Ma, F. [1 ]
Satish, M. [1 ]
Islam, M. R. [1 ]
机构
[1] Dalhousie Univ, Civil & Resource Engn Dept, Halifax, NS B3H 4R2, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1080/19942060.2007.11015179
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study is related to the numerical simulations of a bent-over thermal jet. The governing equations of the fluid are solved with the help of a three-dimensional buoyancy-extended large eddy simulation (LES) numerical model. In addition, the dynamic procedure is used to evaluate the Smagorinsky model coefficient. The finite difference formulations of the governing equations are split into three parts related to advection, dispersion and propagation. The advection part is solved by the QUICKEST scheme. The dispersion part is solved by the central difference method and the propagation part is solved implicitly by using the Gauss-Seidel iteration method. The initial turbulence of the thermal jet from the orifice is accounted for by introducing random disturbances to the flowing parameters. Ensemble averaged determinant relationships for the bent-over jet trajectory, jet sizes and concentration dilution are presented. The salient characteristics of the bent-over thermal jet are captured, including variability among different realizations of the thermal jet, the development of protuberances, the horseshoe cross sectional shape and the hollow trough along the bent-over concave side of the jet. The protuberance characteristic and the asymmetric shape of the jet from the present study are compared with the results from the conventional k-epsilon model. The horseshoe cross sectional shape and the trough or bifurcation characteristics are investigated by studying the inner structures of the flow field. These quantitative relationships and qualitative observations are found to be in good agreement with experimental results from an earlier investigation.
引用
收藏
页码:25 / 35
页数:11
相关论文
共 22 条
[1]   A NUMERICAL STUDY OF 3 DIMENSIONAL TURBULENT CHANNEL FLOW AT LARGE REYNOLDS NUMBERS [J].
DEARDORFF, JW .
JOURNAL OF FLUID MECHANICS, 1970, 41 :453-+
[2]   A DYNAMIC SUBGRID-SCALE EDDY VISCOSITY MODEL [J].
GERMANO, M ;
PIOMELLI, U ;
MOIN, P ;
CABOT, WH .
PHYSICS OF FLUIDS A-FLUID DYNAMICS, 1991, 3 (07) :1760-1765
[3]  
Koh RCY, 1973, MATH MODEL BARGED OC
[4]  
LAUNDER BE, 1974, COMPUT METHODS APPL, V3, P289
[5]   STABLE AND ACCURATE CONVECTIVE MODELING PROCEDURE BASED ON QUADRATIC UPSTREAM INTERPOLATION [J].
LEONARD, BP .
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING, 1979, 19 (01) :59-98
[6]  
Lesieur M, 1996, ANNU REV FLUID MECH, V28, P45
[7]  
Li CW, 2000, INT J NUMER METH FL, V34, P31, DOI 10.1002/1097-0363(20000915)34:1<31::AID-FLD47>3.0.CO
[8]  
2-U
[9]   Large eddy simulation of diffusion of a buoyancy source in ambient water [J].
Li, CW ;
Ma, FX .
APPLIED MATHEMATICAL MODELLING, 2003, 27 (08) :649-663
[10]   A PROPOSED MODIFICATION OF THE GERMANO-SUBGRID-SCALE CLOSURE METHOD [J].
LILLY, DK .
PHYSICS OF FLUIDS A-FLUID DYNAMICS, 1992, 4 (03) :633-635