Numerical Prediction of Turbulent Flow past a 2D Surface-mounted Rib
Author(s): LIU Baicang, MA Jun, HUANG Shehua, QIAN Zhongdong, CHEN Wenxue
Pages: 879-890
Year: 2008 Issue: 6
Journal: Journal of Basic Science and Engineering
Keyword: hybrid finite analytic method; two-layer model; turbulent flow; wall function method; surface-mounted ribManuscript received 2007 -03 -28; Revised 2008 -03 -26Foundation itemThis work is partially supported by Natural Science Foundation of China( No;
Abstract: A numerical study was performed for investigating the turbulent flow over a surface-mounted two-dimensional rib using Hybrid Finite Analytic Method (HFAM).The Boussinesq approximation had been used for modeling of the Reynolds stress. A two-equation k-ε model with two-layer model was employed. The validity of the numerical method was tested by comparison the numerical predictions with experimental results and numerical simulation results available in literatures, and a good agreement was obtained. The simulation results showed that the two-layer model was suit for modeling the turbulent flow over a square rib and was more accurate than wall function method. Numerical simulation results indicated that upstream of the rib, the length of vortex Ⅰ almost had no change with varying rib lengths under the same rib height and flow conditions ( Re = 1.4 × 104, H = 1.0), downstream of the rib, if L/H ≥ 4 the length of vortex Ⅱ keeps almost unchanged for the varying lengths.
Pages: 879-890
Year: 2008 Issue: 6
Journal: Journal of Basic Science and Engineering
Keyword: hybrid finite analytic method; two-layer model; turbulent flow; wall function method; surface-mounted ribManuscript received 2007 -03 -28; Revised 2008 -03 -26Foundation itemThis work is partially supported by Natural Science Foundation of China( No;
Abstract: A numerical study was performed for investigating the turbulent flow over a surface-mounted two-dimensional rib using Hybrid Finite Analytic Method (HFAM).The Boussinesq approximation had been used for modeling of the Reynolds stress. A two-equation k-ε model with two-layer model was employed. The validity of the numerical method was tested by comparison the numerical predictions with experimental results and numerical simulation results available in literatures, and a good agreement was obtained. The simulation results showed that the two-layer model was suit for modeling the turbulent flow over a square rib and was more accurate than wall function method. Numerical simulation results indicated that upstream of the rib, the length of vortex Ⅰ almost had no change with varying rib lengths under the same rib height and flow conditions ( Re = 1.4 × 104, H = 1.0), downstream of the rib, if L/H ≥ 4 the length of vortex Ⅱ keeps almost unchanged for the varying lengths.
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