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| Influence of different turbulence models on simulation of internal flow field of jet pump |
| YANG Xue-Long, LONG Xin-Ping, XIAO Long-Zhou, Lv Qiao |
| (1.School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China; 2.Key Laboratory of Hubei Province for Waterjet Theory ＆ New Technology, Wuhan, Hubei 430072, China) |
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Abstract To study the effect of different turbulence models and related wall boundary treatment methods on the simulation of the performance and internal flow field of a jet pump, and to find their good combination, six turbulence models (namely, three k-ε models, standard and SST k-ω models and Reynolds stress models) and two wall treatment methods (standard wall functions and enhanced wall treatment) were combined in different ways. Standard wall functions and enhanced wall treatment were respectively applied to three k-ε models and RSM model. Both k-ω models were used as lowReynoldsnumber models without applying any wall treatment methods. Ten combinations were thus obtained. The data of the performance and the static wall pressure distribution of a jet pump were employed as the criteria to validate the simulation results. The results show that all the ten combinations agree well with the experiment data when the volumetric flow ratio is relatively low, and all simulation errors of the ten combinations are greater than 10% when working at relatively high flow ratio. After adjusting constants of the turbulent model, for some combinations, the difference between the errors of the predicted results and the experiment data were lowered to be less than 5%. The model constant C2ε has a greater influence than σε on the calculation; and the maximum turbulence energy decreases as C2ε or σε decreases, but the distribution region of turbulence energy expands correspondingly.
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Received: 22 October 2012
Published: 28 February 2013
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