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| Numerical study on dynamic characteristics of flow around a vanes in the channel based on overset meshes |
| HUANG Jianfeng1*,YANG Song1,LONG Liyan1,ZHANG Lixiang2 |
| 1. Faculty of Water Conservation, Yunnan Agricultural University, Kunming, Yunnan 650201, China; 2. Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650500, China |
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Abstract Numerical simulation of turbulent flow around a vane in the channel with guide vane closure based on the two-dimensional transient N-S equation was conducted with the standard k-ε turbulence model. In order to study the dynamic effect of the cascade flow field on the fluid-structure interaction occurring between the flow and guide vanes in the transient process of hydro-turbine, the overset meshes and dynamic mesh technology were used in such an unsteady flow problem. The dynamic characteristics of non-uniform flow field show strong nonlinearity under the two methods. The lift and drag coefficients of a guide vane are in good agreement with time. The pressure, vortex structure and turbulence intensity distribution in the channel at the typical time are basically the same. But the mesh number of the overset mesh is about 1/3 of the dynamic mesh, and the computation time is about 1/4 of the dynamic mesh. It is shown that the overset mesh method has better advantages than the dynamic mesh method in terms of computational efficiency. The results show that the two methods can well simulate the dynamic flow around a guide vane. But for some complicated nonlinear dynamic boundary fluid-structure interaction problems, the overset mesh method is preferred. The two methods are of higher engineering application value.
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Received: 07 September 2017
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| [1]李鹏,高振勋,蒋崇文.重叠网格方法的研究进展[J]. 力学与实践,2014,36(5):551-565. LI Peng,GAO Zhenxun, JIANG Chongwen. The progress of the overlapping grid techniques [J].Mechanics in engineering, 2014,36(5):551-565.(in Chinese)[2]张来平,邓小刚,张涵信.动网格生成技术及非定常计算方法进展综述[J]. 力学进展,2010,40(4):424-447. ZHANG Laiping,DENG Xiaogang,ZHANG Hanxin. Reviews of moving grid generation techniques and numerical methods for unsteady flow[J]. Advances in mechanics, 2010, 40(4):424-447.(in Chinese)[3]黄剑峰,张立翔,杨松,等.水轮机槽道内导叶动态绕流水力特性大涡模拟分析[J].农业工程学报, 2017,33(4): 125-130. HUANG Jianfeng, ZHANG Lixiang, YANG Song, et al. Analysis on hydraulic characteristics of dynamic flow around vane in hydro-turbine channel using large eddy simulation[J]. Transactions of the CSAE, 2017, 33(4): 125-130.(in Chinese)[4]张德良.计算流体力学教程[M].北京:高等教育出版社,2010.[5]STEGER J L, DOUGHERTY F C, BENEK J A. A chimera grid scheme[C]// Mini Symposium on Advances in Grid Generation, ASME, 1982.[6]徐文灿,胡俊.计算流体力学(上)[M].北京:北京理工大学出版社,2011.[7]阎超.计算流体力学方法及应用[M].北京:北京航空航天大学出版社,2006.[8]阎超,于剑,徐晶磊,等. CFD 模拟方法的发展成就与展望[J]. 力学进展,2011,41(5):562-589. YAN Chao, YU Jian, XU Jinglei, et al. On the achievements and prospects for the methods of computational fluid dynamics[J]. Advances in mechanics, 2011, 41(5):562-589.(in Chinese)[9]CARBONNE L, WINKLER N, EFRAIMSSON G. Use of full coupling of aerodynamics and vehicle dynamics for numerical simulation of the crosswind stability of ground vehicles[J].SAE Int J Commer Veh, 2016, 9(2):359-370.[10]THANHTOAN T, DONGHYUN K, JINSEOP S. Computational fluid dynamic analysis of a floating offshore wind turbine experiencing platform pitching motion[J]. Energies, 2014(7):5011-5026.[11]KOBLITZ A R, LOVETT S, NIKIFORAKIS N, et al. Direct numerical simulation of particulate flows with an overset grid method[J]. Journal of computational physics, 2017, 343:414-431.[12]VREMAN A W. A staggered overset grid method for resolved simulation of incompressible flow around moving spheres[J]. Journal of computational physics, 2017, 333:269-296.[13]ZHAO Ming, CAO Yihua. Numerical simulation of rotor flow field based on overset grids and several spatial and temporal discretization schemes[J]. Chinese journal of aeronautics, 2012, 25:155-163.[14]MARCO Agostino De, MANCINI Simone, MIRANDA Salvatore, et al. Experimental and numerical hydrody-namic analysis of a stepped planing hull[J]. Applied ocean research, 2017, 64:135-154.[15]王云海,钱凯,韩景龙. 不同结构垂直轴风力机叶片流动非定常数值模拟[J].太阳能学报, 2013,34(10):1697-1701. WANG Yunhai,QIAN Kai,HAN Jinglong. Unsteady numerical simulation on rotated flow of different vertical axis wind turbine shape[J]. Acta energiae solaris sinica, 2013, 34(10):1697-1701.(in Chinese)[16]陈荣钱,王旭,尤延铖. 短舱对螺旋桨滑流影响的IDDES数值模拟[J].航空学报,2016,37(6):1851-1860. CHEN Rongqian,WANG Xu,YOU Yancheng. Numerical simulation of nacelle′s effects on propeller slipstream based on IDDES model[J]. Acta aeronautica et astronautica sinica, 2016, 37(6):1851-1860.(in Chinese)[17]马山,葛文澎,段文洋. 基于重叠网格的C11集装箱船自由衰减横摇模拟[J]. 华中科技大学学报(自然科学版), 2017, 45(5):34-39. MA Shan,GE Wenpeng, DUAN Wenyang. Simulation of free decay roll for C11 container ship based on overset grid[J]. J Huazhong Univ of Sci &Tech(natural scien-ce edition), 2017, 45(5): 34-39.(in Chinese)[18]徐丽,翁培奋,吴泉军,等. 用鲁棒Riemann求解器和运动重叠网格计算旋翼粘性绕流[J]. 计算力学学报,2014,31(4):526-531. XU Li, WENG Peifeng, WU Quanjun, et al. A robust Riemann solver and moving overset grids for visous flow computation of rotors[J].Chinese journal of computational mechanics, 2014,31(4):526-531.(in Chinese)[19]赵发明, 高成君, 夏琼. 重叠网格在船舶CFD 中的应用研究[J]. 船舶力学,2011,15(4):332-341. ZHAO Faming, GAO Chengjun, XIA Qiong. Overlap grid research on the application of ship CFD[J]. Journal of ship mechanics, 2011, 15(4):332-341.(in Chinese)[20]舒朝晖,段亚雄,童泽昊,等.采用不同湍流模型计算贯流风机内流场的比较分析[J].流体机械,2018,46(2):19-23. SHU Zhaohui, DUAN Yaxiong, TONG Zehao, et al. Comparsion of turbulence models on calculation of risner flow field of the cross flow fan [J]. Fluid machinery, 2018, 46(2): 19-23.(in Chinese)[21]江帆,黄鹏. Fluent高级应用与实例分析[M]. 北京:清华大学出版社, 2008. |
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