FLOW FIELD ANALYSES OF PLANE JET AT LOW REYNOLDS NUMBERS USING LATTICE BOLTZMANN METHOD  

采用格子Boltzmann方法对低雷诺数平面射流的流场分析(英文)

作　　者：赵立清[1] 孙建红[1] 许常悦[1] 

机构地区：[1]南京航空航天大学航空宇航学院

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2012年第3期199-206,共8页南京航空航天大学学报（英文版）

基　　金：Supported by the National Nature Science Foundation of China(10472046);the Scientific Innova-tion Research of College Graduate in Jiangsu Province(CX08B-035Z);the Innovation and Excellence Foundation of Doctoral Dissertation of Nanjing University of Aeronautics and Astronautics(BCXJ08-01)~~

摘　　要：A two-dimensional（2-D） incompressible plane jet is investigated using the lattice Boltzmann method（LBM） for low Reynolds numbers of 42 and 65 based on the jet-exit-width and the maximum jet-exit-velocity. The results show that the mean centerline velocity decays as x-1/3 and the jet spreads as x2/3 in the self-similar region, which are consistent with the theoretical predictions and the experimental data. The time histories and PSD analyses of the instantaneous centerline velocities indicate the periodic behavior and the interaction between periodic components of velocities should not be neglected in the far field region, although it is invisible in the near field region.采用格子Boltzmann方法对雷诺数(基于射流出口宽度和出口最大速度)为42和65的二维不可压缩平面射流进行了数值模拟。研究结果表明,在射流的自相似区,射流中心轴线速度按-1/3指数规律衰减并且射流按2/3指数率扩展,与理论分析及实验结果吻合。在射流的远场区域,中心轴线上瞬态速度的时间历程与频谱分析展示出速度的周期变化特性,并且周期性分量引起的相互作用不应被忽略;相比较而言,速度的周期性分量在近场区不明显。

关 键 词：plane jet low Reynolds number lattice Boltzmann method 

分 类 号：O358[理学—流体力学]