摘要
当分形湍流发展至均匀状态后,为了研究流场的传质输运特性,通过标记流场不同区域的流体颗粒,采用TS13插值方式获取流体微元的拉格朗日位置和速度,探索示踪粒子的运动规律.与此同时,模拟了具有相同阻塞率的规则流场进行对比分析.数值结果表明:由于分形流场边界处的大尺度运动明显,其示踪粒子沿流场运动的平均位移波动范围比规则流场更大.同时,两类流场边界处的流体粒子在演化过程中都会朝着流场中心区域运动.此外,分形流场的大尺度运动使得示踪粒子沿法/展向的扩散能力更强,最终导致分形流场的示踪粒子沿法/展向运动的平均路程约为规则流场的3倍.
To study the mass transport characteristics in the temporal evolution of FGT,when the fractal flow field evolves to statistically homogeneous state, the fluid particles in different regions of the flow field are marked, and the Lagrange position and velocity of the fluid element are obtained by TS13 interpolation method to explore the motion law of the tracer particles.At the same time, the regular flow field with the same blockage ratio was simulated for comparative analysis.The numerical results show that due to the obvious large-scale motion at the boundary region of the fractal flow field, the mean displacement fluctuation range of the tracer particles moving along the streamwise is larger than that of the regular flow field.Meanwhile, the fluid particles in the boundary region of the two kinds of turbulence move towards the central region of the flow field during the evolution process.In addition, the large-scale motion of fractal flow field makes the diffusion ability of the tracer particles along the normal/span direction stronger, resulting in the mean distance of the tracer particles along the normal/span direction of fractal flow field is about three times that of the regular flow field.
作者
石均
陶善聪
周毅
SHI Jun;TAO Shancong;ZHOU Yi(School of Energy and Power Engineering,Nanjing University of Science and Technology',Nanjing Jiangsu 210094;China Academy of Aerospace Aerodynamics,Beijing 100074)
出处
《东北电力大学学报》
2022年第2期49-61,共13页
Journal of Northeast Electric Power University
基金
国家自然科学基金(11802133,91952105)
江苏省自然科学基金(BK20180454)
江苏省六大人才峰会项目(2019-SZCY-005)
中央高校基本科研业务费专项资金资助(30921011212)。
关键词
分形网格湍流
时间演化
TS13插值格式
传质输运特性
Fractal-generated turbulence
Temporally evolving
TS13 interpolation scheme
Mass transport characteristics
