Effect of Rotational Speed on the Stability of Two Rotating Side-by-side Circular Cylinders at Low Reynolds Number  

作　　者：DOU Huashu ZHANG Shuo YANG Hui SETOGUCHI Toshiaki KINOUE Yoichi 

机构地区：[1]Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University [2]Department of Mechanical Engineering, Saga University

出　　处：《Journal of Thermal Science》2018年第2期125-134,共10页热科学学报（英文版）

基　　金：supported by National Natural Science Foundation of China(51579224);Zhejiang Province Key Science and Technology Innovation Team Project(2013TD18);Zhejiang Province Science and Technology Plan Project(2017C34007)

摘　　要：Flow around two rotating side-by-side circular cylinders of equal diameter D is numerically studied at the Rey- nolds number 40〈 Re 〈200 and various rotation rate 8i. The incoming flow is assumed to be two-dimensional laminar flow. The governing equations are the incompressible Navier-Stokes equations and solved by the finite volume method （FVM）. The ratio of the center-to-center spacing to the cylinder diameter is T/D=2. The objective of the present work is to investigate the effect of rotational speed and Reynolds number on the stability of the flow. The simulation results are compared with the experimental data and a good agreement is achieved. The stability of the flow is analyzed by using the energy gradient theory, which produces the energy gradient function K to identify the region where the flow is the most prone to be destabilized and the degree of the destabilization. Numerical results reveal that K is the most significant at the separated shear layers of the cylinder pair. With Re in- creases, the length of the wake is shorter and the vortex shedding generally exhibits a symmetrical distribution for θi〈θcrit. It is also shown that the unsteady vortex shedding can be suppressed by rotating the cylinders in the counter-rotating mode.

关 键 词：numerical simulation rotating circular cylinders STABILITY vortex interactions energy gradient theory 

分 类 号：O35[理学—流体力学]