주기 회전하는 원형 실린더 주위 층류 유동장의 수치 시뮬레이션
Numerical Simulation on Laminar Flow Past a Rotary Oscillating Circular Cylinder
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Abstract
The effects of rotary oscillation on the unsteady laminar flow past a circular cylinder are numerically investigated in the present study. The numerical solutions for the 2D Navier-Stokes equation are obtained using a finite volume method in the framework of an overlapping grid system. The vortex formation behind a circular cylinder and the hydrodynamics of wake flows for different rotary oscillation conditions are analyzed from the results of numerical simulation. The lock-on region is defined as the region that the natural shedding frequency due to the Karmann Vortex shedding and the forcing frequency due to the forced oscillating a cylinder are nearly same, and the quasi-periodic states are observed around that region. At the intersection between lock-on and non-lock-on region the shedding frequency is bifurcated. After the bifurcation, one frequency follows the forcing frequency and the other returns to the natural shedding frequency. In the quasi-periodic states, the variation of magnitudes and relevant phase changes of with forcing phase are examined.
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