Flow Past a Rotationally Oscillating Cylinder

Autor: Cheng-Yu Hou, 侯承佑
Rok vydání: 2006
Druh dokumentu: 學位論文 ; thesis
Popis: 94
Cross flow past a rotationally oscillating circular cylinder is studied by numerical modeling of the two-dimensional incompressible Navier-Stokes equations using primitive variables. The main non-dimensional parameters are Reynolds number, rotational amplitude, and rotational frequency. This model was verified by comparing with Mahfouz’s results. The domain of the rotational frequency were reasonably divided into lock-on, buffer, and non-lock-on regions according to the energy of the lift force at different rotational frequency. The extent of the lock-on region increased with the Reynolds number and the rotational amplitude. The effect of rotational amplitude was much larger than the Reynolds number. The peaks of lift and drag both appeared in lock-on region. A local minimum showed up at both low and high buffer regions. Other flow characteristics at different value of the non-dimensional parameter were also discussed.
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