Numerical Simulations of Vortex Shedding of a Circular Cylinder Experiencing Oscillatory Flow at Low Keulegan-Carpenter Numbers

摘要

In the past decades, sinusoidal motion of a circular cylinder inviscous flow had been extensively studied by researchers allaround the world. While difference of flow patterns existsbetween fixed cylinder and freely vibrating cylinder. In thispaper, numerical simulations are carried out by the in-houseCFD code naoe-FOAM-SJTU with overset grid capability,which is developed based on the open source codeOpenFOAM. The diameter of the cylinder is 0.02m and theKC numbers vary from 3 to 15. Results of vortex evolution,flow regimes and separation points of the cylinder with crossflowfreedom restricted and freely vibrating are compared.