关键词: 有限元方法, 时间离散, 动量特征线

Abstract: An Explicit Temporal Discretization Characteristic Based Split Algorithm and Its Application for Flow Past Bluff BodyZHAO Yaojun，ZHOU Dai,LI Lei(School of An explicit temporal discretization characteristic based split (CBS) algorithm was developed along the characteristic of the momentum equation with holomorphic differential form and by introduction of the coordinate transformation on the characteristic of the momentum. In the developed algorithm, the second order time precision is reached and the properties of the original CBS technique are remained. Furthermore, a series of the numerical simulation of unsteady flow with low Renolds number past a circular cylinder and a square cylinder was carried out by present algorithm and some comparisons between computational and experimental results of both drag and lift coefficients of bluff bodies were made. Finally, the flow fields around a single circular cylinder and two circular cylinders with sidebyside arangement were numerically investigated respectively. It is showed that the present algorithm is fit for the simulation of flow field with low Renolds number.