【摘要】 基于N-S方程,采用Galerkin方法加权的三步有限元方法.本文对不可压缩粘性流体的圆柱绕流问题作了分析。同时对于高雷诺数下的紊流,引入大涡模拟数值模型。程序比较成功地模拟了平底边界条件及有沟槽复杂边界条件下的海底管线的受力情况。在圆柱绕流力的过程线模拟计算中,对有一定缝隙比、平底裸置以及置于沟槽内的圆柱均进行了数值计算并和试验资料及已有文献作了对比,结果令人满意。更多还原

【Abstract】 Based on Navier-Stokes Equation , a Three-Step Finite Element Method is applied to solve the pipeline problem in incompressible viscous fluid flows. For turbulent flow in high Reynolds number, the large Eddy Simulation Method was applied. The problem works Well in simulating the forces on pipelines close by plane boundary or laid in trenches. When there is a gap between pipeline and bottom , the results given by numerical simulation are satisfactory in both cases of pipes laid on plane boundary condition and in trench condi tion, arid the results are compared with the data from experiment and existing literature.更多还原