Volume 37, Number 1, February 2019
|Page(s)||70 - 79|
|Published online||03 April 2019|
Numerical Simulation of Nonlinear Flow Based on Element-Free Galerkin Method
Key Laboratory for Unmanned Underwater Vehicle, School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
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This paper focuses on the studying on some flow problems of nonlinear based on the Element Free Galerkin method. First the Navier-Stokes equation is discretized with the Galerkin method. The inertial term in the equation is discretized with the method of the speed term and direct deduction respectively. And the penalty function method is used to deal with the pressure and the essential boundary condition in the equation, and the discretization of two-dimensional N-S equation based on the EFG method is established. Then the flow problem of stationary nonlinear is studied. The flow problem of water in the rectangular domain squeezed by the two plates distributed above and below the calculated domain is studied with the method of EFG. The accuracy of the direct linear alternating interation method is shown by contrast with the analytical solution. Then the flow problem of unsteady nonlinear is studied. The θ-weighted method is used to discrete the time term of the N-S equation and the unsteady nonlinear solution matrix of EFG is established. The flow problem of flow around the square column is studied with the method of EFG and the flows under a series of low Reynolds are stimulated.
Key words: element-free Galerkin method / penalty function method / Navier-Stokes equation / direct linear alternating interation method
关键字 : 无网格伽辽金法 / 罚函数法 / Navier-Stokes方程 / 直接线性交替迭代法
© 2019 Journal of Northwestern Polytechnical University
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