地效飞行器三维地面效应的数值模拟

采用三维非结构贴体直角网格和N-S方程研究了三维地面效应的数值计算方法。用最小二乘法对N-S方程进行了MUSCL有限体积法的粘性求解,提出了带约束边界条件的最小二乘法的处理办法,修正了下垫面的数值边界条件,模拟了下垫面在低马赫数情况下对飞行器的地面效应作用。结果表明计算方法可以反映地面效应的基本原理和特性,模拟结果显示飞行器的地面效应不仅有正效应,而且可能有负效应。

Three-Dimension Numerical Simulation of the Ground Effect on the Ground Effect Vehicle

One numerical calculation method is studied by using the three-dimension unstructured cartesian grid and N-S equations.The viscous solution of N-S equations is achieved by using the least square method and the MUSCL finite volume method.A method dealing with the edge-restraint condition of the least square method is presented,the boundary condition of the surface is corrected,the ground effect that surface acts on the flying vehicle in low Mach number is simulated.The researching result shows that the basic principle and character of the ground effect can be reflected by the calculation method.The result of simulation illuminates that the ground effect of flying vehicle not only can be positive effect,but also can be negative effect.