基于AMReX框架的重叠网格方法研究

该文发展基于自适应直角坐标网格的重叠网格算法。背景网格使用直角坐标网格,在AMReX框架上实现直角坐标网格的自适应,物面附近的子网格使用混合网格,使用RANS方程作为控制方程,采用HLLC格式计算对流通量,湍流模型使用Spalart-Allmars模型,时间推进使用双时间步长方法,使用ONERA M6标准算例检验算法的精度。使用基于物面距的自动网格装配方法,详细说明该方法的实现过程。最后使用低速直机翼流动算例进行验证,结果表明,该文发展的基于自适应直角坐标网格的重叠网格方法具有较高的精度和实用价值。

In this paper,an overlapping grid algorithm based on adaptive Cartesian grid is developed.The background grid uses Cartesian coordinate grid,and the adaptive Cartesian coordinate grid is realized in AMReX framework.The subgrid near the object surface uses hybrid grid,RANS equation as governing equation,HLLC scheme to calculate convective flux,Spalart-Allmars model for turbulence model,dual time step method for time advance,and ONERA M6 standard example to verify the accuracy of the algorithm.Using the automatic mesh assembly method based on object-plane distance,the implementation process of this method is described in detail.Finally,a low-speed straight wing flow example is used to verify the results.The results show that the overlapping grid method based on adaptive Cartesian grid developed in this paper has high accuracy and practical value.