Boundary Layer Mesh Generation Based on Template Construction Method

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AbstractThe quality of the boundary layer mesh plays a very important role in the computational fluid dynamics (CFD) numerical calculation of the aircraft. The traditional boundary layer generation method, advancing-layers method, removes the element or stops advancing when generating the boundary layer grid at the ridge or corner, which leads to the uneven size of the grid on the outer surface of the boundary layer and seriously affects the quality of the grid. To address this problem, this paper proposes a method of generating boundary layer mesh by template construction. The novelty of this method is to establish a constraint framework to wrap the features at the ridge or corner, and then generate high-quality orthogonal mesh internally by specifying the direction of grid lines. In this method, a constraint framework is established to ensure the smooth transition of the boundary layer mesh, and cubic spline interpolation is used to control the quality of the internal mesh. This method can effectively avoid the problem of generating boundary layer mesh at ridge or corner by traditional methods, and is verified by experiments on two-dimensional NACA6412 model, which can effectively ensure the quality of boundary layer mesh.KeywordsBoundary layer meshAdvancing-layers methodTemplate construction