Warping phenomenon elimination method in interactive prism grid generation

Abstract

The invention discloses a method for eliminating a warping phenomenon in interactive prism grid generation. The method comprises the following steps: firstly, artificially interacting to generate a space propulsion grid of product surface grid boundary points; fairing components of propulsion normal vectors of boundary points of the object plane grid in X, Y and Z coordinate directions by using afairing algorithm, interpolating by using a radial basis function method to obtain a space propulsion grid of internal points of the object plane grid, and finally assembling to obtain a boundary layer prism grid for CFD calculation simulation; according to the method, an object plane grid boundary space propelling plane grid generated through manual interaction is optimized, the influence of thewarping phenomenon on the quality of the prism grid is eliminated through the technologies of normal vector fairing, radial basis function interpolation and the like, and the method has obvious technical advantages in the aspect of improving the generation efficiency of the prism grid and the universality of the method.

Description

technical field [0001] The invention relates to the field of grid generation for numerical calculation, in particular to the field of prism grid generation in CFD (Computational Fluid Dynamics). Background technique [0002] With the rapid development of computer hardware technology and calculation methods, CFD (Computational Fluid Dynamics) plays an increasingly important role in scientific research and industrial product design, and is widely used in real flow of various complex shapes. Numerical Simulation. Especially in the field of aerospace, CFD has become an important tool for aircraft performance analysis and design. [0003] CFD discretizes the spatial flow field of the simulated object based on the grid, and then solves the discrete mathematical equation to obtain the numerical flow field of the simulated object under specific conditions. Discrete grid quality is a key factor affecting the efficiency, convergence and accuracy of CFD numerical solutions. A high-q...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for eliminating warping phenomenon in interactive prism grid generation, aiming at the situation that the method for eliminating warping phenomenon by adding a space propulsion surface grid at the local position of the object surface grid has poor universality and increased algorithm difficulty, The smoothing method is used to smooth the advancing normal vector of the boundary point of the object surface grid, and eliminate the discontinuous amplification and propagation of the advancing normal vector of the boundary point of the object surface mesh, thereby avoiding the warping phenomenon of the prism grid, which can greatly improve the interaction Robustness and adaptability to complex shapes of prismatic mesh generation method

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