Variable difference and relative displacement-based r-type grid adaptive movement method and equipment

Abstract

The invention discloses a variable difference and relative displacement-based r-type grid adaptive movement method and equipment, two kinds of parameters including the variable difference of normalized grid points and the relative displacement of the grid points are used as a weight function for calculating the movement of the grid points, and the following movement of the grid points is realized by adding the weight function, namely the relative displacement of the grid points. The influence of the magnitudes and dimensions of the two types of parameters on the movement amount of the grid points is eliminated by normalizing, a new combined weight is formed by the two types of parameters so as to determine the displacement of the grid points near the shock wave, and the displacement information of the grid points near the shock wave is transmitted to the adjacent grid points of the grid points. Several rows of grid points near the shock wave can synchronously move to the shock wave position. By normalizing the physical quantity and the grid point position movement amount, the influence of two types of parameter values and dimensions on the grid point movement amount is eliminated, the grid points at the shock wave position can be effectively close to the shock wave position, and meanwhile it can be guaranteed that several rows of grid points near the shock wave synchronously move to the shock wave position.

Description

technical field [0001] The invention relates to the technical field of computational fluid dynamics, in particular to an r-type grid self-adaptive moving method and equipment based on variable difference and relative displacement. Background technique [0002] Currently, mesh generation in computational fluid dynamics has become one of the main tasks for engineers to numerically simulate the internal and external flow fields of aircraft. The rationality of the grid distribution directly affects the resolution of the flow field and the simulation accuracy. Therefore, CFD engineers need to have a higher understanding of the flow field characteristics of the current simulation conditions when generating the grid, including the position of the shock wave, the position and size of the separation zone Wait. The grid distribution generated by different CFD engineers is inconsistent, resulting in differences in numerical simulation results. How to weaken the influence of grid distr...

AI Technical Summary

Problems solved by technology

This moving calculation method can realize the movement of the grid points to the shock wave, but the movement of the second layer of grid points connected to the grid points on the same side of the shock wave is very small, and the final result is that only the layer across the shock wave is encrypted The grid, the grid near the shock wave is not followed and refined, and the resolution of the flow field is limited.

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