Compressible fluid numerical simulation method

Abstract

The invention is applicable to the field of computational fluid mechanics, and provides a compressible fluid numerical simulation method which comprises the following steps: S10: reading physical variable distribution, boundary conditions and test duration of computational grids and moments; s20, on the computational grid, obtaining a conservation variable and a convection flux according to the physical variables of the moments; s30: respectively calculating the convection flux, the numerical flux in the physical space, and the numerical flux in the physical space; s40, substituting the conservation variable and the numerical flux into a discrete Euler equation to obtain a conservation variable at the n + 1 moment and a corresponding physical variable; and S50, n is traversed from 1-k, k is the serial number of the test duration at the moment, and the conservation variable and the physical variable at the moment serve as the final test result. By means of the method, the calculation efficiency is improved, the essential oscillation-free characteristic during numerical calculation is guaranteed, and stable calculation is achieved.

Description

technical field [0001] The invention relates to the field of computational fluid dynamics, in particular to a numerical simulation method of compressible fluid. Background technique [0002] Research on the numerical simulation of the three-dimensional complex flow of aircraft is currently a hot topic in the forefront of computational fluid dynamics, and it is also an important requirement in engineering applications. Computational fluid dynamics provides great support for the low-cost study of real flow phenomena. Comparing with traditional wind tunnel tests, computational fluid dynamics technology has the advantages of low calculation cost and high simulation degree of flight atmospheric environment. It can obtain more accurate aerodynamic characteristics at a low calculation cost, and provide fast and accurate information for subsequent aircraft related designs. guidance. [0003] The convection-diffusion equation is a kind of basic governing equation commonly used in vi...

AI Technical Summary

Problems solved by technology

[0007] When using the weighted intrinsically non-oscillating scheme to solve the Euler equations, you can use the component weighted intrinsically non-oscillating scheme, that is, solve the component formal equations in the physical space, but this will still produce numerical oscillations; you can also use the characteristic weighted intrinsically non-oscillating scheme. Oscillation format, that is, to solve the characteristic form equation in the characteristic space, which can better suppress the oscillation, but involves matrix calculations such as characteristic transformation, and the calculation amount is too large

Images