Structural grid division method for simulating tunnel train movement based on dynamic grid

Abstract

The invention discloses a structural grid division method for simulating tunnel train movement based on a dynamic grid. The method mainly comprises the steps of establishing a geometric model according to the actual movement condition of a train in a tunnel, taking the geometric model as a whole drainage basin, and dividing the whole drainage basin into a static domain and a motion domain by establishing an interaction surface, respectively establishing topological structures of a static domain and a motion domain, respectively carrying out structured grid division on the topological structure of the static domain and the topological structure of the motion domain, and carrying out encryption processing on a boundary layer regional grid positioned at a near wall surface in the process of carrying out structured grid division, and finally, merging the static domain grid and the motion domain grid in the processed geometric model. According to the structural grid division, the number of grids is reduced, and the calculation efficiency is improved; the boundary layer and the train surface can be encrypted; according to the method, the boundary layer grid size can be calculated through the Y+ method, the grid size is set, model reconstruction can be avoided, and the calculation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of fluid machinery, in particular to a preprocessing method for dynamic numerical simulation of an unsteady flow field. Background technique [0002] Urban rail transit is the development direction of modern metropolitan transportation. The development of rail transit is an effective way to solve the problems of big cities, and it is also an effective way to build green cities and smart cities. At present, the development of underground urban rail transit is facing many outstanding problems: the speed of operation increases, and the sealing performance of conventional vehicles cannot meet the requirements, causing discomfort to passengers in the carriages; the size and form of tunnel sections, and the lack of key technologies such as air valve pressure. These problems seriously restrict the development of high-speed subway. [0003] In the absence of standards and lack of measured data, the research on the...

AI Technical Summary

Problems solved by technology

At present, the development of underground urban rail transit is facing many outstanding problems: the speed of operation is increased, and the sealing performance of conventional vehicles cannot meet the requirements, causing discomfort to passengers in the compartment; the size and form of the tunnel section, the lack of key technologies such as air valve pressure

For the full-scale flow field model, the division of unstructured grids greatly increases the number of grids, and the local grid quality is poor

For unstructured grids, the dynamic grid update method can use the smoothing method, but if the movement boundary displacement is too large, the smoothing method may lead to a decrease in grid quality, or even negative volume grids, resulting in calculation errors. Difficulty setting up grids

Images