Parawing fluid-solid coupling numerical simulation method based on compressible flow immersion boundary method

Abstract

The invention discloses a parafoil fluid-solid coupling numerical simulation method based on a compressible flow immersion boundary method, which comprises the following steps of: establishing a space background grid and a parafoil flow field grid, embedding the parafoil grid into the space background grid, performing grid encryption near a parafoil position, and simulating the parafoil flow field grid. Determining the intersection condition of the parafoil grid and the space background grid through a geometric intersection method, generating a structural finite element grid of the parafoil, and establishing a corresponding relation with the parafoil flow field grid; a compressible Navier-Stokes equation on a space background grid is solved by using a finite volume method, in boundary condition processing, the parafoil adopts a non-slip wall surface boundary condition, and a one-dimensional semi-Riemann problem is calculated by using an FIVER method to obtain flux on a parafoil boundary; the flow field aerodynamic force obtained through calculation acts on the parafoil, structural deformation and motion of the parafoil are solved through a nonlinear structural dynamics finite element method, and the position of a parafoil grid is updated; important reference is provided for analysis and research of the working process of the parafoil.

Description

technical field [0001] The invention relates to a fluid-solid coupling numerical simulation technology, in particular to a parafoil fluid-solid coupling numerical simulation method based on a compressible flow immersed boundary method. Background technique [0002] Parachute is the most commonly used pneumatic deceleration device at present. It is widely used in national defense construction, scientific research, economic construction, sports and other fields, especially in the safe return and entry of spacecraft, as well as accurate airdrop and airdrop. Important equipment for the safe landing of supplies. With the development of aerospace technology, higher requirements have been put forward for parachutes, and parafoils have gained more and more attention because of their excellent gliding performance and maneuverability. Therefore, the research of parafoil plays an important role in the development of my country's aviation field. [0003] The parafoil is composed of fl...

AI Technical Summary

Problems solved by technology

[0005] Since the working process of the parafoil involves a very complex problem of unsteady fluid-structure interaction with large deformations of flexible fabrics, the body-fitted mesh method is almost completely ineffective

In particular, parafoils are different from conventional objects and are regarded as "zero-thickness" objects, which brings great difficulties to numerical simulation

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