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

A fluid-solid coupling and numerical simulation technology, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve problems such as difficult numerical simulation, failure of body-fitted grid method, etc., and achieve wide applicability Effect

Pending Publication Date: 2022-03-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Parawing fluid-solid coupling numerical simulation method based on compressible flow immersion boundary method
  • Parawing fluid-solid coupling numerical simulation method based on compressible flow immersion boundary method
  • Parawing fluid-solid coupling numerical simulation method based on compressible flow immersion boundary method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] The invention utilizes the advantages of the immersed boundary method in nonlinear large deformation fluid-solid coupling simulation to deal with the parafoil fluid-solid coupling problem, and provides an important reference for the design and analysis of the parafoil.

[0036] refer to figure 1 , the present embodiment provides that the present invention provides a parafoil fluid-structure coupling numerical simulation method based on the compressible flow immersed boundary method, which specifically includes:

[0037] Step 1: Establish the flow field grids of the parafoil surface and space area. For the parafoil shape, select triangle elements to mesh the parafoil geometric model, and determine the required grid number based on the local characteristics of the parafoil. A certain number of parafoil surface mesh elements are generated,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/28
CPCG06F30/23G06F30/28G06F2111/10G06F2113/08G06F2119/14
Inventor 高宜胜张红英陆伟伟胡雪鹏刘琦黄及水童明波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products