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CFD (computational fluid dynamics)/CSD (circuit switch data) coupled solving nonlinear aeroelasticity simulation method

A simulation method and aeroelastic technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as structural nonlinear coupling and aerodynamic nonlinearity

Inactive Publication Date: 2011-04-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to overcome the inability of the existing technology to deal with the nonlinearity of the flow field and the nonlinearity of the structure, the present invention provides a CFD / CSD coupling time-domain simulation method, which adopts the idea of ​​CFD / CSD loose coupling, and calculates information transmission and dynamic Mesh technology realizes the time-domain coupling between fluid and solid, solves the problem of aerodynamic nonlinearity, structural nonlinear coupling and geometric large deformation dynamic mesh problem, and can be applied to nonlinear aeroelastic analysis of aerospace vehicles and civil Nonlinear Aeroelastic Analysis of Tall Buildings and Bridges

Method used

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  • CFD (computational fluid dynamics)/CSD (circuit switch data) coupled solving nonlinear aeroelasticity simulation method
  • CFD (computational fluid dynamics)/CSD (circuit switch data) coupled solving nonlinear aeroelasticity simulation method
  • CFD (computational fluid dynamics)/CSD (circuit switch data) coupled solving nonlinear aeroelasticity simulation method

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Embodiment Construction

[0095] Method embodiment: Taking the analysis of the aeroelastic integration of a wing with a large aspect ratio as an example, and referring to the flow chart of the attached drawing, the specific implementation method of solving the nonlinear aeroelastic problem by using CFD / CSD coupling is explained.

[0096] Step 1: Calculation initialization

[0097] (1) The origin of the coordinates is taken at the apex of the leading edge of the wing, the X-axis points to the rear along the chord length, the Y-axis is perpendicular to the X-axis, and the Z-axis is along the span length direction. Use CAD software to build a three-dimensional solid model. The wing is riveted by two spars, wing ribs, stringers, skin and other components. The ribs are riveted on the web of the spar, and the stringers are riveted on the skin. , the skin is riveted on the spars, ribs and other components;

[0098] (2) Import the CAD solid model and divide the resulting finite element mesh of the wing. There...

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Abstract

The invention discloses a CFD (computational fluid dynamics) / CSD (circuit switch data) coupled solving nonlinear aeroelasticity simulation method, comprising: firstly, carrying out calculation initialization; then solving the CFD of unsteady aerodynamic force; converting boundary load information; solving the CSD of nonlinear structure dynamic response; judging whether to exist computation or notby taking the response of structural finite-element mesh point displacement as a convergence criteria; if not exiting, carrying out the dynamic mesh deformation of a flow field after the surface displacement information of a computation model is converted; and then, continuing to compute until the convergence criteria is satisfied, thus finishing computation. By means of the simulation method disclosed by the invention, the problem of pneumatic nonlinearity and structural nonlinearity coupling and the problem of geometric large deformation dynamic mesh can be solved; and the simulation methoddisclosed by the invention can be applied on the nonlinear aeroelasticity analysis of aerospace aircrafts and the nonlinear aeroelasticity analysis of civil high-rise buildings and bridges.

Description

technical field [0001] The invention belongs to mechanical numerical simulation. CFD / CSD coupling involves computational fluid dynamics, computational structural dynamics and computer programming technology. It is mainly used in aircraft aeroelastic analysis. Background technique [0002] Aeroelasticity mainly studies the coupling between elastic structural deformation and aerodynamic action in the flow field. This coupling causes aeroelastic problems of the aircraft, such as control surface reversal, wing divergence, buffeting, flutter and other dynamic responses. , ranging from shortening the fatigue life, to destroying the aircraft. At present, there is no technical condition to solve this kind of problems by using ground experiments. Therefore, numerical simulation is a practical way to save material and labor, and has important practical application value. [0003] In the nonlinear aeroelasticity problem, two different physical fields, the structural field and the ae...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 安效民徐敏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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