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Dynamic fluid field hybrid analysis method of fabric fluid structure interaction model

A technology of fluid-solid coupling model and analysis method, which is applied in the field of dynamic flow field mixing analysis of the fluid-solid coupling model of fabrics, can solve problems such as insurmountable limitations, difficulty in implementing FLUENT, and difficulty in accurately describing flow field details, and achieve accurate dynamic flow. Flow field details, reliable results

Inactive Publication Date: 2011-04-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Since the working process of the fabric belongs to a typical fluid-solid coupling and strongly nonlinear time-varying system, its structural analysis belongs to the structural dynamics problem of instantaneous large deformation in which geometric nonlinearity and material nonlinearity coexist, and the study of flow field belongs to the large deformation of flexible folded bodies. The coupling study is very difficult for turbulent flow problems
In China, many scholars have studied the working process of airbags and achieved certain results, but there are few studies on the working process of fabrics in complex folding states based on the flow field structure coupling method, especially the dynamic changes of the flow field. Law is a blind spot in research
LS-DYNA finite element analysis software is an excellent explicit dynamic analysis software, which has been well applied in many fluid-solid coupling problems, but due to the limitations of its flow field model, it is difficult to accurately describe the details of complex flow fields
The FLUENT software is an excellent flow field analysis software, but the movement of the fabric under the action of high-speed fluid is a random process, and it is difficult to use functions to describe the movement trajectory of each node, so it is difficult to realize the dynamic grid calculation using FLUENT
For the dynamic flow field analysis of the fluid-structure interaction model of flexible fabrics, no matter which software is based on, its limitations cannot be overcome

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
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  • Dynamic fluid field hybrid analysis method of fabric fluid structure interaction model
  • Dynamic fluid field hybrid analysis method of fabric fluid structure interaction model
  • Dynamic fluid field hybrid analysis method of fabric fluid structure interaction model

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Experimental program
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Embodiment Construction

[0035] The following takes the inflation and deployment process of a folded airbag as an example to analyze the flow field mixing

[0036] First, based on the HYPERMESH platform, the structural model in the initial gas-filled state required for LS-DYNA fluid-solid coupling analysis was established ( figure 1 ). Airbag thickness 1 mm , when full of gas, the length, width and height are 1 m ,1 m , 0.5 m , whose basic parameters are shown in Table 1.

[0037] The mass flow rate is used as the inlet boundary condition, the pressure outside the capsule is constant, and the flow field inside the capsule adopts the no-reflection boundary condition. The dynamic changes of capsule structure were obtained by LS-DYNA calculation.

[0038] Export the instantaneous shape and movement speed of each unit in the fabric inflation process and the pressure curve of the inflation port ( figure 2 ). A body-fitted mesh of the flow field in the bag is established for each instantaneous sha...

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
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Abstract

The invention discloses a dynamic fluid field hybrid analysis method of a fabric fluid structure interaction model, which adopts the calculation steps of: 1. building a fabric three-dimensional mesh model; 2. carrying out dynamic analysis on the fabrics by an ALE (Arbitrary Lagrangian-Eulerian) method based on LS-DYNA to obtain the fabric dynamic change condition; 3. using an instant fabric appearance as the fluid boundary condition and dividing fit mesh; and 4. carrying out fluid field analysis on the basis of FLUENT. The invention uses the ALE method (Arbitrary Lagrangian-Eulerian) based onthe LS-DYNA for the first time to obtain the dynamic fabric shape as the FLUENT boundary condition to analyze the fluid field condition, and the problems that the ALE method has inaccurate fluid field description and the dynamic mesh fluid field is difficult to calculate under the great deformation of flexible fabric are effectively solved.

Description

technical field [0001] The invention relates to the dynamic analysis of the flow field in the fluid-solid coupling of folded fabrics. For the first time, the LS-DYNA / FLUENT hybrid analysis method can obtain more accurate flow field conditions when the fabric changes dynamically. It solves the problem of calculating the flow field of the dynamic grid under the inaccurate description of the flow field by the ALE method and the large deformation of the flexible fabric. Background technique [0002] The flow field of the fabric under the action of high-speed fluid changes drastically, and the influence of the flow field structure must be considered. The fluid-solid coupling method has become an important means for the study of the fabric working process. Since the working process of the fabric belongs to a typical fluid-solid coupling and strongly nonlinear time-varying system, its structural analysis belongs to the structural dynamics problem of instantaneous large deformation ...

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
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 余莉程涵刘雄张绳呼政魁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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