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An Adaptive Mesh Control Method for Numerical Simulation of Fluid-Structure Interaction

An adaptive grid, numerical simulation technology, applied in special data processing applications, electrical digital data processing, instruments, etc., can solve problems such as reducing the amount of calculation, reduce the amount of calculation, improve the accuracy of numerical calculation, reduce the number of Effect

Inactive Publication Date: 2017-08-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an adaptive grid control method suitable for fluid-solid coupling numerical simulation of the actual parachute drop process. The local flow field around the parachute is adaptively tracked, so as to overcome the limitation of the spatially fixed flow field grid on the parachute airdrop movement range in the existing numerical simulation method, and effectively reduce the calculation amount, and realize the large-scale movement of the parachute airdrop Numerical simulation of fluid-structure interaction with fast process and high precision

Method used

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  • An Adaptive Mesh Control Method for Numerical Simulation of Fluid-Structure Interaction
  • An Adaptive Mesh Control Method for Numerical Simulation of Fluid-Structure Interaction

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[0013] Such as figure 1 As shown, the single-parachute object drop system generally has a relatively large initial horizontal velocity, and therefore undergoes large changes in attitude and position during the entire airdrop parachute opening process (a)-(c). By assigning the velocity vector of the parachute line intersection point to the flow field grid, the flow field grid can track the entire range of motion of the parachute system; on the other hand, by passing the parachute line intersection point to the center point of the parachute top hole It is used to determine the spatial attitude of the flow field grid to ensure that the central axis of the flow field in each stage of the process of Figures (a)-(c) is approximately the same as the axis of the parachute system; at the same time, in (a)-(c) In the process of ), the radial size of the flow field grid is automatically scaled according to the projected area of ​​the canopy. This makes the flow field grid always have a rel...

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Abstract

An adaptive grid control method suitable for fluid-solid coupling numerical simulation of the actual parachute drop process. This method makes full use of the free transformation characteristics of the ALE grid to adaptively track the local flow field around the parachute in motion , so as to overcome the limitations of the spatially fixed flow field grid on the parachute airdrop movement range in the existing numerical simulation methods, and effectively reduce the amount of calculation, and realize fast and high-precision fluid-solid coupling numerical simulation of the parachute airdrop large-scale motion process simulation.

Description

Technical field [0001] The invention relates to the field of flow field grid control of fluid-structure coupling numerical simulation, in particular to an adaptive grid control method suitable for fluid-structure coupling numerical simulation. Background technique [0002] Because of its light weight, small size, and high cost-effectiveness, parachutes are widely used in personnel airborne, equipment airdrop, aircraft recovery, and bomb stabilization. In order to reduce the test samples in the parachute system modification and design process and shorten the design cycle, numerical simulation is often needed. However, the parachute opening and inflation process is an unsteady flow field-structure coupling process involving large deformation of flexible fabrics, and its inherent complex aerodynamic characteristics bring great difficulties to numerical simulation. [0003] At present, the existing numerical simulations for the parachute flow field are based on the assumption that the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 宁雷鸣张红英杨璐瑜陆伟伟李旭东童明波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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