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Self-adaptive mesh control method applicable to fluid-solid coupling numerical simulation in paradrop process

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

Inactive Publication Date: 2015-04-08
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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  • Self-adaptive mesh control method applicable to fluid-solid coupling numerical simulation in paradrop process
  • Self-adaptive mesh control method applicable to fluid-solid coupling numerical simulation in paradrop process

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[0013] Such as figure 1 As shown, the single-parachute object-dropping system generally has a large initial horizontal velocity, so it experiences large attitude and position changes during the entire airdrop parachute opening process (a)-(c). By assigning the velocity vector of the parachute intersection point to the flow field grid, the flow field grid can track the entire range of motion of the parachute system; It is used to determine the spatial attitude of the flow field grid, which can ensure that the central axis of the flow field is approximately consistent with the axis of the parachute system at each stage in the process of (a)-(c); at the same time, in (a)-(c ) process, the radial size of the flow field grid is automatically scaled according to the projected area of ​​the canopy, which makes the flow field grid always have a relatively appropriate size to capture the surrounding area of ​​the canopy during the entire large deformation process of the parachute infla...

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Abstract

The invention discloses a self-adaptive mesh control method applicable to fluid-solid coupling numerical simulation in a paradrop process. Self-adaptive tracking of a local flow field around a parachute in movement is carried out by means of free transformation of ALE (arbitrary Lagrangian Eulerian) meshes, and consequently the defect of limits on paradrop motion range by spatially-fixed flow field meshes in existing numerical simulation method can be overcome, calculation amount is effectively decreased, and quickness and high precision in fluid-solid coupling numerical simulation of the large-range paradrop motion process are realized.

Description

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

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Application Information

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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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