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Boundary layer grid solving method of underwater glider lift-drag ratio at different attack angles

A technology of underwater glider and boundary layer grid, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of poor glide efficiency and accuracy of underwater glider, and achieve saving calculation cycles, saving manpower and material resources, The effect of improved computational efficiency

Inactive Publication Date: 2017-06-23
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The present invention aims to solve the current situation that the accuracy of the existing calculation method for solving the glide efficiency problem of the underwater glider is relatively poor, and therefore provides a boundary layer grid solution method for the lift-to-drag ratio of the underwater glider at different angles of attack

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  • Boundary layer grid solving method of underwater glider lift-drag ratio at different attack angles
  • Boundary layer grid solving method of underwater glider lift-drag ratio at different attack angles
  • Boundary layer grid solving method of underwater glider lift-drag ratio at different attack angles

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Embodiment Construction

[0019] A boundary layer grid solution method for the lift-to-drag ratio of an underwater glider at different angles of attack is implemented in the following steps:

[0020] The present invention uses computer simulation as the main research method, which is mainly divided into numerical modeling and CFD simulation, wherein CFD simulation is divided into grid division (pre-processing), calculation and solution, and result analysis (post-processing);

[0021] Step A, simplification of the underwater glider model:

[0022] First of all, the model should be simplified in ICEM. The simplification of the model can not only improve the grid quality and calculation accuracy, but also greatly reduce the calculation time, which is an indispensable link in the simulation analysis. The rudder was repaired, the hook before the release was removed, and the communication system was removed.

[0023] Step B. Create the fluid outer domain of the underwater glider as follows:

[0024] Becaus...

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Abstract

The invention provides a boundary layer grid solving method of the underwater glider lift-drag ratio at different attack angles. The method aims at determining the optimal sliding angle of an underwater glider, obtaining resistance and lifting force at different attack angles and providing theory support for later selection of a control system and a power source of the underwater glider. Finally, the accuracy of boundary layer grid numerical simulation is verified through an experiment, and the obtained matching condition is good. The analysis method can be popularized to other series of underwater motion machines, and compared with traditional complex formula derivation, the calculation period is saved, calculating efficiency can be improved by two times or above, and the efficiency and other problems of the underwater machines can be predicted and solved more effectively. The method comprises the steps that A, an underwater glider physical model is simplified; b, an underwater glider fluid outer area model is created; C, an underwater glider bonding layer grid model is created; D, numerical solution calculation of the underwater glider lift-drag ratio at different attack angles is carried out; E, data result postprocessing is carried out. The method is used for effective solving of the underwater glider lift-drag ratio.

Description

technical field [0001] The invention belongs to the technical field of target characteristics and identification, and relates to a boundary layer grid solution method for the lift-to-drag ratio of an underwater glider under different attack angles. Background technique [0002] The underwater glider is a new type of underwater robot without cables. Its power source is the net buoyancy of seawater. Relying on the net buoyancy, the underwater glider can slide slowly along a zigzag track in seawater. Because it has no thrust system, it has the characteristics of low noise, long battery life, and long gliding distance. And various sensors can be installed on it as an auxiliary, and the underwater glider plays a vital role in the collection of marine big data, military investigation, marine environment and resource monitoring, etc. In recent years, the numerical simulation of underwater gliders is mainly the calculation of the lift-to-drag ratio. Greater lift, smaller drag and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367Y02T90/00
Inventor 张艳芹权振刘国良孔祥滨于晓东程海阔郭丽丽
Owner HARBIN UNIV OF SCI & TECH
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