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CFD calculation method for forecasting ship resistance

A calculation method and resistance technology, which is applied in the field of CFD calculation, can solve problems such as large amount of calculation and less attention to turbulent fluctuations, etc., and achieve the effects of good numerical stability, less calculation time, and saving calculation resources

Inactive Publication Date: 2016-01-13
SHANGHAI LINGYAO SHIP ENG CO LTD
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Problems solved by technology

[0004] Aiming at the technical problems existing in the existing prior art, the purpose of the present invention is to provide a CFD calculation method for predicting ship resistance. Compared with the other two methods, it does not pay much attention to the turbulent fluctuations, but uses a certain model It is reflected in the time-averaged equation, thus avoiding the problem of large amount of calculation

Method used

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0017] This embodiment is a CFD calculation method for forecasting ship resistance, comprising the following steps:

[0018] S1: Two-phase incompressible RANS is used as the governing equation, including continuity equation and momentum equation;

[0019] S2: Use the single-phase levelset method to process the free surface;

[0020] S3: Use the finite volume method to discretize the calculation domain into a series of small units, and the calculation flow field information is stored in the center...

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Abstract

The invention provides a CFD calculation method for forecasting ship resistance. The method comprises: S1: adopting a two-phase incompressible RANS as a control equation, wherein the control equation comprises a continuity equation and a momentum equation; S2: processing a free surface by using a single-phase level set method; S3: discretizing a computational domain into a series of small units by using a finite volume method, calculating flow field information, and storing the information in a grid unit gravity; S4: obtaining a value of a unit surface according to an interpolation value of the unit gravity; S5: obtaining a volume integral of a unit body by summing the value of the unit surface; and S6: performing iterative solution on a pressure and velocity coupling equation obtained after discretization by adopting a PISO implicit separation algorithm, and finally obtaining a convergent numerical solution, wherein the calculation of each time step comprises momentum estimation, pressure solution and velocity correction. The calculation method is relatively small in amount of calculation and high in accuracy.

Description

technical field [0001] The invention relates to the technical field of ships, in particular to a CFD calculation method for predicting ship resistance. Background technique [0002] The prediction of resistance performance and the simulation of wave-making conditions for ships sailing in still water have always been a hot research topic in ship shape optimization and design. It is of great significance to improve the accuracy of resistance calculation and to study the internal law of resistance change. The existing research methods include model test, theoretical calculation of potential flow and computational fluid dynamics (CFD) method. [0003] With the improvement of computer computing speed, it is possible to calculate the navigation resistance of ships with highly nonlinear motion characteristics by CFD method. In the CFD calculation method, the methods for numerical simulation of the viscous flow field around the free surface of the hull mainly include direct numeri...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F17/13
Inventor 孙攀李光谢继荣李伟杰陈登
Owner SHANGHAI LINGYAO SHIP ENG CO LTD
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