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Calculation method for predicting ship resistance based on CFD

A calculation method and resistance technology, which is applied in the calculation field of forecasting ship resistance, and can solve problems such as large amount of calculation and less attention to turbulent fluctuations

Inactive Publication Date: 2016-09-21
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 calculation method based on CFD to predict ship resistance. Compared with the other two methods, it does not pay much attention to the pulsation of turbulent flow. This model is reflected in the time-averaged equation, thus avoiding the problem of large amount of calculation

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  • Calculation method for predicting ship resistance based on CFD
  • Calculation method for predicting ship resistance based on CFD
  • Calculation method for predicting ship resistance based on CFD

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Embodiment Construction

[0072] 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.

[0073] figure 1 Shown is the numerical calculation flow chart of the entire calculation field within one time step of the calculation method of the present invention.

[0074] figure 2 , image 3 As shown, the calculation method of the present invention is applied to an embodiment of calculating the total resistance coefficient of the DTMB5415 ship model under different Froude numbers (Fr).

[0075] The main parameters of the DTMB ship model are shown in Table 1:

[0076] Table 1 Main paramet...

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Abstract

The invention provides a calculation method for predicting the ship resistance based on CFD, and the method comprises the steps: S1, employing a two-phase incompressible RANS as a control equation, which comprises a continuity equation and a momentum equation; S2, processing a free surface through employing a single-phase level set method; S3, enabling a computational domain to be discretized into a series of small units through employing a finite volume method, calculating flow field information, and storing the flow field information at the gravity center of a grid unit; S4, obtaining values of unit surfaces according to the interpolation of the gravity center of the units; S5, solving the sum of the values of the unit surfaces, and obtaining the volume integral of a unit body; S6, carrying out the iterative solving of a pressure speed coupling equation, obtained after discretization, through employing a PISO implicit separation algorithm, wherein the calculation of each time step comprises momentum estimation, pressure solving and speed correction; and finally obtaining a convergent numerical solution. The method employs CFD to calculate and obtain a total resistance coefficient of a ship at a certain operating speed, and calculates and obtains the total resistance of the ship through a simple formula. The method is high in efficiency, is accurate, and is very strong in engineering practicality.

Description

technical field [0001] The invention relates to the technical field of ships, in particular to a 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 numerical ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/13
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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