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A Theoretical Analysis Method of Viscous Potential Flow

A theoretical analysis and viscous technology, applied in the field of viscous potential flow theory analysis, can solve problems such as wave energy dissipation, resonant wave height overestimation, and affecting the safety performance of structures, etc., to reduce the scope of calculation domain and improve calculation efficiency. Effect

Active Publication Date: 2021-06-04
OCEAN UNIV OF CHINA
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Problems solved by technology

The traditional potential flow theoretical model can accurately predict the resonance frequency of the fluid in the narrow gap, but because the wave energy dissipation caused by the actual fluid viscosity cannot be considered, the resonance wave height in the narrow gap between marine structures is often seriously overestimated, affecting Assessment of the Safety Performance of Structures

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0027] For three-dimensional problems, assuming that the fluid is an ideal fluid that is incompressible, inviscid, and rotatable, the velocity potential Φ(x,y,z,t) of the fluid motion satisfies the governing equation:

[0028]

[0029] Considering a linear harmonic with circular frequency ω, the velocity potential can be written as:

[0030] Φ(x,y,z,t)=Re[φ(x,y,z)e -iωt ] (2)

[0031] In the formula, Re means to take the real part of the variable; φ(x,y,z) is space complex velocity potential; t is time;

[0032] The spatial complex velocity potential φ satisfies the following governing equations and boundary conditions:

[0033]

[0034]

[0035]

[0036]

[0037] In the formula, the wave number of incident wave K=ω 2 / g; g is the acceleration due to ...

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Abstract

The invention provides a theoretical analysis method of viscous potential flow, which belongs to the technical field of hydrodynamic analysis. In the theoretical analysis method of the present invention, nonlinear pressure loss conditions are introduced into the inlet boundary of the narrow slit of the marine structure. In the process of analysis and solution, the entire fluid domain is divided into multiple regions, and the multipole expansion method is used to obtain the external open fluid region. Velocity potential series expression; finally, the boundary is discretized, combined with the nonlinear pressure loss conditions at the inlet boundary of the slit and the normal velocity continuity conditions and pressure continuity conditions on the common boundary of other adjacent areas, to solve each element on all boundaries The velocity potential and the normal derivative of the velocity potential can be obtained to obtain the resonant wave height in the narrow gap between the marine structures and the wave force on the structure. The invention effectively considers the wave energy dissipation in the narrow slit, reasonably calculates the resonance wave height in the narrow slit and the wave force received by the structure, and has high calculation efficiency.

Description

technical field [0001] The invention belongs to the technical field of hydrodynamic analysis, and in particular relates to a viscous potential flow theoretical analysis method. Background technique [0002] Under the action of waves, the fluid resonance motion in the narrow gap between multi-body marine structures has an important impact on the safety of structures. The traditional potential flow theoretical model can accurately predict the resonance frequency of the fluid in the narrow gap, but because the wave energy dissipation caused by the actual fluid viscosity cannot be considered, the resonance wave height in the narrow gap between marine structures is often seriously overestimated, affecting Evaluation of the safety performance of structures. Contents of the invention [0003] In view of the deficiencies in the prior art, the present invention provides a viscous potential flow theoretical analysis method, which effectively considers the wave energy dissipation in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/28G06F17/16G06F17/12G06F113/08
CPCG06F17/12G06F17/16G06F30/28G06F2113/08
Inventor 刘勇李爱军刘晓
Owner OCEAN UNIV OF CHINA
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