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Viscous potential flow theoretical analysis method

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: 2021-01-05
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 K of the incident wave = ω 2 / g; g is the acceleration d...

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Abstract

The invention provides a viscous potential flow theoretical analysis method, which belongs to the technical field of hydrodynamic analysis. According to the theoretical analysis method, a nonlinear pressure loss condition is introduced into the narrow slit inlet boundary of the ocean structure, the whole fluid domain is divided into a plurality of areas in the analysis and solving process, and a multipole expansion method is used for obtaining a speed potential series expression of an external open fluid area; and finally, the boundary is dispersed, and the speed potential of each unit on allthe boundaries and the normal guide number of the speed potential are solved in combination with the nonlinear pressure loss condition of the narrow slit inlet boundary and the normal speed continuouscondition and the pressure continuous condition on the common boundary of other adjacent regions. And the resonance wave height in the narrow slits between the ocean structures and the wave force borne by the structures are obtained. According to the method, the wave energy dissipation in the narrow slit is effectively considered, the resonance wave height in the narrow slit and the wave force borne by the structure are reasonably calculated, and the calculation efficiency is high.

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...

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Application Information

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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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