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A three-dimensional numerical method for predicting wave drag enhancement of low-speed fat ships in harsh sea conditions

A three-dimensional numerical and hypertrophic technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve complex problems

Active Publication Date: 2019-03-15
HARBIN ENG UNIV
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Problems solved by technology

Because the DB free surface condition is designed to calculate the second derivative of the stack potential, it is more complicated than the NK free surface condition

Method used

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  • A three-dimensional numerical method for predicting wave drag enhancement of low-speed fat ships in harsh sea conditions
  • A three-dimensional numerical method for predicting wave drag enhancement of low-speed fat ships in harsh sea conditions
  • A three-dimensional numerical method for predicting wave drag enhancement of low-speed fat ships in harsh sea conditions

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Embodiment Construction

[0021] The following examples describe the present invention in more detail.

[0022] 1) Read the grid file and automatically extract the waterline information of the ship (including the spatial coordinates of the stagnation point at the head and tail, and the fitting curve function of the waterline). Combining the intelligent parameters of flow field matching boundary and waterline information, the discrete mesh of water surface and matching surface conforming to the boundary element method is automatically generated. And based on the discrete grid of the hull, calculate the hydrostatic parameters of the ship, such as displacement volume, buoyancy center, buoyancy center, moment of inertia, wet surface area, etc. Check the error between the numerical results of the hydrostatic parameters and the physical ship parameters to verify the quality of the ship mesh.

[0023] 2) The present invention uses Taylor expansion boundary elements to solve each velocity potential component ...

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Abstract

The invention provides a three-dimensional numerical method for predicting wave resistance increase of low-speed fat large ships under bad sea conditions. Read the mesh file and carry out the hydrostatic calculation of the ship; Calculating the influence coefficient matrix involved in the boundary integral equation; Velocity Potential of Laminated Modes and Its Spatial First and Second Derivativesand Mj Terms; Green s Function in Time Domain and Its Spatial Derivative Solution; Roll damping coefficient calculation; The Velocity Potential at the Center Point of the Discrete Mesh of the SteppedFree Surface in Time Domain with the Free Surface Condition of Integral Scheme; Direct Time-Domain Disturbance Wave Force Calculation by Taylor Expansion Boundary Element Method; Calculation of Incident Wave Force and Hydrostatic Recovery Force; Modeling, solving equations of motion; Calculation of wave resistance; According to the motion response RAO and drag-increasing RAO, the large amplitudemotion and wave drag-increasing spectrum in irregular waves are analyzed and calculated. The method of the invention can predict the large amplitude motion RAO of a container ship in regular waves, the wave resistance RAO, and the analysis results of the large amplitude motion of the ship and the wave resistance spectrum in irregular waves.

Description

technical field [0001] The invention relates to a numerical simulation method, in particular to a numerical method for simulating wave resistance increase in low-speed fat and large ships in severe sea conditions by using a three-dimensional Taylor expansion boundary element method. Background technique [0002] Ship wave resistance value is to evaluate the ship CO 2 The key indicator of emission level, in the process of new ship design and development, in order to meet the IMO International Maritime Organization's ship CO 2 Emissions index, and the case of excess capacity. Ship designers choose to reduce the design speed, thereby reducing the power of the main engine. In order to meet the ship CO 2 emission index. For oil tankers, bulk carriers and other hypertrophy ships, the reserve power of the main engine is insufficient, which will lead to a decrease in the safety performance of the ship under severe sea conditions. Therefore, the IMO International Maritime Organi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20Y02T90/00
Inventor 陈纪康段文洋
Owner HARBIN ENG UNIV
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