Numerical method for simulating ship propeller wake field

A numerical method, propeller technology, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as inability to further improve, uncertain stability of convergence, etc.

Inactive Publication Date: 2013-02-27
TIANJIN AEROCODE ENG APPL SOFTWAREDEV
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 2. The spatial discrete precision of the added vorticity is limited and cannot be further improved;
[0010] 3. The

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Numerical method for simulating ship propeller wake field
  • Numerical method for simulating ship propeller wake field
  • Numerical method for simulating ship propeller wake field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0069] Further illustrate what the present invention proposes with a specific embodiment below, this numerical simulation technique can be realized with Fortran90 computer high-level programming language, and simulates the flow of the wake field of three-dimensional ship propeller by computer operation.

[0070] In a specific embodiment, the shape and computational domain of the propeller are as image 3 shown. A propeller with four blades is adopted, the diameter of the fear surface is 0.227m, and the chord length at 70% of the radius of the disk surface is 0.086m. The computational domain adopts a rotating coordinate system, and the direction of rotation is shown by the middle arrow. The calculation grid adopts unstructured tetrahedral grid. The spatial discretization of the numerical simulation adopts the Finite Volume Method, and each calculation grid becomes a control unit, and the flow variable is at the center of the control unit.

[0071] The flight condition of the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a numerical method for simulating a ship propeller wake field. The numerical simulation accuracy of a type of flow fields predominant in vortex motion is improved by forces of two different forms in a momentum equation according to the feature of incompressible flows. The forces of two different forms include a spiral force whose vorticity is in a variable gradient direction and a viscous dissipation force whose vorticity is in the variable gradient direction. The method converts an integral calculation of the spiral force in the calculation grid, of which the vorticity is in the variable gradient direction, into a flux calculation of a force on the boundary of the calculation grid, so that the spatial discretization of the force has a format of higher order accuracy. Meanwhile, the source item of the momentum equation maintains the viscous dissipation force whose vorticity is in the variable gradient direction, so as to improve the convergence and stability of numerical solution. The two forces have different amplification coefficients, so that the accuracy of vorticity can be further maintained, and as a result, the vortex motion of the ship propeller wake field is simulated more accurately.

Description

technical field [0001] The invention relates to a numerical method in the application field of computational fluid dynamics (CFD: Computational Fluid Dynamics), in particular to a numerical method for simulating the wake field of a propeller of a ship. Background technique [0002] Among the various propulsion devices of ships, the propeller has become the most important ship propeller in the world because of its relatively simple structure, high propulsion efficiency, and a long history of development and experimental experience. The propeller is composed of multiple blades, and the rotating blades generate thrust in the water, and its principle is similar to that of an aircraft wing to generate lift. However, the wake flow fields of ship propellers and aircraft wings are quite different. The wake flow field of a ship propeller is called wake field, which is a vortex-dominated incompressible flow field full of vortex flow. figure 1 Taking a blade as an example, the flow p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F17/50
Inventor 路明
Owner TIANJIN AEROCODE ENG APPL SOFTWAREDEV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap