A Calculation Method for Multiple Fluid-Structure Interactions of Stern Bearing-Rotor System

Abstract

A multiple fluid-solid coupling calculation method for a stern bearing-rotor system, belonging to the technical field of fluid-solid coupling for offshore platforms, including multiple stern bearings, a propeller shaft, including unit time step settings and total calculation time settings, fluid domain unit discrete discretization, discretization of solid domain units, calculation of discretized fluid domain, calculation of discretized solid domain, data coupling calculation, and calculation end steps; the multi-fluid-solid coupling calculation method of the tail bearing-rotor system realizes the work The accurate simulation of the process solves the problem that the existing dynamic grid technology is applied to the space area occupied by multiple tail bearings, and the grid distortion in the numerical simulation is too large, which leads to the low calculation accuracy of the fluid domain; the fluid domain is realized. ‑Solid multi-coupling calculation overcomes the shortcomings of symmetrical bearing-rotor system coupling calculation, and can accurately simulate the multiple coupling effects between propeller shaft and multiple tail bearings between vibration and lubrication.

Description

technical field [0001] A calculation method for multiple fluid-solid coupling of a stern bearing-rotor system belongs to the technical field of fluid-solid coupling of offshore platforms. Background technique [0002] As the focus of oil research and exploration work gradually shifts from land and shallow seas to deep seas, the application of offshore platforms continues to expand. Offshore platforms are divided into fixed type, movable type and semi-fixed type according to structural characteristics and working status. The propeller is one of the key components of the ocean floating platform. The ocean floating platform relies on its own buoyancy to support its platform weight, and uses the propeller to dynamically position the platform. The propeller shaft is the tail shaft of a large ship system with a complex shaft system. The tail bearing at the tail supports the operation, and the reaction force generated by its operation resists the forces of wind, waves, currents, e...

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Problems solved by technology

Therefore, it is of great significance to study the fluid-solid coupling calculation method of the stern bearing-rotor system under an asymmetric flow field for the long-term safety work of offshore platforms; The production of foreign products is not strong in independent design, and the simulation foundation of multi-field coupling work process is weak and there are various problems, which cannot provide technical support for my country's in-depth development of navigation and positioning power systems for deep-sea drilling floating platforms with independent property rights

[0003] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: 1. The numerical simulation of the working process of the tail bearing and the propeller shaft system is not accurate; 2. The fluid in the fluid-solid coupling process of the tail bearing-rotor system 3. The fluid-solid coupling process of the tail bearing-rotor system cannot accurately reveal the coupling mechanism between the propeller shaft and multiple tail bearings between vibration and lubrication

[0005] 1. The existing fluid-solid coupling technology uses large-scale CAE software to perform unified calculation and processing of the discretized data in the fluid domain and solid domain, resulting in inaccurate numerical simulation of the working process of the tail bearing and propeller shaft system;

[0006] 2. Existing fluid domain calculations using dynamic grid technology for stern bearing numerical simulation have the problem of excessive grid distortion;

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