Ship turning motion simulation method

Abstract

The invention belongs to the technical field of ship motion measurement, in particular to a ship turning motion simulation method. The method does not model a propeller, but simulates propeller thrustwith virtual paddle volume force, and simulates ship or submarine rotating motion in water with integral dynamic mesh, so that the simulation precision is improved and the modeling difficulty is simplified, and accordingly designers and testers can quickly and accurately predict the hydrodynamic performance of the ship 's gyration.

Description

technical field [0001] The invention belongs to the technical field of ship motion measurement, in particular to a ship turning motion simulation method. Background technique [0002] Ship slewing performance is one of the important ship maneuverability indicators. Ships with good slewing performance are easy to steer and maneuver when navigating at sea, which is convenient to bypass other ships or obstacles, and avoid collision accidents, which is of great significance to the safe navigation of ships. Prediction of slewing performance is an important step in the design process of a ship or submarine. The traditional slewing performance prediction method is to carry out slewing experiments of real ships or ship models, but such experiments are time-consuming and laborious, prolonging the ship design cycle and increasing the cost of ship design. With the development of computer performance, computational fluid dynamics (CFD) method is often used in the calculation of ship h...

AI Technical Summary

Problems solved by technology

However, the momentum source term is added to the average Reynolds equation system (RANS), which makes the calculation and solution more complicated; and in the process of numerical simulation, the submarine has no thrust and is only washed by the incoming current, so the submarine can only be roughly analyzed It is difficult to accurately simulate the rotary motion of the submarine under the action of propeller thrust and rudder force

The traditional overlapping grid technology can simulate ship movement by setting overlapping grids and interfaces around the hull. The overlapping grids exchange information with the background domain during movement, but this method needs to set the space required for ship movement as the background domain and divide the grid, for the rotary motion, the required background domain is too large, the number of grids is too large, it is unrealistic to simulate a large rotary ship or submarine

To simulate propeller thrust, the existing method is to build a 3D model of the propeller and draw overlapping grids, but the workload is heavy, the number of grids is too large, the calculation time is too long, and the computing power is too high

It is not conducive to shortening the ship design cycle and reducing the design cost

Apply the method of virtual paddle disk body force to simulate the thrust of the ship, fix the forward and backward movement of the hull, and determine the flow velocity that matches the current thrust by changing the incoming flow velocity of the water, which is the current velocity of the hull. This method requires multiple times The current speed can only be determined by calculation, and the unsteady motion of the hull cannot be truly simulated

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