Numerical wave generation method for coupling POM and OpenFOAM

Abstract

The invention provides a numerical wave generation method for coupling POM and OpenFOAM. The method includes: simulating a coarse resolution wave model of a target area by utilizing POM; obtaining a function relational expression of the fluid speed on each grid point along with the height change through a polynomial fitting mode; after conversion, writing the function relational expression into aninitial file of the OpenFOAM; driving the OpenFOAM to perform side boundary fitting calculation according to the input data; and during calculation, enabling the POM to continuously update data of the target area according to the time change and output a corresponding function relational expression, enabling the OpenFOAM to perform recalculation once along with each update of the POM, and generating pool waves similar to the real marine environment within the specified cycle time. According to the invention, coupling calculation of POM and OpenFOAM is carried out; the coupling of a large-scale ocean mode and a small-scale computational fluid dynamics CFD mode OpenFOAM is achieved, downscaling is carried out to obtain finer resolution data, the accuracy of a virtual test under a ship numerical pool is improved, and the precision of ship hydrodynamic performance evaluation and prediction is improved.

Description

technical field [0001] The invention belongs to the field of hydrodynamics, and in particular relates to a numerical wave-making method coupling POM and OpenFOAM. Background technique [0002] Excellent hydrodynamic performance can significantly improve the economy of ships, and the design, evaluation and optimization of ship hydrodynamic performance are inseparable from ship model tests. Traditional physical tank experiments usually require the design of a series of ship models, which are costly and long-term; due to the existence of scale effects, it is difficult for the ship model test data to completely match the flow conditions of the real ship; in addition, due to the limitations of the measurement technology itself, it is difficult to measure accurately The complex flow field near the ship model, and the arrangement of test equipment will also interfere with the flow field of the ship model. [0003] With the rapid development of Computational Fluid Dynamics (CFD), t...

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Problems solved by technology

[0004] However, when the CFD method is used for simulation, the ship numerical tank technology mostly uses the rocking plate, pushing plate wave-making method or momentum source wave-making method. Although these wave-making methods can generate corresponding waves, these wave-making methods are mostly used to simulate ideal waves. The regular waves or waves with a fixed wave spectrum are quite different from the undulating actual waves in the real ocean environment, and the actual hydrodynamic performance of the ship is also different with different waves. Therefore, the current wave breaking method reduces the CFD Simulation Accuracy

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