Ship longitudinal navigation state and resistance forecasting method based on overlapped grids

Abstract

The invention discloses a ship longitudinal navigation state and resistance forecasting method based on overlapped grids. The ship longitudinal navigation state and resistance forecasting method comprises the steps that numerical calculation is conducted on resistance of a free model and a constraint model at different navigation speeds; comparing the calculation results of the free model and theconstraint model, and analyzing the influence of the navigation attitude on the ship resistance performance; adopting a free model to analyze the ship sinkage amount and the longitudinal inclination value at different navigational speeds, and simulating navigation attitudes of the ship at different navigational speeds through the overlapped grids; and forecasting the resistance by analyzing navigation attitudes of the ship at different navigational speeds. According to the method, the RANS method is combined with the overlapped grid technology to predict and research the longitudinal navigation state and resistance of the ship, the influence of the ship navigation attitude on the resistance performance of a large ship is analyzed, the navigation state and resistance of the ship are predicted by adopting a free model considering ship navigation state trim and heave, and the resistance prediction result is more accurate.

Description

technical field [0001] The invention relates to the technical field of ships, in particular to a method for forecasting the longitudinal navigation state and resistance of ships based on overlapping grids. Background technique [0002] The resistance encountered by ships navigating at sea is mainly air resistance and water resistance. At present, the main methods of resistance prediction include theoretical research method, test method and numerical simulation method. Theoretical research methods are mainly used in the early stage of hull design, and the main theoretical research methods include map method, regression formula method and empirical formula estimation method. The test method is the main means of resistance prediction, mainly ship model test method and real ship test method. The prediction results are accurate and reliable, and the practicability is strong, but its economy is poor and it cannot completely simulate the complex actual sea conditions. With the wid...

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Problems solved by technology

[0005] The purpose of the present invention is to aim at the defective of prior art, provide a kind of ship longitudinal navigation state and resistance prediction method based on overlapping grid, can solve the numerical simulation method under the fixed state to relatively large ship at high Froude number (F n ) inaccurate prediction of resistance within the range

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