Direct calculation method for stall coefficient of ship in stormy wave
A ship, wind and wave technology, applied in the field of direct calculation of ship stall coefficient in wind and waves, can solve the problem of not considering the real viscous efficiency, etc., to achieve the effect of improving efficiency
Active Publication Date: 2021-10-01
DALIAN MARITIME UNIVERSITY
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[0005] The present invention provides a direct calculation method for ship stall coefficient in wind and waves, which solves the problem that the existing ship stall coefficient calculation method does not consider real viscous efficiency
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[0033] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0034]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinar...
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The invention provides a direct calculation method for a stall coefficient of a ship in stormy waves. The direct calculation method comprises the following steps: S1, establishing a physical model; S2, establishing a CFD numerical simulation calculation domain, importing a bare hull model and physical models of a propeller and a rudder established in the S1 into CFD numerical simulation software, and establishing the CFD numerical simulation calculation domain; S3, setting a numerical model, defining boundary conditions of the CFD numerical simulation computational domain in the S2, determining fluctuating wind speed change rules, determining random wave parameters and component waves, and setting a CFD numerical solution model; and S4, carrying out numerical calculation, flow field initialization and setting, according to the CFD numerical simulation calculation domain established in the S2 and the numerical model set in the S3, obtaining a ship speed change curve in random stormy waves, obtaining the average value of speed reduction, and calculating the stall coefficient in the ship stormy waves.
Description
technical field [0001] The invention relates to the field of hydrodynamic seakeeping of ships, in particular to a method for directly calculating the stall coefficient of ships in wind and waves. Background technique [0002] Traditional ship design mainly focuses on the resistance and propulsion performance of the ship in still water conditions. However, when a ship sails in waves, the resistance brought by the waves to the ship will increase, which will directly lead to the loss of ship speed, cause the ship to stall, affect the propulsion performance of the ship, and cause the loss of ship operating performance and economic benefits. Ship stall is a key parameter that directly affects the ship energy efficiency design index. Ship designers usually set the stall coefficient f in the initial design stage w is assumed to be a constant value of 1.0, however f w The actual value of directly affects the calculation of EEDI, which affects the f w The evaluation method puts fo...
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IPC IPC(8): G06F30/15G06F30/23G06F30/28G06F113/08G06F119/14
CPCG06F30/15G06F30/28G06F30/23G06F2113/08G06F2119/14Y02T90/00Y02T70/10
Inventor 张雷张佳宁郭志扬曹燕京
Owner DALIAN MARITIME UNIVERSITY