Digital ship model planar motion mechanism experimental method based on CFD software

Abstract

The invention provides a digital ship model plane motion organization experimental method based on computation fluid dynamics CFD software FLUENT. The method includes applying a FLUENT pre-process software GAMBIT to establish a research object model and a control domain; arranging a triangle grid on the model surface, then arranging a unstructured grid in the control domain; setting the boundary condition, joining an user-defined function UDF document, introducing dynamic grid technology, using a finite volume method based on the complete unstructured grid, realizing a pure swaying movement, a pure rising and falling movement, a pure oscillatory movement, a pure pitching movement and a pure rolling movement carried on by a plane motion organization experiment; applying a science computation software MATLAB to do Fourier expansion of a force and a moment coefficient obtained by the FLUENT, being fitted by EXCEL least squares method, obtaining a hydrodynamic force coefficient of a vertical plane and a horizontal plane as well as the related hydrodynamics analysis by dimensionless. The invention carries on the digit plane motion organization experiment using the CFD software, can satisfy the request of hydrodynamic force data in the design initial period of a submersible.

Description

(1) Technical field [0001] The invention relates to an experimental method for the hydrodynamic performance of an underwater robot. (2) Background technology [0002] At present, after the preliminary design of the underwater robot is completed, the hydrodynamic performance research must be carried out. It is a traditional and practical method to carry out the planar motion mechanism experiment in the circulating water tank. At the same time, there are also some shortcomings: in the design process, the rationality of selecting the boat type is checked through experiments. If the model needs to be changed many times, the manufactured model will no longer be applicable. If it is changed again, the time period for modification or construction will change. It is long and the cost increases; the manufactured model has no other functions after the experiment is completed, which is not conducive to environmental protection; the experiment is greatly affected by physical conditions ...

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Problems solved by technology

At the same time, there are also some shortcomings: in the design process, the rationality of selecting the boat type is checked through experiments. If the model needs to be changed many times, the manufactured model will no longer be applicable. If it is changed again, the time period for modification or construction will change. Long time and increased cost; the manufactured model has no other effect after the experiment is completed, which is not conducive to environmental protection; the process of experiment is greatly affected by physical conditions and human factors

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