Numerical Simulation Of Flow Around Panamax Bulk Carrier Based On Fluent

In the process of sailing, flow field around the ship hull submerged will change as sailing speed, draft and different navigation area, and then exert an influence on the ship sailing resistance, deflection, navigation safety, etc. To study the flow field of ship hull submerged, traditional method is to conduct "towing tank experiments", but this method is time-consuming, and affected by the scale effect. As ship CFD (Computational Fluid Dynamics) technology and professional ship modeling software development, through the computer software to numerical simulate the flow around ship hull submerged is realized. This method is high precision, but the early stage of modeling process need higher professional knowledge, so there are some limitations. Using EXCEL, AUTOCAD software, this paper designs a simple modeling method. On the basis of ensure the model accuracy, this method shortens the time of modeling and at the same time makes the non-professional person can model a ship by themselves according to the ship data,Based on the commercial CFD software FLUENT, using the k-ε turbulence model, this paper carried on the modeling and the numerical simulation of the flow around a panamax bulk carrier (BIGWAVE).Specific content as follows:First of all, according to the ship data of BIGWAVE, using software EXCEL, standard 3D point coordinates were generated. In group of "line", we imported standard 3D point coordinates into software AUTOCAD to generate 3D wireframe ship hull. After regional layout, we imported the data into software GAMBIT to generate 3D body model of the ship hull.Secondly, based on software GAMBIT, combined with many experiments and experience, appropriate computational domain were selected. Structured grid was carried on neat part of the ship hull model and the computational domain, and unstructured grid was carried on deformation more complex part. After inspection, all the grid quality reached the standard of software FLUENT to calculate.Finally, import the grid file into software FLUENT, using the k-ε turbulence model and the standard wall function, setting up related boundary and initial conditions, we carried on the numerical simulation of the flow field around the ship hull submerged. As a result, we got the distribution of pressure and flow field of ship hull surface submerged. Combined with the experimental data above, this paper preliminary studied the resistance of ship submerged when the ship sailing steadily, and compared with the results of the theoretical formula calculation. The results show that Using the experimental data obtained from this paper to calculate the water resistance and the theoretical calculation results have a high fitting degree, so as to prove that the simulation calculating results in this paper are accuracy. The experimental data can provide reference for further more study of ship deflection, ship maneuvering and other related problems.