| Hydrodynamic is the most complicated force of the forces load on ships,to ascertain the hydrodynamic accurately is the key issues of sovling high precision ship motion and modeling.With the rapid development of Computational Fluid Dynamics,it is possible to analyze the hydrodynamic of hull from the Angle of the micro flow field.this article will use the NS(Reynolds Average Navier-Stokes,RANS)equation,to do numerical simulation of the two-dimensional flow field and analyzes the change of flow field under different conditions.In this paper,the main work is as follows:(1)Making a numerical calculation for the flow around square column under Two-phase flow.Calculating Re=12000 under the condition of different depth of square column disturbing problem,By comparing numerical results with the experimental situation,data coincide in good condition,and the vortex can be observed clearly.Later,keeping the depth of square column unchanged,analyzing the nature of the flow arrounding square column under the two phase flow by changing the number of Re,which found that with the increasing of Re number,the vortex will fall off fastly.(2)Keeping the Re unchanged,and changed the bilge radius of the ship’s parallel middle body,observeing and analyzing the flow condition arrounding ship bilge.compared with the experimental situation.The results show that within a certain range,with the boat bilge radius increasing,vortex near bilge form the coming flow will gradually increase,however,as the radius of bilge continue to increase,the vortex will gradually decrease.With the increasing of the bilge radius,votex near the outlet of fluid will gradually increase and the flow field will be more complex.(3)Making CFD calculation for the ship type of KVLCC 1:100 scale model by using RANS for Hydrodynamic numerical calculation of Transverse Force.The aricle will compare the CFD results with the calculation results calculate by empirical formula,Then watch the change of the free surface. |
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