Design And Hydrodynamic Analysis For Anti-rolling Appendage Of Cargo Transfer Vessel

With the increasing shortage of land and oil resources,the development needs of deep sea oil and gas resources are gradually expanding.In the relevant offshore operations,you can use the crude oil transfer barge(CTV)to implement the FPSO crude oil transfer outside the transfer,that is,using CTV traction super-large tanker(VLCC)in the FPSO near the implementation of collision avoidance of motor positioning and crude oil outside the pipeline.In the use of waves,CTV in the mobile positioning and transfer operations will produce the corresponding swing movement,especially the rolling movement is more prominent,which will affect the CTV operation stability and security,it is necessary to take a certain reduction Shake measures,such as the installation of anti-shake with the body,in order to achieve stable operation of the CTV platform,and thus improve operational efficiency and safety.In order to obtain the effective and engineering design scheme,this paper studies the program design of CTV by using CTV on the basis of CTV hydrodynamic and motion analysis.Based on the theory of viscous fluid mechanics,CFD technique is used to simulate the turbulence damping of CTV by means of software STAR-CCM +.Then,the numerical calculation and analysis of CTV oscillatory motion in wave are carried out.According to the principle of anti-And the quantitative analysis of the bottom skirt,the concept and the expected design scheme of the bottom skirt are put forward.Through the analysis of the CTV swing damping,the swaying motion and the shaking efficiency after the installation of the bottom skirt,the engineering is applicable and the technology can be implemented of the CTV attenuated body(bottom skirt)design.Firstly,the numerical solution model of the forced rolling motion of the hull is established for the C11 container ship by using the overlapping grid technology.The numerical results are compared with the experimental values.The data fits well and can prove the feasibility of the scheme.Based on this method,the calculation of the roll damping of the crude oil transfer barge is carried out.Secondly,the numerical wave method is studied,and the numerical wave simulation is carried out,using the boundary wave method.The numerical simulation results are compared with the theoretical analysis results,which shows the feasibility of the numerical wave method.The motion response of CTV in the transverse wave is calculated by using this wave method,which is similar to the theoretical results in the literature.Thirdly,with the experience of designing the bilge keel,the size of the bottom skirt is determined.The hydrodynamic analysis and flow field detection of the bottom skirt are carried out.With the increase of the width of the bottom skirt,the damping coefficient increases,and the numerical results are similar to the theoretical results.As the presence of the bottom skirt has an impact on the flow field,the number and size of the vortex produced is larger,and the energy is stronger.Finally,the numerical calculation in the wave of the CTV fitted with bottom skirt is carried out.According to the amplitude-frequency response,the roll amplitude under the working condition was calculated,and the size of the bottom skirt was determined.According to the size of the bottom skirt,the CTV is verified in the actual sea condition with irregular waves and the result is reasonable.