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Numerical Study on Bank Effects for a Ship Sailing in Shallow Channel 被引量:2
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作者 姚建喜 邹早建 王化明 《Journal of Shanghai Jiaotong university(Science)》 EI 2011年第1期91-96,共6页
A numerical study on bank effects in shallow channels is carried out by using a first-order Rankine source panel method.A container ship sailing along a vertical bank and a sloping bank at different forward speeds,dif... A numerical study on bank effects in shallow channels is carried out by using a first-order Rankine source panel method.A container ship sailing along a vertical bank and a sloping bank at different forward speeds,different water depths and different distances between the bank and the ship hull is taken as example.The sway force and yaw moment acting on the hull are calculated and the influences of the speed,water depth and distance between the bank and ship hull on the hydrodynamic force and moment are analyzed.This study can provide insight into the bank effects,as well as to give guidance on ship manoeuvring and control in restricted waterways,which is helpful to the navigation safety. 展开更多
关键词 bank effects shallow water hydrodynamic forces panel method
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Hydrodynamic interaction among hull,rudder and bank for a ship sailing along a bank in restricted waters 被引量:7
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作者 麻绍钧 周明贵 邹早建 《Journal of Hydrodynamics》 SCIE EI CSCD 2013年第6期809-817,共9页
By applying a CFD tool to solve the RANS equations, the viscous flow around a model of hull-rudder system towed along a bank in shallow water is numerically simulated. Hydrodynamic forces and moments acting on the shi... By applying a CFD tool to solve the RANS equations, the viscous flow around a model of hull-rudder system towed along a bank in shallow water is numerically simulated. Hydrodynamic forces and moments acting on the ship are calculated for different ship-bank distances and rudder angles. A container ship, KCS, is taken as an example for the numerical study. Under the assumption of low ship speed, the influences of free surface elevation and ship squat are assumed to be negligible. Based on the calculation results, the hydrodynamic interaction among the hull, rudder and bank is analyzed. 展开更多
关键词 hydrodynamic interaction hull-rudder system bank effect CFD
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Numerical estimation of bank-propeller-hull interaction effect on ship manoeu-vring using CFD method 被引量:7
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作者 S.Kaidi H.Smaoui P.Sergent 《Journal of Hydrodynamics》 SCIE EI CSCD 2017年第1期154-167,共14页
This paper presents a numerical investigation of ship manoeuvring under the combined effect of bank and propeller. The incompressible turbulent flow with free surface around the self-propelled hull form is simulated u... This paper presents a numerical investigation of ship manoeuvring under the combined effect of bank and propeller. The incompressible turbulent flow with free surface around the self-propelled hull form is simulated using a commercial CFD software (ANSYS-FLUENT). In order to estimate the influence of the bank-propeller effect on the hydrodynamic forces acting on the ship, volume forces representing the propeller are added to Navier-Stokes equations. The numerical simulations are carried out using the equivalent of experiment conditions. The validation of the CFD model is performed by comparing the numerical results to the availa- ble experimental data. For this investigation, the impact of Ship-Bank distance and ship speed on the bank effect are tested with and without propeller. An additional parameter concerning the advance ratio of the propeller is also tested. 展开更多
关键词 Viscous fluid flow simulation (CFD) bank effect bank-propeller-hull interaction hydrodynamic forces estimations advance ratio
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Boundary layer influence on ship model tests in extremely shallow and confined water
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作者 Evert Lataire Asif Raza +1 位作者 Marc Vantorre Guillaume Delefortrie 《Journal of Hydrodynamics》 SCIE EI CSCD 2023年第2期365-378,共14页
Ships sailing in shallow and/or confined water(when calling a harbour or other berthing areas),will experience a different behaviour due to the interaction with vertical and/or horizontal boundaries.Among other hydrod... Ships sailing in shallow and/or confined water(when calling a harbour or other berthing areas),will experience a different behaviour due to the interaction with vertical and/or horizontal boundaries.Among other hydrodynamic changes induced in confined water,the lateral ship-bank interaction force changes its sign at a critical distance between ship and bank or bottom.However,this distance and its effects on model test results have not been quantified in the past.To investigate the shallow water hydrodynamics coupled with bank effects,systematic model tests were carried out at Flanders Hydraulics Research(FHR)with different ship models.The following parameters were systematically varied:water depth,lateral position,speed,and propeller rate.The change of the ship-bank induced lateral force from an attraction force in medium-deep and shallow water to a repulsion force in extremely shallow water conditions,can be ascribed to the interaction of the boundary layers of the ship model and the environment(tank and installed banks).In this article,a mathematical model is proposed for the critical distance in terms of boundary layer influence thickness.This indicates the range where the model tests are influenced by the horizontal or vertical restrictions combined with the propeller’s dynamic effects.Moreover,the expression has also been extended to describe the relationship between full-scale ship length and water depth with the boundary layer influence thickness.Due to lower Reynolds numbers and relatively thicker boundary layers at model scale,upscaling of the model test results,according to Froude’s law,may provide erroneous results.The influence of the boundary layer initiates at a relatively higher under keel clearance(UKC)for a smaller ship model compared with a larger ship model.Therefore,the boundary layer’s influence with respect to ship model length should be considered during model testing. 展开更多
关键词 Shallow water hydrodynamics bank effects boundary layer model tests mathematical model
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Modified fast Fourier transform in FBMC for satellite communications 被引量:1
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作者 Chaosan YANG Rongke LIU Ruifeng DUAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2017年第4期1519-1527,共9页
In this paper,a Doppler scaling fast Fourier transform(Doppler-FFT)algorithm for filter bank multi-carrier(FBMC)is proposed,which can efficiently eliminate the impact of the Doppler scaling in satellite communicat... In this paper,a Doppler scaling fast Fourier transform(Doppler-FFT)algorithm for filter bank multi-carrier(FBMC)is proposed,which can efficiently eliminate the impact of the Doppler scaling in satellite communications.By introducing a Doppler scaling factor into the butterfly structure of the fast Fourier transform(FFT)algorithm,the proposed algorithm eliminates the differences between the Doppler shifts of the received subcarriers,and maintains the same order of computational complexity compared to that of the traditional FFT.In the process of using the new method,the Doppler scaling should be estimated by calculating the orbital data in advance.Thus,the inter-symbol interference(ISI)and the inter-carrier interference(ICI)can be completely eliminated,and the signal to interference and noise ratio(SINR)will not be affected.Simulation results also show that the proposed algorithm can achieve a 0.4 d B performance gain compared to the frequency domain equalization(FDE)algorithm in satellite communications. 展开更多
关键词 Doppler effect Fast Fourier transforms Filter bank multi-carrier Inter-carrier interference Inter-symbol interference Signal to interference and noise ratio
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