Comments are given on the various physical definitions of the force constant of propellant. As there are more or less defects in these definitions, two new definitions are presented to reflect the physical essence of ...Comments are given on the various physical definitions of the force constant of propellant. As there are more or less defects in these definitions, two new definitions are presented to reflect the physical essence of propellant force more perfectly and could well compatible with the mathematical expression.展开更多
This paper is devoted to the assessment of ship maneuvering simulation using different propeller models with the focus on a simplified propeller model that represents the action of the propeller by body force and uses...This paper is devoted to the assessment of ship maneuvering simulation using different propeller models with the focus on a simplified propeller model that represents the action of the propeller by body force and uses propeller performance curve to determine propeller loading during ship maneuvering.Simulations are also performed with an actual propeller approach with which the propeller rotation is simulated directly with the Reynolds averaged Navier-Stokes equation(RANSE)solver.Both time accurate simulations using sliding grid and rotating frame approximations have been performed for comparison.The zigzag and turning circle maneuvers in calm water have been simulated for two different ship models,namely the ONR tumblehome(ONRT)test case and the KRISO(Korea Research Institute of Ship and Ocean)Container Ship(KCS)test case.Predicted ship motion is compared with measurement data to assess the accuracy of the numerical prediction using RANSE computations with different propeller models.展开更多
On the occasion of the 60th anniversary of the Shanghai People’s Association for Friendship with Foreign Countries,Li Xiaolin,president of the Chinese People’s Association for Friendship with Foreign Countries,revie...On the occasion of the 60th anniversary of the Shanghai People’s Association for Friendship with Foreign Countries,Li Xiaolin,president of the Chinese People’s Association for Friendship with Foreign Countries,reviewed the course of people-to-people diplomacy since the founding of the People’s Republic of China,especially its important展开更多
文摘Comments are given on the various physical definitions of the force constant of propellant. As there are more or less defects in these definitions, two new definitions are presented to reflect the physical essence of propellant force more perfectly and could well compatible with the mathematical expression.
基金This work was made possible thanks to granted access to the HPC resources of CINES and IDRIS computing centers under the allocation A0072A01308 made by Grand Equipement National de Calcul Intensif(GENCI).
文摘This paper is devoted to the assessment of ship maneuvering simulation using different propeller models with the focus on a simplified propeller model that represents the action of the propeller by body force and uses propeller performance curve to determine propeller loading during ship maneuvering.Simulations are also performed with an actual propeller approach with which the propeller rotation is simulated directly with the Reynolds averaged Navier-Stokes equation(RANSE)solver.Both time accurate simulations using sliding grid and rotating frame approximations have been performed for comparison.The zigzag and turning circle maneuvers in calm water have been simulated for two different ship models,namely the ONR tumblehome(ONRT)test case and the KRISO(Korea Research Institute of Ship and Ocean)Container Ship(KCS)test case.Predicted ship motion is compared with measurement data to assess the accuracy of the numerical prediction using RANSE computations with different propeller models.
文摘On the occasion of the 60th anniversary of the Shanghai People’s Association for Friendship with Foreign Countries,Li Xiaolin,president of the Chinese People’s Association for Friendship with Foreign Countries,reviewed the course of people-to-people diplomacy since the founding of the People’s Republic of China,especially its important
