Based on the background and development of the pastoral complex,it is believed that the pastoral complex is an inevitable trend of the development of modern agriculture and it is the product of agriculture developing ...Based on the background and development of the pastoral complex,it is believed that the pastoral complex is an inevitable trend of the development of modern agriculture and it is the product of agriculture developing to a higher stage following agricultural industrial park,beautiful countryside,characteristic town,and whole area tourism. Combined with many years of planning and design practice of Wuhan Modern Urban Agriculture Planning and Design Institute,this paper summarized ideas of construction and operation of the pastoral complex,and discussed the construction of pastoral complex planning system,in the hope of providing certain reference for planning of pastoral complex in the whole country in the new period. Finally,through the overview of development history and highlight of urban agriculture in Wuhan,it came up with measures and recommendations for development of pastoral complex in Wuhan City.展开更多
Outflow boundary conditions(OBCs)are investigated for calculation of incompressible flows by spectral element methods.Several OBCs,including essentialtype,natural-type,periodic-type and advection-type,are compared by ...Outflow boundary conditions(OBCs)are investigated for calculation of incompressible flows by spectral element methods.Several OBCs,including essentialtype,natural-type,periodic-type and advection-type,are compared by carrying out a series of numerical experiments.Especially,a simplified form of the so-called Orlanski’s OBCs is proposed in the context of spectral element methods,for which a new treatment technique is used.The purpose of this paper is to find stable low-reflective OBCs,suitable and flexible for use of spectral element methods in simulation of incompressible flows in complex geometries.The computation is firstly carried out for a 2D simulation of Poiseuille-B´enard channel flow with Re=10,Ri=150 and Pr=2/3.This flow serves as a useful example to demonstrate the applicability of the proposed OBCs because it exhibits a feature of vortex shedding propagating through the outflow boundary.Then a 3D flow around an obstacle is computed to show the efficiency in the case of more general geometries.Among the tested OBCs,the advection-type OBCs are proven to have better behavior as compared with the others.展开更多
文摘Based on the background and development of the pastoral complex,it is believed that the pastoral complex is an inevitable trend of the development of modern agriculture and it is the product of agriculture developing to a higher stage following agricultural industrial park,beautiful countryside,characteristic town,and whole area tourism. Combined with many years of planning and design practice of Wuhan Modern Urban Agriculture Planning and Design Institute,this paper summarized ideas of construction and operation of the pastoral complex,and discussed the construction of pastoral complex planning system,in the hope of providing certain reference for planning of pastoral complex in the whole country in the new period. Finally,through the overview of development history and highlight of urban agriculture in Wuhan,it came up with measures and recommendations for development of pastoral complex in Wuhan City.
基金supported by NSF China under Grant 10531080,the 973 High Performance Scientific Computation Research Programthe Program of 985 Innovation Engineering on Information by Xiamen University.
文摘Outflow boundary conditions(OBCs)are investigated for calculation of incompressible flows by spectral element methods.Several OBCs,including essentialtype,natural-type,periodic-type and advection-type,are compared by carrying out a series of numerical experiments.Especially,a simplified form of the so-called Orlanski’s OBCs is proposed in the context of spectral element methods,for which a new treatment technique is used.The purpose of this paper is to find stable low-reflective OBCs,suitable and flexible for use of spectral element methods in simulation of incompressible flows in complex geometries.The computation is firstly carried out for a 2D simulation of Poiseuille-B´enard channel flow with Re=10,Ri=150 and Pr=2/3.This flow serves as a useful example to demonstrate the applicability of the proposed OBCs because it exhibits a feature of vortex shedding propagating through the outflow boundary.Then a 3D flow around an obstacle is computed to show the efficiency in the case of more general geometries.Among the tested OBCs,the advection-type OBCs are proven to have better behavior as compared with the others.
