The microstructure of computer generated nanocrystalline coppers is simulated by using molecular dynamics with Finnis-Sinclair potential,analysed by means of radial distribution functions,coordination number,atomic en...The microstructure of computer generated nanocrystalline coppers is simulated by using molecular dynamics with Finnis-Sinclair potential,analysed by means of radial distribution functions,coordination number,atomic energy and local crystalline order.The influence of the grain size on the nanocrystalline structure is studied.The results reveal that as the grain size is reduced,the grain boundary shows no significant structural difference,but the grain interior becomes more disordered,and their structural difference diminishes gradually;however,the density and the atomic average energy of the grain boundary present different tendencies from those of the grain interior.展开更多
There are many fault block fields in China. A fault block field consists of fault pools.The small fault pools can be viewed as the closed circle reservoirs in some case. In order to know the pressure change of the dev...There are many fault block fields in China. A fault block field consists of fault pools.The small fault pools can be viewed as the closed circle reservoirs in some case. In order to know the pressure change of the developed formation and provide the formation data for developing the fault block fields reasonably, the transient flow should be researched. In this paper, we use the automatic mesh generation technology and the finite element method to solve the transient flow problem for the well located in the closed circle reservoir, especially for the well located in an arbitrary position in the closed circle reservoir. The pressure diffusion process is visualized and the well-location factor concept is first proposed in this paper. The typical curves of pressure vs time for the well with different welllocation factors are presented. By comparing numerical results with the analytical solutions of the well located in the center of the closed circle reservoir, the numerical method is verified.展开更多
文摘The microstructure of computer generated nanocrystalline coppers is simulated by using molecular dynamics with Finnis-Sinclair potential,analysed by means of radial distribution functions,coordination number,atomic energy and local crystalline order.The influence of the grain size on the nanocrystalline structure is studied.The results reveal that as the grain size is reduced,the grain boundary shows no significant structural difference,but the grain interior becomes more disordered,and their structural difference diminishes gradually;however,the density and the atomic average energy of the grain boundary present different tendencies from those of the grain interior.
文摘There are many fault block fields in China. A fault block field consists of fault pools.The small fault pools can be viewed as the closed circle reservoirs in some case. In order to know the pressure change of the developed formation and provide the formation data for developing the fault block fields reasonably, the transient flow should be researched. In this paper, we use the automatic mesh generation technology and the finite element method to solve the transient flow problem for the well located in the closed circle reservoir, especially for the well located in an arbitrary position in the closed circle reservoir. The pressure diffusion process is visualized and the well-location factor concept is first proposed in this paper. The typical curves of pressure vs time for the well with different welllocation factors are presented. By comparing numerical results with the analytical solutions of the well located in the center of the closed circle reservoir, the numerical method is verified.
