We present the simulation of the dynamics of fluid-cylinder interactions in a narrow three-dimensional channel filled with a Newtonian fluid, using a Lagrange multiplier based fictitious domain methodology combined wi...We present the simulation of the dynamics of fluid-cylinder interactions in a narrow three-dimensional channel filled with a Newtonian fluid, using a Lagrange multiplier based fictitious domain methodology combined with a finite element method and an operator splitting technique. As expected, a settling truncated cylinder turns its broadside perpendicular to the main stream direction and the center of mass moves to the central axis of the channel. In the case of two truncated cylinders, they first move around each other for a while and then stay together in a "T" shape. After the "T" shape has been formed for a long enough time, we found no vortex shedding behind the cylinders. When simulating the fluidization of 60 truncated cylinders, we captured the features of interactions among fluidized cylinders as observed in experiments.展开更多
Selecting a site for a nuclear power plant requires extensive studies to ensure its safety and stability during its operation until its decommissioning. The 4,500-year old Egyptian pyramids at Giza are buildings to le...Selecting a site for a nuclear power plant requires extensive studies to ensure its safety and stability during its operation until its decommissioning. The 4,500-year old Egyptian pyramids at Giza are buildings to learn from. This paper tries to pin down the reasons for the survival of the Giza pyramids in order to reach a criterion for choosing sites for important buildings. It argues that the site selection and the geological properties of the area, being away from seismic effects,, floods and groundwater levels, the stability of the geometric form of the pyramid, the solidity of the structural engineering and precision of execution arguably are the reasons why the Great Pyramids of Giza are the only survivors of the seven wonders of the ancient world.展开更多
Peter Burke once said, using images as historical evidence could not only stand as proof of political events, economic trend, and social structure, but also as an illustration of the history of daily life, material cu...Peter Burke once said, using images as historical evidence could not only stand as proof of political events, economic trend, and social structure, but also as an illustration of the history of daily life, material culture, mental state, and physical body. Photography is the extension of human vision, the appearance of which has changed the way in which people see the world, molded the subject identity of modernity, and participated in the social construction of visual modernity. To witness the history is not the only purpose of studying on photograph-based pictorials in the republican period, for which it is more important to provide visual reference for the construction of China＇s modernization, and to witness the multiplicity, mobility, and inner-diversity of modernity.展开更多
文摘We present the simulation of the dynamics of fluid-cylinder interactions in a narrow three-dimensional channel filled with a Newtonian fluid, using a Lagrange multiplier based fictitious domain methodology combined with a finite element method and an operator splitting technique. As expected, a settling truncated cylinder turns its broadside perpendicular to the main stream direction and the center of mass moves to the central axis of the channel. In the case of two truncated cylinders, they first move around each other for a while and then stay together in a "T" shape. After the "T" shape has been formed for a long enough time, we found no vortex shedding behind the cylinders. When simulating the fluidization of 60 truncated cylinders, we captured the features of interactions among fluidized cylinders as observed in experiments.
文摘Selecting a site for a nuclear power plant requires extensive studies to ensure its safety and stability during its operation until its decommissioning. The 4,500-year old Egyptian pyramids at Giza are buildings to learn from. This paper tries to pin down the reasons for the survival of the Giza pyramids in order to reach a criterion for choosing sites for important buildings. It argues that the site selection and the geological properties of the area, being away from seismic effects,, floods and groundwater levels, the stability of the geometric form of the pyramid, the solidity of the structural engineering and precision of execution arguably are the reasons why the Great Pyramids of Giza are the only survivors of the seven wonders of the ancient world.
文摘Peter Burke once said, using images as historical evidence could not only stand as proof of political events, economic trend, and social structure, but also as an illustration of the history of daily life, material culture, mental state, and physical body. Photography is the extension of human vision, the appearance of which has changed the way in which people see the world, molded the subject identity of modernity, and participated in the social construction of visual modernity. To witness the history is not the only purpose of studying on photograph-based pictorials in the republican period, for which it is more important to provide visual reference for the construction of China＇s modernization, and to witness the multiplicity, mobility, and inner-diversity of modernity.
