The finite element method was used to solve fluid dynamic interaction problems between the crust and mantle of the Earth. To consider different mechanical behaviours, the lithosphere consisting of the crust and upper ...The finite element method was used to solve fluid dynamic interaction problems between the crust and mantle of the Earth. To consider different mechanical behaviours, the lithosphere consisting of the crust and upper mantle was simulated as fluid-saturated porous rocks, while the upper aesthenospheric part of the mantle was simulated as viscous fluids. Since the whole lithosphere was computationally simulated, the dynamic interaction between the crust and the upper mantle was appropriately considered. In particular, the mixing of mantle fluids and crustal fluids was simulated in the corresponding computational model. The related computational simulation results from an example problem demonstrate that the mantle fluids can flow into the crust and mix with the crustal fluids due to the resulting convective flows in the crust-mantle system. Likewise, the crustal fluids can also flow into the upper mantle and mix with the mantle fluids. This kind of fluids mixing and exchange is very important to the better understanding of the governing processes that control the ore body formation and mineralization in the upper crust of the Earth.展开更多
This article is the written version of a lecture given at the Festkolloquium on the occasion of Prof. Dr.-Ing. Dr.techn. E.h. Jtirgen Zierep＇s 80th birthday held at the Universitat Karlsruhe, 21 January 2009. It deal...This article is the written version of a lecture given at the Festkolloquium on the occasion of Prof. Dr.-Ing. Dr.techn. E.h. Jtirgen Zierep＇s 80th birthday held at the Universitat Karlsruhe, 21 January 2009. It deals with laminar viscous inviscid interactions in transonic narrow channel flows. Special emphasis is placed on the internal structure of pseudo-shocks and properties of nozzle flows. Also, it is shown that the theory, first formulated for perfect gases, can easily be extended to the case of general single phase fluids.展开更多
Normal shock wave, terminating a local supersonic area on an airfoil, limits its performance and becomes a source of high speed impulsive noise. It is proposed to use passive control to disintegrate the shock wave. De...Normal shock wave, terminating a local supersonic area on an airfoil, limits its performance and becomes a source of high speed impulsive noise. It is proposed to use passive control to disintegrate the shock wave. Details of the flow structure obtained by this method are studied numerically. A new boundary condition has been developed and the results of its application are verified against experiments in a nozzle flow. The method of shock wave disintegration has been confirmed and detailed analysis of the flow details is presented. The substitution of a shock wave by a gradual compression changes completely the source of the high speed impulsive noise and bears potential of its reduction.展开更多
The harmonious relationship among East Asian countries has a very long history. However, it has faced serious challenges in the past hundred years. In these eventful years for our nation, Chinese literature, like the ...The harmonious relationship among East Asian countries has a very long history. However, it has faced serious challenges in the past hundred years. In these eventful years for our nation, Chinese literature, like the Chinese people, has endured hardships and pondered ways of extricating the country from its malaise. In addition to being concerned over China＇s enlightenment, salvation, independence and rejuvenation, writers have also paid considerable attention to important international forces that had a strong influence on their country＇s fate. Concern over and understanding of the Korean nation bad a particular emotional charge and relevance to their own fate. Over the course of a century, Chinese literature＇s awareness of Korea went through four stages. In the first, Korea＇s loss of independence served as a mirror of China＇s own dangerous position, menaced on all sides; in the second, the Korean people were seen as comrades-in-arms combating foreign foes; in the third, when the Korean Peninsula was divided, North Koreans continued to be regarded as comrades-in-arms while South Korea was not acknowledged; and in the final stage, amidst the interaction between ＂China style＂ and the ＂Korean wave,＂ Chinese literature＇s awareness of Korea expanded through a penetrating appreciation of Korean history involving deep ties of courage and uprightness.展开更多
基金Project(10872219) supported by the National Natural Science Foundation of China
文摘The finite element method was used to solve fluid dynamic interaction problems between the crust and mantle of the Earth. To consider different mechanical behaviours, the lithosphere consisting of the crust and upper mantle was simulated as fluid-saturated porous rocks, while the upper aesthenospheric part of the mantle was simulated as viscous fluids. Since the whole lithosphere was computationally simulated, the dynamic interaction between the crust and the upper mantle was appropriately considered. In particular, the mixing of mantle fluids and crustal fluids was simulated in the corresponding computational model. The related computational simulation results from an example problem demonstrate that the mantle fluids can flow into the crust and mix with the crustal fluids due to the resulting convective flows in the crust-mantle system. Likewise, the crustal fluids can also flow into the upper mantle and mix with the mantle fluids. This kind of fluids mixing and exchange is very important to the better understanding of the governing processes that control the ore body formation and mineralization in the upper crust of the Earth.
文摘This article is the written version of a lecture given at the Festkolloquium on the occasion of Prof. Dr.-Ing. Dr.techn. E.h. Jtirgen Zierep＇s 80th birthday held at the Universitat Karlsruhe, 21 January 2009. It deals with laminar viscous inviscid interactions in transonic narrow channel flows. Special emphasis is placed on the internal structure of pseudo-shocks and properties of nozzle flows. Also, it is shown that the theory, first formulated for perfect gases, can easily be extended to the case of general single phase fluids.
文摘Normal shock wave, terminating a local supersonic area on an airfoil, limits its performance and becomes a source of high speed impulsive noise. It is proposed to use passive control to disintegrate the shock wave. Details of the flow structure obtained by this method are studied numerically. A new boundary condition has been developed and the results of its application are verified against experiments in a nozzle flow. The method of shock wave disintegration has been confirmed and detailed analysis of the flow details is presented. The substitution of a shock wave by a gradual compression changes completely the source of the high speed impulsive noise and bears potential of its reduction.
文摘The harmonious relationship among East Asian countries has a very long history. However, it has faced serious challenges in the past hundred years. In these eventful years for our nation, Chinese literature, like the Chinese people, has endured hardships and pondered ways of extricating the country from its malaise. In addition to being concerned over China＇s enlightenment, salvation, independence and rejuvenation, writers have also paid considerable attention to important international forces that had a strong influence on their country＇s fate. Concern over and understanding of the Korean nation bad a particular emotional charge and relevance to their own fate. Over the course of a century, Chinese literature＇s awareness of Korea went through four stages. In the first, Korea＇s loss of independence served as a mirror of China＇s own dangerous position, menaced on all sides; in the second, the Korean people were seen as comrades-in-arms combating foreign foes; in the third, when the Korean Peninsula was divided, North Koreans continued to be regarded as comrades-in-arms while South Korea was not acknowledged; and in the final stage, amidst the interaction between ＂China style＂ and the ＂Korean wave,＂ Chinese literature＇s awareness of Korea expanded through a penetrating appreciation of Korean history involving deep ties of courage and uprightness.
