It seems that the combination of teaching practices creates interesting results in several areas of knowledge. The teacher has to always bear in mind that he/she has to present educational contents regarding his disci...It seems that the combination of teaching practices creates interesting results in several areas of knowledge. The teacher has to always bear in mind that he/she has to present educational contents regarding his discipline always trying to present it an attractive way through new teaching dynamics. The challenge is to not to distance from the curricular content by using a broader educational proposal, intensifying the interaction with the students with the problems related to the professional area with artifacts and tools. Under such circumstances, the computer simulation can be a valuable teaching tool for the necessary contents in the formation of students. The preliminary studies based on students＇ opinions indicate it as a promising practice.展开更多
Conventionally, multiple reference frame(MRF) method and sliding mesh(SM) method are used in the simulation of stirred tanks, however, both methods have limitations. In this study, a hybrid immersed-boundary(IB)techni...Conventionally, multiple reference frame(MRF) method and sliding mesh(SM) method are used in the simulation of stirred tanks, however, both methods have limitations. In this study, a hybrid immersed-boundary(IB)technique is developed in a finite difference context for the numerical simulation of stirred tanks. IBs based on Lagrangian markers and solid volume fractions are used for moving and stationary boundaries, respectively, to achieve optimal efficiency and accuracy. To cope with the high computational cost in the simulation of stirred tanks, the technique is implemented on computers with hybrid architecture where central processing units(CPUs) and graphics processing units(GPUs) are used together. The accuracy and efficiency of the present technique are first demonstrated in a relatively simple case, and then the technique is applied to the simulation of turbulent flow in a Rushton stirred tank with large eddy simulation(LES). Finally the proposed methodology is coupled with discrete element method(DEM) to accomplish particle-resolved simulation of solid suspensions in small stirred tanks. It demonstrates that the proposed methodology is a promising tool in simulating turbulent flow in stirred tanks with complex geometries.展开更多
文摘It seems that the combination of teaching practices creates interesting results in several areas of knowledge. The teacher has to always bear in mind that he/she has to present educational contents regarding his discipline always trying to present it an attractive way through new teaching dynamics. The challenge is to not to distance from the curricular content by using a broader educational proposal, intensifying the interaction with the students with the problems related to the professional area with artifacts and tools. Under such circumstances, the computer simulation can be a valuable teaching tool for the necessary contents in the formation of students. The preliminary studies based on students＇ opinions indicate it as a promising practice.
基金Supported by the National Natural Science Foundation of China(21225628,51106168,11272312)the“Strategic Priority Research Program”of the Chinese Academy of Sciences(XDA07080000)
文摘Conventionally, multiple reference frame(MRF) method and sliding mesh(SM) method are used in the simulation of stirred tanks, however, both methods have limitations. In this study, a hybrid immersed-boundary(IB)technique is developed in a finite difference context for the numerical simulation of stirred tanks. IBs based on Lagrangian markers and solid volume fractions are used for moving and stationary boundaries, respectively, to achieve optimal efficiency and accuracy. To cope with the high computational cost in the simulation of stirred tanks, the technique is implemented on computers with hybrid architecture where central processing units(CPUs) and graphics processing units(GPUs) are used together. The accuracy and efficiency of the present technique are first demonstrated in a relatively simple case, and then the technique is applied to the simulation of turbulent flow in a Rushton stirred tank with large eddy simulation(LES). Finally the proposed methodology is coupled with discrete element method(DEM) to accomplish particle-resolved simulation of solid suspensions in small stirred tanks. It demonstrates that the proposed methodology is a promising tool in simulating turbulent flow in stirred tanks with complex geometries.
