Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： In this article we discuss a selected sample of interdisciplinary researches between philosophy and science in the forefront of high energy physics, science of intelligence, biological science, and social science. We discuss both the ideas and the important international institutions and figures.
Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： In order to study the wake structure of three-dimensional tandem multi-cylinder flow at differentI/D (L is the spacing between the cylinders and D is the diameter of the cylinder) , based on the latticeBoltmann method (LBM) , the large eddy simulation ( LES)method was used to calculate the wake flowfield of three-dimensional single cylinder and three-dimensional series multi-cylinder under different L/Dconditions. The results show that LBM-L.ES method can well simulate the wake structure of three-dimen-sional single cylinder and multi-cylinder in series. The wake change of single cylinder with high Reynoldsnumber is unstable.There is a critical spacing ratio L/D=4. When the spacing ratio between cylinders issmaller than the critical spacing ratio , there is no vortex shedding between the cylinders. When the criticalspacing ratio l/D is 4 , the vortex shedding phenomenon is obvious , and the vortex falling off the front cyl-inder affects the rear cylinder , which will have a certain impact on the vibration amplitude of the lift and drag coefficients of the rear cylinder. When the ratio of cylinder spacing is smaller than the critical spac-ing ratio , the time average resistance coefficient curve of the upstream and the downstream of the flow a-round multiple cylinders in series will tum at the critical spacing ratio.When the boundary spacing ratio is4 , adding a cylinder in front of the downstream cylinder will affect the time average resistance coefficient ofthe downstream cylinder and the midstream cylinder. But when the cylinder spacing ratio is greater thanthe critical spacing ratio of 4 , adding a cylinder in front of the downstream cylinder does not affect the timeaverage resistance coefficient of the downstream cylinder or the middle cylinder. The research results havecertain theoretical reference value for practical engineering.
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