|제목(국문)||Solid volume fraction이 20% 인 다공성 실린더 주위의 유동 해석|
|제목(영문)||NUMERICAL SIMULATION OF FLOW PAST A POROUS CYLINDER WITH 20% SOLID VOLUME FRACTION|
(Kyoung Slk Chang
▷공저자 네트워크 보기
(G Constantinescu ,Assistant professor, University of Iowa IIHR ) ▷공저자네트워크등록하기
The presence of a layer of vegetation which is relevant in river engineering or coastal engineering can modify the overall flow resistance, turbulent characteristics of flow. The patch of vegetation can be modelled and studied in a simple porous cylinder by previous researchers. Fully three dimensional Large Eddy Simulation is conducted in flow past a porous cylinder with a solid volume fraction (SVP) of 20%. The porous cylinder of diameter D contains 89 smaller cylinders which diameter is 0.048D in a regular staggered way. Reynolds number based on porous cylinder diameter D and the bulk velocity is 10,000. The large scale shedding is qualitatively similar to the one observed in the non-porous case (SVF= I00%). The difference in the dynamics of the separated shear layer and the streamwise }low penetrating through the porous cylinder are compared with those in the non-porous cylinder. In particular, the wake billows form a larger distance from the back of the porous cylinder.
|keyword||Large Eddy Simulation, Porous cylinder, Coherent structure, Separated Shear Layer
대와류모사, 다공성 실린더, 응집 구조, 박리전단층