Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a Cylinder
The flow past a cylinder is a classical problem in flow physics. In a certain range of Reynolds number, there will be Karman vortex street phenomenon in the wake of a cylinder, which will greatly increase the pressure drag of the cylinder. By controlling the vortex shedding phenomenon, drag reductio...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/17/5582 |
| _version_ | 1797521371085930496 |
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| author | Rong Han Wei Liu Xiao-Liang Yang Xing-Hua Chang |
| author_facet | Rong Han Wei Liu Xiao-Liang Yang Xing-Hua Chang |
| author_sort | Rong Han |
| collection | DOAJ |
| description | The flow past a cylinder is a classical problem in flow physics. In a certain range of Reynolds number, there will be Karman vortex street phenomenon in the wake of a cylinder, which will greatly increase the pressure drag of the cylinder. By controlling the vortex shedding phenomenon, drag reduction of the cylinder could be effectively realized. In this paper, a NACA0012 airfoil with pitching oscillation is placed downstream of the cylinder. Based on the tight coupling method, kinematics equations and Navier–Stokes equations in the arbitrary Lagrangian–Eulerian form are solved. Firstly, the effect of airfoil oscillation period and the distance between airfoil leading edge and cylinder center (<i>x</i>/<i>D</i>) are studied respectively, especially considering the aspects of vortex shedding and drag reduction effect. Besides, the vortex interaction in the flow field around the airfoil and cylinder is analyzed in detail. It is found that the NACA0012 airfoil with pitching oscillation can change the period of vortex shedding. Moreover, it can also increase the drag reduction rate to as high as 50.5%, which presents a certain application prospect in the engineering drag reduction field, e.g., for launch vehicles, ship masts, submarine pipelines, etc. |
| first_indexed | 2024-03-10T08:11:38Z |
| format | Article |
| id | doaj.art-64beeb126c1442268616510c341e24cb |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T08:11:38Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-64beeb126c1442268616510c341e24cb2023-11-22T10:36:54ZengMDPI AGEnergies1996-10732021-09-011417558210.3390/en14175582Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a CylinderRong Han0Wei Liu1Xiao-Liang Yang2Xing-Hua Chang3College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaUnmanned Systems Research Center, National Innovation Institute of Defense Technology, Beijing 100071, ChinaThe flow past a cylinder is a classical problem in flow physics. In a certain range of Reynolds number, there will be Karman vortex street phenomenon in the wake of a cylinder, which will greatly increase the pressure drag of the cylinder. By controlling the vortex shedding phenomenon, drag reduction of the cylinder could be effectively realized. In this paper, a NACA0012 airfoil with pitching oscillation is placed downstream of the cylinder. Based on the tight coupling method, kinematics equations and Navier–Stokes equations in the arbitrary Lagrangian–Eulerian form are solved. Firstly, the effect of airfoil oscillation period and the distance between airfoil leading edge and cylinder center (<i>x</i>/<i>D</i>) are studied respectively, especially considering the aspects of vortex shedding and drag reduction effect. Besides, the vortex interaction in the flow field around the airfoil and cylinder is analyzed in detail. It is found that the NACA0012 airfoil with pitching oscillation can change the period of vortex shedding. Moreover, it can also increase the drag reduction rate to as high as 50.5%, which presents a certain application prospect in the engineering drag reduction field, e.g., for launch vehicles, ship masts, submarine pipelines, etc.https://www.mdpi.com/1996-1073/14/17/5582flow past a circular cylinderKarman vortex streetNACA0012 airfoilpitching oscillationdrag reduction mechanism |
| spellingShingle | Rong Han Wei Liu Xiao-Liang Yang Xing-Hua Chang Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a Cylinder Energies flow past a circular cylinder Karman vortex street NACA0012 airfoil pitching oscillation drag reduction mechanism |
| title | Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a Cylinder |
| title_full | Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a Cylinder |
| title_fullStr | Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a Cylinder |
| title_full_unstemmed | Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a Cylinder |
| title_short | Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a Cylinder |
| title_sort | effect of naca0012 airfoil pitching oscillation on flow past a cylinder |
| topic | flow past a circular cylinder Karman vortex street NACA0012 airfoil pitching oscillation drag reduction mechanism |
| url | https://www.mdpi.com/1996-1073/14/17/5582 |
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