### REDUCING THE DRAG ON A CIRCULAR CYLINDER BY UPSTREAM INSTALLATION OF CYLINDER TYPE-I AND DOWNSTREAM INSTALLATION OF ELLIPSE CYLINDER

#### MATTER: International Journal of Science and Technology

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 Field Value Title REDUCING THE DRAG ON A CIRCULAR CYLINDER BY UPSTREAM INSTALLATION OF CYLINDER TYPE-I AND DOWNSTREAM INSTALLATION OF ELLIPSE CYLINDER Creator Hakam, Amirul Imron, Chairul Widodo, Basuki Yuwono, Tri Yogi Subject Reducing the Drag Mathematical Model of the Drag I Passive Control Ellipse Passive Control. Description Various forms and number of passive control have been investigated in order to minimize the drag coefficient received by circular cylinder. Thus, the strength of circular cylinder construction can be maintained longer. In this study, a circular cylinder with two passive controls are the first passive control fix be a cylindrical type-I is placed in front of the cylinder at distance ratio  with difference 0.6, while the second passive cylinder compares the ellipse and horizontal type I which is placed behind the cylinder at a ratio of distance  with difference 0.3. The flow across the circular cylinder with two passive controls in Reynolds 5000 is solved by numerically using the first order finite difference method with the third order error and second order finite difference method with second order error. Differences of second passive control geometry and variation of distance of S / D and T / D have effect on drag coefficient obtained. The minimum drag coefficient is obtained at the distance S / D = 1.8 and T / D = 1.5, using second passive control of the ellipse or horizontal type I cylinder. However, the comparison results that the second passive control of the elliptical shape minimizes the drag coefficient by up to 39% against the cylinder without control. Mathematical model of drag for circular cylinder with passive controls cylinder type I and ellipse is . This model can be used to find the drag coefficient on S/D and T/D directly and easier. Article DOI: https://dx.doi.org/10.20319/mijst.2018.41.2639 This work is licensed under the Creative Commons Attribution-Non-commercial 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA. Publisher Global Research & Development Services Publishing Date 2018-03-15 Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Format application/pdf Identifier https://grdspublishing.org/index.php/matter/article/view/1186 10.20319/mijst.2018.41.2639 Source MATTER: International Journal of Science and Technology; Vol 4 No 1 (2018): Regular Issue; 26-39 2454-5880 Language eng Relation https://grdspublishing.org/index.php/matter/article/view/1186/1033 Rights Copyright (c) 2018 Author(s)

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