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A Numerical Investigation of Flow Drag Reduction by Riblet Surfaces in different geometries and dimensions.
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Hossein Safari *1   , Alireza Raoufpanah2 |
1- Islamic Azad University Yadegar-e-Imam Khomeini (rah) Branch, Mechanical Department, Tehran, Iran , hossfri.unive@gmail.com
2- Islamic Azad University Yadegar-e-Imam Khomeini (rah) Branch, Mechanical Department, Tehran, Iran |
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Abstract: (117 Views) |
| Nowadays, due to the shortage of energy resources, the industries pay more attention to the energy efficiency. in terms of transportation, reducing of energy consumption and increasing the speed of marine vessels and submarines, the surface friction resistance holds an important role. riblets surfaces are a passive method that have ability of surface drag reduction. This study, investigates numearically, the drag reduction of 4 different and new geometries of riblets in different dimensions and velocities. the flow is in the laminar regime range and riblets are aligned perpendicular to the flow direction. Also the distribution of shear stress and static pressure on the riblet surfaces are examined. The Results showed that geometries 1 and 4 have a higher drag reduction (about 10/7% and 10/2%) relative to the geometries 2 and 3 (about 7/7% and 4/4%) Respectively. Unlike geometries 1 and 4, geometries 2 and 3 have a higher viscose force relative to the pressure force on their surfaces. Also the study of speed changes showed that geometries 1 and 4 have a higher drag reduction in each speed respectively. |
Article number: 3 |
| Keywords: Riblet, Drag Reduction, Numerical Simulation |
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Full-Text [PDF 795 kb]
(50 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2022/03/23 | Accepted: 2022/06/26 | Published: 2022/08/15
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