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http://dx.doi.org/10.3744/SNAK.2020.57.2.096

Numerical Simulation of Flow around Variable Pitch Helically Elliptic Twisted Cylinder based on the Biomimetic Flow Control  

Moon, Jahoon (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Yoon, Hyun Sik (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Publication Information
Journal of the Society of Naval Architects of Korea / v.57, no.2, 2020 , pp. 96-103 More about this Journal
Abstract
The new geometric disturbance is proposed to control the flow around the bluff body. The new geometry is characterized by the variable pitch which is applied on the Helically Elliptic Twisted (HET) cylinder. The performance of the HTE geometry as a biomimetic passive flow control was confirmed by Jung and Yoon (2014). The Large Eddy Simulation (LES) is used for the evaluation of the flow control performance of the Variable Pitch HTE (VPHTE) cylinder at Reynolds number (Re) of 3000 corresponding to the subcritical regime. The circular and HTE cylinders are also considered to compare the performance of the VPHTE cylinder at the same Re. The VPHTE cylinder gives the smallest values of the force coefficients than the circular and HTE cylinders. The drag and lift coefficients of the VPHTE cylinder are about 15.2% and 94.0% lower than those of the circular cylinder, respectively. Especially, the VPHTE cylinder achieves about 2.3% and 30.0% reduction of the drag coefficient and the root mean square of the lift coefficient than the HTE cylinder, respectively. Furthermore, The VPHTE cylinder forms more elongated and stabilized separated shear layer than the circular cylinder, which supports the reduction of the force coefficients.
Keywords
Variable pitch; Helically Twisted elliptic cylinder; Flow control;
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