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Passive Surface Flow Tailoring with ...

Lulekar, Sumeet.

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Passive Surface Flow Tailoring with Optimized Bio-inspired Riblets on 3D-Airfoil.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Passive Surface Flow Tailoring with Optimized Bio-inspired Riblets on 3D-Airfoil./
Author:	Lulekar, Sumeet.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	67 p.
Notes:	Source: Masters Abstracts International, Volume: 80-04.
Contained By:	Masters Abstracts International80-04.
Subject:	Fluid mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10932412
ISBN:	9780438457119

Passive Surface Flow Tailoring with Optimized Bio-inspired Riblets on 3D-Airfoil.
Lulekar, Sumeet.

Passive Surface Flow Tailoring with Optimized Bio-inspired Riblets on 3D-Airfoil. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 67 p.

Source: Masters Abstracts International, Volume: 80-04.

Thesis (M.S.)--State University of New York at Buffalo, 2019.

This item must not be sold to any third party vendors.

Passive surface elements have proven to improve the drag performance of the system by altering the near-wall flow structures. They are extremely effective in the transitional to turbulent flow regime. The shape of these elements are highly inspired from the scales found on the shark, and are simplistically rendered by many fluid dynamicist and experimentalist to replicate the phenomenon and achieve drag reduction over the surface. Unlike more conventional geometries (e.g., blade, rectangular, sawtooth, or scalloped etc) of the surface riblets, a smoother and parameterizable riblet geometry (defined by a gaussian curve) is studied and explored. The drag reduction performance of the riblets over a surface greatly depends on the incoming Reynolds number and the state of the boundary layer. To obtain the maximum drag reduction over the surface, gaussian shape riblets are optimized using a variable fidelity optimization approach. Where the flow physics is evaluated using RANS -based CFD simulation. The riblets are aligned with the incoming freestream velocity and run along the whole chord length and initially, are placed only on the top surface of the 3D-NACA$0012$ airfoil, and optimization is performed for different angle of attack separately. Upto 9\\% of drag reduction is observed with optimal riblet design, compared to the bare 3D airfoil section. Also, various other riblet arrangements are evaluated to explain the effectiveness of the riblets.

ISBN: 9780438457119Subjects--Topical Terms:

528155
Fluid mechanics.
Subjects--Index Terms:

Bio-inspired fluid dynamics

Passive Surface Flow Tailoring with Optimized Bio-inspired Riblets on 3D-Airfoil.
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245 1 0 $a Passive Surface Flow Tailoring with Optimized Bio-inspired Riblets on 3D-Airfoil.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 67 p.
500 $a Source: Masters Abstracts International, Volume: 80-04.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Chowdhury, Souma.
502 $a Thesis (M.S.)--State University of New York at Buffalo, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a Passive surface elements have proven to improve the drag performance of the system by altering the near-wall flow structures. They are extremely effective in the transitional to turbulent flow regime. The shape of these elements are highly inspired from the scales found on the shark, and are simplistically rendered by many fluid dynamicist and experimentalist to replicate the phenomenon and achieve drag reduction over the surface. Unlike more conventional geometries (e.g., blade, rectangular, sawtooth, or scalloped etc) of the surface riblets, a smoother and parameterizable riblet geometry (defined by a gaussian curve) is studied and explored. The drag reduction performance of the riblets over a surface greatly depends on the incoming Reynolds number and the state of the boundary layer. To obtain the maximum drag reduction over the surface, gaussian shape riblets are optimized using a variable fidelity optimization approach. Where the flow physics is evaluated using RANS -based CFD simulation. The riblets are aligned with the incoming freestream velocity and run along the whole chord length and initially, are placed only on the top surface of the 3D-NACA$0012$ airfoil, and optimization is performed for different angle of attack separately. Upto 9\\% of drag reduction is observed with optimal riblet design, compared to the bare 3D airfoil section. Also, various other riblet arrangements are evaluated to explain the effectiveness of the riblets.
590 $a School code: 0656.
650 4 $a Fluid mechanics. $3 528155
650 4 $a Design. $3 518875
650 4 $a Aerospace engineering. $3 1002622
653 $a Bio-inspired fluid dynamics
653 $a Passive flow control
653 $a Riblets
653 $a Surrogate-based optimization
653 $a Variable-fidelity optimization
690 $a 0204
690 $a 0389
690 $a 0538
710 2 $a State University of New York at Buffalo. $b Mechanical and Aerospace Engineering. $3 1017747
773 0 $t Masters Abstracts International $g 80-04.
790 $a 0656
791 $a M.S.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10932412