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

Record Type:	Language materials, printed : 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:

555551
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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300 $a 67 p.
500 $a Source: Masters Abstracts International, Volume: 80-04.
500 $a Publisher info.: Dissertation/Thesis.
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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.
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