NDLI: Streamwise streaks and secondary instability in a two-dimensional bent channel

Content Provider	Springer Nature Link
Author	Park, Donghun Park, Seung O.
Copyright Year	2013
Abstract	Streamwise streaks generated from a pair of oblique waves and secondary instability of the streaks are studied in a two-dimensional bent channel. Nonlinear parabolized stability equations (NPSE) are employed to investigate streamwise streaks and vortices. A pair of oblique waves from linear stability analysis is imposed as initial disturbances. Generation of streamwise streaks and vortices and subsequent development are described in detail. The case of plane channel is also studied to provide comparable data. Through comparison, the effect of bent region is clearly highlighted. Results of parametric studies to examine the effect of Reynolds number, radius of curvature, and bent angle are also given and discussed in detail. Secondary instability analysis for the modified mean flow due to the streamwise streaks is carried out by solving a two-dimensional eigenvalue problem. Several unstable modes which can be classified into fundamental and subharmonic mode of secondary instability are identified. Among several unstable modes, two modes are turned out to be dominant modes. Details on these two modes including generation mechanism, typical pattern, and dependency on wave number and streak amplitude are discussed. It is found that the presence of bent channel can lead to early oblique-mode breakdown via strong growth of the streamwise streaks due to the curved section. Such large amplitude of streaks and its secondary instability eventually could trigger transition even for small amplitude oblique waves at subcritical channel Reynolds numbers.
Starting Page	267
Ending Page	293
Page Count	27
File Format	PDF
ISSN	09354964
Journal	Theoretical and Computational Fluid Dynamics
Volume Number	28
Issue Number	3
e-ISSN	14322250
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-11-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Channel flows Streamwise streaks instability Oblique transition Engineering Fluid Dynamics Classical Continuum Physics Computational Science and Engineering
Content Type	Text
Resource Type	Article
Subject	Fluid Flow and Transfer Processes Condensed Matter Physics Computational Mechanics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Use of natural instabilities for generation of streamwise vortices in a laminar channel flow

A new calculus for two-dimensional vortex dynamics

Global instabilities in diverging channel flows

2D vortex interaction in a non-uniform flow

Instabilities in free-surface electroosmotic flows

The structural instability of transonic flow associated with amalgamation/splitting of supersonic regions

Special issue on global flow instability and control

Special issue on magnetohydrodynamic flows

MHD duct flows under hydrodynamic “slip” condition

Streamwise streaks and secondary instability in a two-dimensional bent channel

Similar Documents

Use of natural instabilities for generation of streamwise vortices in a laminar channel flow

A new calculus for two-dimensional vortex dynamics

Global instabilities in diverging channel flows

2D vortex interaction in a non-uniform flow

Instabilities in free-surface electroosmotic flows

The structural instability of transonic flow associated with amalgamation/splitting of supersonic regions

Special issue on global flow instability and control

Special issue on magnetohydrodynamic flows

MHD duct flows under hydrodynamic “slip” condition

Streamwise streaks and secondary instability in a two-dimensional bent channel