{rfName}
On

Indexed in

License and Use

Icono OpenAccess

Citations

204

Altmetrics

Analysis of institutional authors

Theofilis V.Author

Share

July 23, 2024
Publications
>
Article
Green

On the origins of unsteadiness and three-dimensionality in a laminar separation bubble

Publicated to: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES. 358 (1777): 3229-3246 - 2000-01-01 358(1777), DOI: 10.1098/rsta.2000.0706

Authors:

Theofilis V; Hein S; Dallmann U
[+]

Affiliations

Deutsches Zentrum F. Luft- R.; Inst. Fluid Mechanics; Transition T.; D-37073 Göttingen; Bunsenstraße 10; Germany - Author

Abstract

We analyse the three-dimensional non-parallel instability mechanisms responsible for transition to turbulence in regions of recirculating steady laminar two-dimensional incompressible separation bubble flow in a twofold manner. First, we revisit the problem of Tollmien-Schlichting (TS)-like disturbances and we demonstrate, for the first time for this type of flow, excellent agreement between the parabolized stability equation results and those of independently performed direct numerical simulations. Second, we perform a partial-derivative eigenvalue problem stability analysis by discretizing the two spatial directions on which the basic flow depends, precluding TS-like waves from entering the calculation domain. A new two-dimensional set of global amplified instability modes is thus discovered. In order to prove earlier topological conjectures about the flow structural changes occurring prior to the onset of bubble unsteadiness, we reconstruct the total flowfield by linear superposition of the steady two-dimensional basic flow and the new most-amplified global eigenmodes. In the parameter range investigated, the result is a bifurcation into a three-dimensional flowfield in which the separation line remains unaffected while the primary reattachment line becomes three dimensional, in line with the analogous result of a multitude of experimental observations.
[+]

Keywords

Global instabilityLaminar separation bubbleLinear non-local instabilityStructural instabilityTopological flow changes

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2000, it was in position 7/49, thus managing to position itself as a Q1 (Primer Cuartil), in the category Multidisciplinary Sciences.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2026-04-24:

  • Scopus: 175
[+]

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2026-04-24:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 100.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 100 (PlumX).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: https://oa.upm.es/10442/

As a result of the publication of the work in the institutional repository, statistical usage data has been obtained that reflects its impact. In terms of dissemination, we can state that, as of

  • Views: 430
  • Downloads: 489
[+]

Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Germany.

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (THEOFILIS, VASSILIOS) .

[+]