Timoshin, SN;
(2005)
Feedback instability in a boundary-layer flow over roughness.
MATHEMATIKA
, 52
(1-2)
161 - 168.
10.1112/S0025579300000437.
![[thumbnail of download10.pdf]](https://discovery-pp.ucl.ac.uk/style/images/fileicons/application_pdf.png) Preview |
PDF
download10.pdf Available under License : See the attached licence file. Download (107kB) |
Abstract
Linear stability of an incompressible triple-deck flow over a wall roughness is considered for disturbances of high frequency. The wall roughness consists of two relatively short obstacles placed far apart on an otherwise flat surface. It is shown that the flow is unstable to feedback or global mode disturbances. The feedback loop is formed by algebraically decaying disturbances propagating upstream and weakly growing Tollmien-Schlichting waves travelling downstream and as such represents an interaction between modes from continuous and discrete spectra of the corresponding parallel-flow problem. An example of growth rate calculation for a specific roughness is considered.
| Type: | Article |
|---|---|
| Title: | Feedback instability in a boundary-layer flow over roughness |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1112/S0025579300000437 |
| Publisher version: | http://dx.doi.org/10.1112/S0025579300000437 |
| Language: | English |
| Additional information: | © 2005 Cambridge University Press |
| Keywords: | SPATIALLY DEVELOPING FLOWS, STABILITY |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Mathematics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/70246 |
Archive Staff Only
 |
View Item |
