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Three-dimensional instability in flow over a backward-facing step
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UNSPECIFIED. (2002) Three-dimensional instability in flow over a backward-facing step. JOURNAL OF FLUID MECHANICS, 473 . pp. 167-190. ISSN 0022-1120
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Official URL: http://dx.doi.org/10.1017/S002211200200232X
Abstract
Results are reported from a three-dimensional computational stability analysis of flow over a backward-facing step with an expansion ratio (outlet to inlet height) of 2 at Reynolds numbers between 450 and 1050. The analysis shows that the first absolute linear instability of the steady two-dimensional flow is a steady three-dimensional bifurcation at a critical Reynolds number of 748. The critical eigenmode is localized to the primary separation bubble and has a flat roll structure with a spanwise wavelength of 6.9 step heights. The system is further shown to be absolutely stable to two-dimensional perturbations up to a Reynolds number of 1500. Stability spectra and visualizations of the global modes of the system are presented for representative Reynolds numbers.
| Item Type: | Journal Article |
|---|---|
| Subjects: | T Technology > TJ Mechanical engineering and machinery Q Science > QC Physics |
| Journal or Publication Title: | JOURNAL OF FLUID MECHANICS |
| Publisher: | CAMBRIDGE UNIV PRESS |
| ISSN: | 0022-1120 |
| Date: | 25 December 2002 |
| Volume: | 473 |
| Number of Pages: | 24 |
| Page Range: | pp. 167-190 |
| Identification Number: | 10.1017/S002211200200232X |
| Publication Status: | Published |
| URI: | http://wrap.warwick.ac.uk/id/eprint/10224 |
Data sourced from Thomson Reuters' Web of Knowledge
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