Three-dimensional instability in flow over a backward-facing step
UNSPECIFIED. (2002) Three-dimensional instability in flow over a backward-facing step. JOURNAL OF FLUID MECHANICS, 473 . pp. 167-190. ISSN 0022-1120Full text not available from this repository.
Official URL: http://dx.doi.org/10.1017/S002211200200232X
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|
|Official Date:||25 December 2002|
|Number of Pages:||24|
|Page Range:||pp. 167-190|
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