Global stability of a jet in crossflow
2009 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 624, 33-44 p.Article in journal (Refereed) Published
A linear stability analysis shows that the jet in crossflow is characterized by self-sustained global oscillations for a jet-to-crossflow velocity ratio of 3. A fully three-dimensional unstable steady-state solution and its associated global eigenmodes are computed by direct numerical simulations and iterative eigenvalue routines. The steady flow, obtained by means of selective frequency damping, consists mainly of a (steady) counter-rotating vortex pair (CVP) in the far field and horseshoe-shaped vortices close to the wall. High-frequency unstable global eigenmodes associated with shear-layer instabilities on the CVP and low-frequency modes associated with shedding vortices in the wake of the jet are identified. Furthermore, different spanwise symmetries of the global modes are discussed. This work constitutes the first simulation-based global stability analysis of a fully three-dimensional base flow.
Place, publisher, year, edition, pages
2009. Vol. 624, 33-44 p.
Baseflows, Counter-rotating Vortex Pair, Crossflow velocities, Eigen modes, Eigen-value, Far field, Global stability, Global stability analysis, High frequency HF, Jet in crossflow, Low-frequency modes, Shedding vortex, Simulation-based, Steady state solution, Direct numerical simulation, Flow separation, Flow simulation, Groundwater flow, Jets, Linear stability analysis, Three dimensional
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-8501DOI: 10.1017/S0022112009006053ISI: 000265754000003ScopusID: 2-s2.0-65649120402OAI: oai:DiVA.org:kth-8501DiVA: diva2:13844
QC 201011032008-05-232008-05-232010-11-03Bibliographically approved