Coherent structures in bypass transition induced by a cylinder wake
Coherent structures in bypass transition induced by a cylinder wake
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气缸尾流引起的旁路过渡中的相干结构
DOI:
10.1017/s0022112008001018
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发表时间:
2008-04
影响因子:
3.7
通讯作者:
Zhang, Pan Feng
中科院分区:
文献类型:
--
作者:
Feng, Li Hao;Pan, Chong;Wang, Jin Jun;Zhang, Pan Feng
Flat-plate boundary layer transition induced by the wake vortex of a two-dimensional circular cylinder is experimentally investigated. Combined visualization and velocity measurements show a different transition route from the Klebanoff mode in free-stream turbulence-induced transition. This transition scenario is mainly characterized as: (i) generation of secondary transverse vortical structures near the flat plate surface in response to the von Kármán vortex street of the cylinder; (ii) formation of hairpin vortices due to the secondary instability of secondary vortical structures; (iii) growth of hairpins which is accelerated by wake-vortex induction; (iv) formation of hairpin packets and the associated streaky structures. Detailed investigation shows that during transition the evolution dynamics and self-sustaining mechanisms of hairpins, hairpin packets and streaks are consistent with those in a turbulent boundary layer. The wake vortex mainly plays the role of generating and destabilizing secondary transverse vortices. After that, the internal mechanisms become dominant and lead to the setting up of a self-sustained turbulent boundary layer.
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影响因子:
2.4
作者:
L. J. Lu;C. Smith
通讯作者:
L. J. Lu;C. Smith
影响因子:
3.7
作者:
W. Schoppa;F. Hussain
通讯作者:
W. Schoppa;F. Hussain
影响因子:
4.6
作者:
P. Andersson;M. Berggren;D. Henningson
通讯作者:
P. Andersson;M. Berggren;D. Henningson
DOI:
10.1007/978-1-4899-5579-1_1
发表时间:
1969
期刊:
--
影响因子:
--
作者:
M. Morkovin
通讯作者:
M. Morkovin
影响因子:
3.7
作者:
J. Kendall
通讯作者:
J. Kendall