English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

It was reported in earlier papers by the present authors that longitudinal vortices shed periodically from two cylinders in a cruciform arrangement with a gap s between them, placed in otherwise uniform flow. The longitudinal vortices can cause a strong vibration of the upstream cylinder. When the gap-to-diameter ratio s/d≤0.25, trailing vortices are shed periodically, and when 0.25≤s/d≤0.5, necklace vortices are shed periodically.In this work, the structure and the shedding process of the two types of the longitudinal vortices were investigated through flow visualization in a water tunnel. The vortex shedding frequency fv was obtained by a hot-film anemometer. Results concerning St-Re (St :Strouhal number, Re :Reynolds number) relationship for the longitudinal vortices obtained by the water tunnel measurements were found to correlate well with those by wind tunnel measurements.

Structure of longitudinal vortices shedding periodically from two cylinders in a cruciform arrangement