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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This study performed a numerical analysis of the hairpin vortex and heattransport generated by the interference of the wakes behind two hills in alaminar boundary layer. In the case of hills with the same scale, theinterference between hairpin vortices in the wake is more intensive than in thedifferent-scale hills. When the hills with different scales are installed,hairpin vortices with different scales are periodically shed. Regardless of thescale ratio of the hills, when the hill spacing in the spanwise direction isnarrowed, the asymmetry of the hairpin vortex in the wake increases due to theinterference between the wakes. At this time, the turbulence caused by the legand the horn-shaped secondary vortex on the spanwise center side in the hairpinvortex increases, and heat transport around the hairpin vortex becomes active.In addition, the leg approaches the wall surface and removes high-temperaturefluid near the wall surface over a wide area, resulting in a high heat transfercoefficient. These tendencies are most remarkable in the same-scale hills. Inthe case of hills with different scales, the heat transfer coefficientdecreases because the leg on the spanwise center side in a small hairpin vortexdoes not develop downstream.

Hairpin vortices and heat transfer in the wakes behind two hills with different scales