Orientation of a cone settling in a vertical duct. Yu, Z., Pan, D., Lin, J., & Shao, X. *Fluid Dynamics Research*, 46(1):15502, 2014.

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Website abstract bibtex

The orientation of a cone settling in a vertical duct has been numerically investigated by using the direct-forcing fictitious domain method. Our results indicate that with the characteristic Reynolds number Re being 30, the cone settles with apex pointing upward if the cone apex angle is smaller than 48°, irrespective of the initial orientation. For the apex angle larger than 48°, the cone also turns upward as long as the releasing angle is smaller than a critical one, otherwise it either turns to an inclined angle if the apex angle is smaller than (or equal to) 52°, or turns downward for the apex angle larger than 52°. The fluid inertial effect helps to turn the cone downward and both the critical apex angle for the unanimous upward-turning and the releasing angle for the turning direction at a fixed apex angle become smaller for a higher Reynolds number, although the effects of the Reynolds number on the critical angles are not enormous. The hairpin-like vortex structures are observed in the wake of the settling cone at Re = 400, accompanied by the persistent oscillation of the orientation angle. Both stable tilted and apex-upward orientations for the cone with the apex angle of 50°, depending on the releasing angle, are confirmed in our experiments.

@article{ title = {Orientation of a cone settling in a vertical duct}, type = {article}, year = {2014}, pages = {15502}, volume = {46}, websites = {http://stacks.iop.org/1873-7005/46/i=1/a=015502}, id = {0d919add-13d4-34e7-8b88-3ba13d31cf52}, created = {2017-04-07T11:24:12.349Z}, file_attached = {false}, profile_id = {8ed71629-1ab2-30d3-a444-d920308d197a}, last_modified = {2017-04-07T11:25:08.333Z}, read = {false}, starred = {false}, authored = {true}, confirmed = {false}, hidden = {false}, source_type = {article}, private_publication = {false}, abstract = {The orientation of a cone settling in a vertical duct has been numerically investigated by using the direct-forcing fictitious domain method. Our results indicate that with the characteristic Reynolds number Re being 30, the cone settles with apex pointing upward if the cone apex angle is smaller than 48°, irrespective of the initial orientation. For the apex angle larger than 48°, the cone also turns upward as long as the releasing angle is smaller than a critical one, otherwise it either turns to an inclined angle if the apex angle is smaller than (or equal to) 52°, or turns downward for the apex angle larger than 52°. The fluid inertial effect helps to turn the cone downward and both the critical apex angle for the unanimous upward-turning and the releasing angle for the turning direction at a fixed apex angle become smaller for a higher Reynolds number, although the effects of the Reynolds number on the critical angles are not enormous. The hairpin-like vortex structures are observed in the wake of the settling cone at Re = 400, accompanied by the persistent oscillation of the orientation angle. Both stable tilted and apex-upward orientations for the cone with the apex angle of 50°, depending on the releasing angle, are confirmed in our experiments.}, bibtype = {article}, author = {Yu, Zhaosheng and Pan, Dingyi and Lin, Jianzhong and Shao, Xueming}, journal = {Fluid Dynamics Research}, number = {1} }

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