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Orientation instabi...
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More, Rishabh, VPurdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA.
(författare)
Orientation instability of settling spheroids in a linearly density-stratified fluid
- Artikel/kapitelEngelska2021
Förlag, utgivningsår, omfång ...
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2021-10-19
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CAMBRIDGE UNIV PRESS,2021
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Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:kth-305615
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-305615URI
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https://doi.org/10.1017/jfm.2021.836DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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QC 20211206
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Much work has been done to understand the settling dynamics of spherical particles in a homogeneous and stratified fluid. However, the effects of shape anisotropy on the settling dynamics of a particle in a stratified fluid are not completely understood. To this end, we perform numerical simulations for settling oblate and prolate spheroids in a stratified fluid. We present the results for the Galileo number, , in the range 80-250 and the Richardson number, , in the range 0-10. We find that both the oblate and prolate spheroids reorient to the edge-wise and partially edge-wise orientations, respectively, as they settle in a stratified fluid completely different from the steady-state broad-side on orientation observed in a homogeneous fluid. We observe that reorientation instabilities emerge when the velocity magnitudes of the spheroids fall below a particular threshold. We also report the enhancement of the drag on the particle from stratification. The torque due to buoyancy effects tries to orient the spheroid in an edge-wise orientation while the hydrodynamic torque tries to orient it to a broad-side on orientation. Below the velocity threshold, the buoyancy torque dominates; resulting in the onset of reorientation instability. Finally, the asymmetry in the distribution of the baroclinic vorticity generation term around the spheroids explains the onset of the reorientation instability.
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Ardekani, Mehdi N.Stanford Univ, Chem Engn, Stanford, CA 94305 USA.
(författare)
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Brandt, LucaKTH,SeRC - Swedish e-Science Research Centre,Strömningsmekanik och Teknisk Akustik(Swepub:kth)u15iawoo
(författare)
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Ardekani, Arezoo M.Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA.
(författare)
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Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA.Stanford Univ, Chem Engn, Stanford, CA 94305 USA.
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Fluid Mechanics: CAMBRIDGE UNIV PRESS9290022-11201469-7645
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