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Orientation instabi...
Orientation instability of settling spheroids in a linearly density-stratified fluid
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- More, Rishabh, V (författare)
- Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA.
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- Ardekani, Mehdi N. (författare)
- Stanford Univ, Chem Engn, Stanford, CA 94305 USA.
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- Brandt, Luca (författare)
- KTH,SeRC - Swedish e-Science Research Centre,Strömningsmekanik och Teknisk Akustik
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- Ardekani, Arezoo M. (författare)
- Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA.
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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)
- 2021-10-19
- 2021
- Engelska.
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Ingår i: Journal of Fluid Mechanics. - : CAMBRIDGE UNIV PRESS. - 0022-1120 .- 1469-7645. ; 929
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- particle
- fluid flow
- stratified flows
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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