A numerical study of gravity-driven instability in strongly coupled dusty plasma. Part 3: Homo-interaction between a pair of rising/falling bubbles/droplets
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| Format: | Preprint |
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2024
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| _version_ | 1866916173252132864 |
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| author | Dharodi, Vikram Kostadinova, Evdokiya |
| author_facet | Dharodi, Vikram Kostadinova, Evdokiya |
| contents | A numerical study of the homo-interactions between two falling droplets and between two rising bubbles in a strongly coupled dusty plasma medium is presented in this article. This strongly coupled dusty plasma is considered as a viscoelastic fluid using the generalized hydrodynamic fluid model formalism. Two factors that affect homo-interactions are taken into account: the initial spacing and the coupling strength of the medium. Three different spacings between two droplets are simulated: widely, medium, and closely. In each case, the coupling strength has been given as mild-strong and strong. It is shown that the overall dynamic is governed by the competition between the acceleration of two droplets/bubbles due to gravity and the interaction due to the closeness of the droplets/bubbles. Especially in viscoelastic fluids, the closeness between two droplets/bubbles, aside from their initial separation, at a later time may result from shear waves that emerge from rotating vorticies. For widely-spaced, unlike classical hydrodynamic fluids, we find that shear waves in viscoelastic fluids facilitate the pairing between two bubbles/droplets. In the case of medium-spaced, the two new dipoles of unequal strength blobs exhibit a circular motion and exchange their partners. For closely-spaced, the droplet/bubble fall/rise is suppressed as the coupling strength of the medium increases. Numerous two-dimensional simulations have been carried out. This work is a continuation of the work done in parts I (V. S. Dharodi and A. Das, J. Plasma Phys. 87 (02), 905870216 (2021)) and II (V. S. Dharodi, J. Plasma Phys. 87 (04), 905870402 (2021)). |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_15846 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A numerical study of gravity-driven instability in strongly coupled dusty plasma. Part 3: Homo-interaction between a pair of rising/falling bubbles/droplets Dharodi, Vikram Kostadinova, Evdokiya Plasma Physics A numerical study of the homo-interactions between two falling droplets and between two rising bubbles in a strongly coupled dusty plasma medium is presented in this article. This strongly coupled dusty plasma is considered as a viscoelastic fluid using the generalized hydrodynamic fluid model formalism. Two factors that affect homo-interactions are taken into account: the initial spacing and the coupling strength of the medium. Three different spacings between two droplets are simulated: widely, medium, and closely. In each case, the coupling strength has been given as mild-strong and strong. It is shown that the overall dynamic is governed by the competition between the acceleration of two droplets/bubbles due to gravity and the interaction due to the closeness of the droplets/bubbles. Especially in viscoelastic fluids, the closeness between two droplets/bubbles, aside from their initial separation, at a later time may result from shear waves that emerge from rotating vorticies. For widely-spaced, unlike classical hydrodynamic fluids, we find that shear waves in viscoelastic fluids facilitate the pairing between two bubbles/droplets. In the case of medium-spaced, the two new dipoles of unequal strength blobs exhibit a circular motion and exchange their partners. For closely-spaced, the droplet/bubble fall/rise is suppressed as the coupling strength of the medium increases. Numerous two-dimensional simulations have been carried out. This work is a continuation of the work done in parts I (V. S. Dharodi and A. Das, J. Plasma Phys. 87 (02), 905870216 (2021)) and II (V. S. Dharodi, J. Plasma Phys. 87 (04), 905870402 (2021)). |
| title | A numerical study of gravity-driven instability in strongly coupled dusty plasma. Part 3: Homo-interaction between a pair of rising/falling bubbles/droplets |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2403.15846 |