Inviscid linear stability analysis of two vertical columns of different densities in a gravitational acceleration field
Abstract
Here, we study the inviscid linear stability of a vertical interface separating two fluids of different densities and subject to a gravitational acceleration field parallel to the interface. In this arrangement, the two free streams are constantly accelerated, which means that the linear stability analysis is not amenable to Fourier or Laplace solution in time. Instead, we derive the equations analytically by the initial-value problem method and express the solution in terms of the well-known parabolic cylinder function. The results, which can be classified as an accelerating Kelvin–Helmholtz configuration, show that even in the presence of surface tension, the interface is unconditionally unstable at all wavemodes. This is a consequence of the ever increasing momentum of the free streams, as gravity accelerates them indefinitely. The instability can be shown to grow as the exponential of a quadratic function of time.
- Authors:
-
- Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
- Publication Date:
- Research Org.:
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
- OSTI Identifier:
- 1434324
- Grant/Contract Number:
- NA0002382
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Fluid Mechanics
- Additional Journal Information:
- Journal Volume: 826; Journal ID: ISSN 0022-1120
- Publisher:
- Cambridge University Press
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; baroclinic flows; instability
Citation Formats
Prathama, Aditya Heru, and Pantano, Carlos. Inviscid linear stability analysis of two vertical columns of different densities in a gravitational acceleration field. United States: N. p., 2017.
Web. doi:10.1017/jfm.2017.511.
Prathama, Aditya Heru, & Pantano, Carlos. Inviscid linear stability analysis of two vertical columns of different densities in a gravitational acceleration field. United States. https://doi.org/10.1017/jfm.2017.511
Prathama, Aditya Heru, and Pantano, Carlos. Wed .
"Inviscid linear stability analysis of two vertical columns of different densities in a gravitational acceleration field". United States. https://doi.org/10.1017/jfm.2017.511. https://www.osti.gov/servlets/purl/1434324.
@article{osti_1434324,
title = {Inviscid linear stability analysis of two vertical columns of different densities in a gravitational acceleration field},
author = {Prathama, Aditya Heru and Pantano, Carlos},
abstractNote = {Here, we study the inviscid linear stability of a vertical interface separating two fluids of different densities and subject to a gravitational acceleration field parallel to the interface. In this arrangement, the two free streams are constantly accelerated, which means that the linear stability analysis is not amenable to Fourier or Laplace solution in time. Instead, we derive the equations analytically by the initial-value problem method and express the solution in terms of the well-known parabolic cylinder function. The results, which can be classified as an accelerating Kelvin–Helmholtz configuration, show that even in the presence of surface tension, the interface is unconditionally unstable at all wavemodes. This is a consequence of the ever increasing momentum of the free streams, as gravity accelerates them indefinitely. The instability can be shown to grow as the exponential of a quadratic function of time.},
doi = {10.1017/jfm.2017.511},
journal = {Journal of Fluid Mechanics},
number = ,
volume = 826,
place = {United States},
year = {Wed Aug 09 00:00:00 EDT 2017},
month = {Wed Aug 09 00:00:00 EDT 2017}
}
Web of Science
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