Shear flow effects on the nonlinear evolution of thermal instabilities

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860682· OSTI ID:6275217

Leboeuf, J; Charlton, L A; Carreras, B A ^[1]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8070 (United States)

In the weak radiation drive regime, the coupling between the thermal instability driven by impurity radiation and the self-consistent flow profile modification leads to a simple dynamical system that can be approximated by the Volterra--Lotka equations. In this system the shear flow acts as a predator and the temperature fluctuations act as prey. The solutions are oscillatory, and their behavior resembles that of edge-localized modes (ELM's). The solutions of the simplified model are compared with the three-dimensional and two-dimensional nonlinear numerical results for this instability.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6275217
• Journal Information: Physics of Fluids B; (United States), Vol. 5:8; ISSN 0899-8221
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA INSTABILITY
PREDATOR-PREY INTERACTIONS
FLUCTUATIONS
TURBULENCE
INSTABILITY
VARIATIONS
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