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Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
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Variations of characteristic time scales in rotating stratified turbulence using a large parametric numerical study
D Rosenberg1,2, R Marino3,4, C Herbert5
1Oak Ridge National Laboratory, National Center for Computational Sciences, P.O. Box 2008, 37831, Oak Ridge, TN, USA.
The European Physical Journal. E, Soft Matter
|February 3, 2016
Summary
This study investigates rotating stratified turbulence (RST) using numerical simulations. Key findings reveal that energy partition between kinetic and potential modes significantly impacts time scales, especially in wave turbulence regimes.
Area of Science:
- Fluid dynamics
- Geophysics
- Atmospheric and oceanic sciences
Background:
- Rotating stratified turbulence (RST) is crucial for understanding geophysical flows.
- Previous studies often lacked comprehensive parametric analysis across key dimensionless numbers.
Purpose of the Study:
- To analyze characteristic time scales in RST across a wide range of parameters.
- To investigate the influence of energy partitioning between kinetic and potential modes on RST dynamics.
Main Methods:
- Numerical simulations of RST with 65 runs.
- Varying Reynolds (Re), Froude (Fr), and Rossby (Ro) numbers.
- Utilizing 1024(3) grids with periodic boundary conditions and no small-scale modeling or forcing.
Main Results:
- Buoyancy Reynolds number (RB) varied up to ≈10^5, simulating atmospheric/oceanic regimes.
- Neither rotation nor stratification ratio significantly impacted global dynamics without forcing.
- Characteristic times T(V) and T(P) varied with parameters, especially in wave turbulence.
- The ratio γ=T(V)/T(P) showed a bell-shaped curve with Richardson number (Ri), plateauing at ≈0.6 for strong turbulence.
Conclusions:
- Energy partition is key for modeling RST dynamics.
- Strong turbulence leads to destabilization and flow isotropization.
- Time scales are sensitive to parameter variations, particularly in wave turbulence regimes.
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