Instability structures during periods of large Richardson number (Ri > 14): Evidence of parametric instability
نویسندگان
چکیده
منابع مشابه
The instability of stratified flows at large Richardson numbers.
In contrast to conventional expectations based on the stability of steady shear flows, elementary time-periodic stratified flows that are unstable at arbitrarily large Richardson numbers are presented here. The fundamental instability is a parametric one with twice the period of the basic state. This instability spontaneously generates local shears on buoyancy time scales near a specific angle ...
متن کاملIndicators of Financial Instability
A global Slowdown, rising oil prices, and monetary tightening in industrial countries may lead to net capital outflows which accentuate high ratios of short-term to total external debt. This paper focuses on finding consistent indicators of financial instability. Knowledge of these indicators should assist attempts to implement institutional financial reform and improve an economy's resilien...
متن کاملNear-inertial parametric subharmonic instability
New analytic estimates of the rate at which parametric subharmonic instability (PSI) transfers energy to high-vertical-wavenumber near-inertial oscillations are presented. These results are obtained by a heuristic argument which provides insight into the physical mechanism of PSI, and also by a systematic application of the method of multiple time scales to the Boussinesq equations linearized a...
متن کاملInfluence of Hygrothermal Environment and FG Material on Natural Frequency and Parametric Instability of Plates
In this article, vibration characteristics and the parametric instability of functionally graded material (FGM) plates with cyclic loading in a hygrothermal field are discussed. The plate element is modeled in a finite element by applying the third-order shear deformation hypothesis. The mathematical formulation of the FGM plate is made with two material constituents by applying the power rule ...
متن کاملMultiscaling of noise-induced parametric instability.
We describe the statistical properties of growth rates of a linear oscillator driven by a parametric noise. We show that in general the fluctuations of local Lyapunov exponents are non-Gaussian and demonstrate multiscaling. Analytical calculations of the generalized Lyapunov exponents are complemented with approximative and numerical results; this allows us to identify the parameter range where...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Geophysical Research: Atmospheres
سال: 2013
ISSN: 2169-897X
DOI: 10.1002/jgrd.50514