Monopoles in a zonal flow with constant shear on a quasi-geostrophic f-plane: Effects of Galilean non-invariance

2021 ◽  
Vol 33 (11) ◽  
pp. 116606
Author(s):  
Gregory Reznik ◽  
Sergey Kravtsov
Keyword(s):  
Zonal Flow ◽  
Constant Shear

scholarly journals Planetary, Inertia‐Gravity and Kelvin waves on the f ‐plane and β ‐plane in the presence of a uniform zonal flow

2021 ◽  
Author(s):  
Yair De‐Leon ◽  
Itzhak Fouxon ◽  
Chaim I. Garfinkel ◽  
Nathan Paldor
Keyword(s):  
Zonal Flow ◽  
Kelvin Waves

scholarly journals Low-cost Solutions for Velocimetry in Rotating and Opaque Fluid Experiments using Ultrasonic Time of Flight

2021 ◽  
Author(s):  
Fabian Burmann ◽  
Jerome Noir ◽  
Stefan Beetschen ◽  
Andrew Jackson
Keyword(s):  
Acoustic Waves ◽  
Flow Measurement ◽  
Low Cost ◽  
Time Of Flight ◽  
Zonal Flow ◽  
Gravitational Acceleration ◽  
Complex Flow ◽  
Ultrasonic Time ◽  
Theoretical Predictions ◽  
Complex Flow Structure

AbstractMany common techniques for flow measurement, such as Particle Image Velocimetry (PIV) or Ultrasonic Doppler Velocimetry (UDV), rely on the presence of reflectors in the fluid. These methods fail to operate when e.g centrifugal or gravitational acceleration leads to a rarefaction of scatterers in the fluid, as for instance in rapidly rotating experiments. In this article we present two low-cost implementations for flow measurement based on the transit time (or Time of Flight) of acoustic waves, that do not require the presence of scatterers in the fluid. We compare our two implementations against UDV in a well controlled experiment with a simple oscillating flow and show we can achieve measurements in the sub-centimeter per second velocity range with an accuracy of $\sim 5-10\%$ ∼ 5 − 10 % . We also perform measurements in a rotating experiment with a complex flow structure from which we extract the mean zonal flow, which is in good agreement with theoretical predictions.

scholarly journals Wave-kinetic approach to zonal-flow dynamics: Recent advances

2021 ◽  
Vol 28 (3) ◽  
pp. 032303
Author(s):  
Hongxuan Zhu ◽  
I. Y. Dodin
Keyword(s):  
Zonal Flow ◽  
Flow Dynamics ◽  
Kinetic Approach ◽  
Recent Advances

Modeling the Behavior of Crystallizable Shape Memory Polymers Subject to Inhomogeneous Deformations

2010 ◽  
Author(s):  
Mahesh Khanolkar ◽  
Jaskirat Sodhi ◽  
I. Joga Rao
Keyword(s):  
Constitutive Model ◽  
Shape Memory ◽  
Research Work ◽  
Shape Memory Polymers ◽  
Inhomogeneous Deformation ◽  
The Past ◽  
Constant Shear ◽  
Multiple Natural Configurations ◽  
Constant Moment

The constitutive model for the mechanics of crystallizable shape memory polymers (CSMP) has been developed in the past [1, 2]. The model was developed using the theory of multiple natural configurations and has been successful in addressing a diverse class of problems. In this research work, the efficacy of the developed CSMP model is tested by applying it to the torsion of a cylinder, which is an inhomogeneous deformation. The crystallization of the cylinder is studied under two different conditions i.e. crystallization under constant shear and crystallization under constant moment.

scholarly journals An Exact Modon Solution in a Parabolically Sheared Zonal Flow

1994 ◽  
Vol 72 (5) ◽  
pp. 773-776 ◽  
Author(s):  
Hirotada Kanehisa
Keyword(s):  
Zonal Flow

Fluid simulation of tokamak ion temperature gradient turbulence with zonal flow closure model

2016 ◽  
Vol 23 (3) ◽  
pp. 032305 ◽  
Author(s):  
Osamu Yamagishi ◽  
Hideo Sugama
Keyword(s):  
Temperature Gradient ◽  
Zonal Flow ◽  
Fluid Simulation ◽  
Ion Temperature ◽  
Closure Model ◽  
Ion Temperature Gradient ◽  
Flow Closure

scholarly journals Vortex–Vortex Interactions for the Maintenance of Blocking. Part II: Numerical Experiments

2013 ◽  
Vol 70 (3) ◽  
pp. 743-766 ◽  
Author(s):  
Akira Yamazaki ◽  
Hisanori Itoh
Keyword(s):  
Numerical Experiments ◽  
Channel Model ◽  
Spherical Model ◽  
Zonal Flow ◽  
Selective Absorption ◽  
Absorption Mechanism ◽  
Vortex Interactions ◽  
Maintenance Mechanism ◽  
Uniform Background

Abstract The selective absorption mechanism (SAM), newly proposed in Part I of this study on the maintenance mechanism of blocking, is verified through numerical experiments. The experiments were based on the nonlinear equivalent-barotropic potential vorticity equation, with varying conditions with respect to the shape and amplitude of blocking, and characteristics of storm tracks (displacement and strength) and background zonal flow. The experiments indicate that the SAM effectively maintains blocking, irrespective of the above conditions. At first, by applying a channel model on a β plane, numerical experiments were conducted using a uniform background westerly with and without a jet. The results show that the presence of a jet promotes the effectiveness of the SAM. Then, two types of spherical model experiments were also performed. In idealized experiments, the SAM was as effective as the β-plane model in explaining the maintenance of blocking. Moreover, experiments performed under realistic meteorological conditions showed that the SAM maintained a real block, demonstrating that the SAM is effective. These results, and the case study in Part I, verify that the SAM is the effective general maintenance mechanism for blocking.

scholarly journals Erratum: “Zonal flow in a tokamak pedestal” [Phys. Plasmas 16, 056105 (2009)]

2009 ◽  
Vol 16 (9) ◽  
pp. 099902 ◽  
Author(s):  
Grigory Kagan ◽  
Peter J. Catto
Keyword(s):  
Zonal Flow
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