A new atmospheric-like differentially heated rotating annulus configuration to study gravity wave emission from jets and fronts

Rodda, Costanza; Hien, Steffen; Achatz, Ulrich; Harlander, Uwe

doi:10.1007/s00348-019-2825-z

Cited by 16 publications

(21 citation statements)

References 47 publications

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“…1 that the wave trains have, indeed, horizontal wave vectors that tend to orient along the contraction axis, which is aligned with the jet, and occur in regions where the deformation is the largest. This investigation reveals that the IGWs emitted from the baroclinic flow in our experiment likely undergo wave capture during their propagation through the flow (Rodda 2019).…”

Section: Inertia-gravity Wavesmentioning

confidence: 64%

“…The vertical temperature difference D z T is used to calculate the buoyancy frequency N 5 (gaD z T/H) 1/2 , where g is gravity, a the thermal expansion coefficient, and H the total fluid depth. Our previous study (Rodda et al 2019) on the horizontal distribution of N in experiments with the same setup has shown the relevance of such distribution for the emission and propagation of gravity waves. Keeping in mind that the baroclinic wave slowly propagates with respect to the corotating temperature sensors, the spatial variation of N is well captured by the measured time dependency, which gives 0.15 , N , 0.30 rad s 21 .…”

Section: Experimental Setup and Data Acquisitionmentioning

confidence: 91%

“…The experiment used in this work is an atmosphericlike differentially heated rotating annulus for which inertia-gravity waves emitted from the baroclinic jet have been observed both numerically (Borchert et al 2014) and experimentally (Rodda et al 2019). A plexiglass tank subdivided into three concentric cylinders, with inner radius a 5 35 cm and outer radius b 5 70 cm, is mounted on a turntable and filled with deionized water.…”

Section: Experimental Setup and Data Acquisitionmentioning

confidence: 99%

“…For high enough rotation rates, the flow becomes baroclinically unstable and forms baroclinic waves. A more detailed description of the experiment and the flow regimes can be found in Rodda et al (2019).…”

Section: Experimental Setup and Data Acquisitionmentioning

confidence: 99%

“…On the contrary, measured atmospheric data contain all sources of IGWs and it is often challenging to separate their contributions. The differentially heated rotating annulus experiment, a well-established experiment to study an analog dynamics of the atmosphere (Read et al 2014), is used to generate baroclinic waves from which inertia-gravity waves are emitted (Hien et al 2018;Rodda et al 2018Rodda et al , 2019. The properties of the experimentally observed gravity waves are studied in detail together with the energy distribution among the balanced and imbalanced flow.…”

Section: Introductionmentioning

confidence: 99%

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Transition from Geostrophic Flows to Inertia–Gravity Waves in the Spectrum of a Differentially Heated Rotating Annulus Experiment

Rodda

Harlander

2020

Journal of the Atmospheric Sciences

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Inertia–gravity waves (IGWs) play an essential role in the terrestrial atmospheric dynamics as they can lead to energy and momentum flux when propagating upward. An open question is to what extent IGWs contribute to the total energy and to the flattening of the energy spectrum observed at the mesoscale. In this work, we present an experimental investigation of the energy distribution between the large-scale balanced flow and the small-scale imbalanced flow. Weakly nonlinear IGWs emitted from baroclinic jets are observed in the differentially heated rotating annulus experiment. Similar to the atmospheric spectra, the experimental kinetic energy spectra reveal the typical subdivision into two distinct regimes with slopes k−3 for the large scales and k−5/3 for the small scales. By separating the spectra into the vortex and wave components, it emerges that at the large-scale end of the mesoscale the gravity waves observed in the experiment cause a flattening of the spectra and provide most of the energy. At smaller scales, our data analysis suggests a transition toward a turbulent regime with a forward energy cascade up to where dissipation by diffusive processes occurs.

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Section: Inertia-gravity Wavesmentioning

confidence: 64%

Section: Experimental Setup and Data Acquisitionmentioning

confidence: 91%

Section: Experimental Setup and Data Acquisitionmentioning

confidence: 99%

Section: Experimental Setup and Data Acquisitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Transition from Geostrophic Flows to Inertia–Gravity Waves in the Spectrum of a Differentially Heated Rotating Annulus Experiment

Rodda

Harlander

2020

Journal of the Atmospheric Sciences

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Instabilities of thermocapillary-buoyant-Coriolis flow of medium Prandtl fluid in a slowly rotating annular pool

Lin

Shi

et al. 2022

International Communications in Heat and Mass Transfer

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Waves in the gas centrifuge: asymptotic theory and similarities with the atmosphere

Rodal

Schlutow

2021

J. Fluid Mech.

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We study the stratified gas in a rapidly rotating centrifuge as a model for the Earth's atmosphere. Based on methods of perturbation theory, it is shown that in certain regimes, internal waves in the gas centrifuge have the same dispersion relation to leading order as their atmospheric siblings. Assuming an air filled centrifuge with a radius of around 50 cm, the optimal rotational frequency for realistic atmosphere-like waves is around 10 000 revolutions per minute. Using gases of lower heat capacities at constant pressure, such as xenon, the rotational frequencies can be even halved to obtain the same results. Similar to the atmosphere, it is feasible in the gas centrifuge to generate a clear scale separation of wave frequencies and therefore phase speeds between acoustic waves and internal waves. In addition to the centrifugal force, the Coriolis force acts in the same plane. However, its influence on axially homogeneous internal waves appears only as a higher-order correction. We conclude that the gas centrifuge provides an unprecedented opportunity to investigate atmospheric internal waves experimentally with a compressible working fluid.

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A new atmospheric-like differentially heated rotating annulus configuration to study gravity wave emission from jets and fronts

Cited by 16 publications

References 47 publications

Transition from Geostrophic Flows to Inertia–Gravity Waves in the Spectrum of a Differentially Heated Rotating Annulus Experiment

Transition from Geostrophic Flows to Inertia–Gravity Waves in the Spectrum of a Differentially Heated Rotating Annulus Experiment

Instabilities of thermocapillary-buoyant-Coriolis flow of medium Prandtl fluid in a slowly rotating annular pool

Waves in the gas centrifuge: asymptotic theory and similarities with the atmosphere

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