An experimental apparatus for generating homogeneous isotropic turbulence

McCutchan, Aubrey L.; Johnson, Blair A.

doi:10.1007/s00348-023-03711-x

Cited by 6 publications

(2 citation statements)

References 31 publications

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“…In the papers presented herein, flows were either generated by natural convective processes or were produced by apparatus that forced flows by means of oscillating grids [161], rotating disks [160], rotating lids [65], oscillation of solid ice blocks [133], recirculating flumes [68,137,159], closed-loop water tunnels [124], and random jet arrays [162]. The characterization of the free or forced flows within these facilities is essential to sufficiently understand the affects of specific fluid conditions on ice melting rates and morphological evolution, and subsequent applicability to field conditions and models.…”

Section: Discussionmentioning

confidence: 99%

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Laboratory Experiments on Ice Melting: A Need for Understanding Dynamics at the Ice-Water Interface

McCutchan

Johnson

2022

JMSE

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The ice-ocean interface is a dynamic zone characterized by the transfer of heat, salinity, and energy. Complex thermodynamics and fluid dynamics drive fascinating physics as ice is formed and lost under variable conditions. Observations and data from polar regions have shed light on contributions that oceanic currents, meltwater plumes, subglacial hydrology, pressurized bubbles within glacier ice, and other features of the ice-ocean boundary region can make on melting and transport. However, the complicated interaction of mechanisms related to ice loss remain difficult to discern, necessitating laboratory experiments to explore fundamental features of melting dynamics via controlled testing with rigorous measurement techniques. Here, we put forward a review of literature on laboratory experiments that explore ice loss in response to free and forced convective flows, considering melting based on laminar or turbulent flow conditions, ice geometries representing a range of idealized scenarios to those modeling glaciers found in nature, and features such as salinity and stratification. We present successful measurement techniques and highlight findings useful to understanding polar ice dynamics, and we aim to identify future directions and needs for experimental research to complement ongoing field investigations and numerical simulations to ultimately improve predictions of ice loss in our current and evolving climate.

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Section: Discussionmentioning

confidence: 99%

“…Ref. [162] performed ice melting experiments in a facility where homogeneous isotropic turbulence with zero mean flows was generated. The turbulence was generated in the center of the tank using randomly actuated synthetic jet arrays [163] from four sides of the tank.…”

Section: Ice Spheresmentioning

confidence: 99%

Laboratory Experiments on Ice Melting: A Need for Understanding Dynamics at the Ice-Water Interface

McCutchan

Johnson

2022

JMSE

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Laboratory generation of zero-mean-flow homogeneous isotropic turbulence: non-grid approaches

Ghazi Nezami,

Byron,

Johnson

2023

Flow

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Over the years, many facilities have been developed to study turbulent flow in the laboratory. Homogeneous isotropic turbulence (HIT) with zero mean flow provides a unique environment for investigating fundamental aspects and specific applications of turbulent flow. We provide an extensive overview of laboratory facilities that generate incompressible zero-mean-flow HIT using different types of actuators and configurations. Reviewed facilities cover a variety of geometries and sizes, as well as forcing style (e.g. symmetric versus asymmetric and unsteady versus steady). We divide facilities into four categories, highlighting links between their geometries and the statistics of the flows they generate. We then compare published data to uncover similarities and differences among various turbulence-generation mechanisms. We also compare the decay of turbulence in zero-mean-flow facilities with that observed in wind and water tunnels, and we analyse the connections between flow characteristics and physical aspects of the facilities. Our results emphasize the importance of considering facility geometry and size together with the strength and type of actuators when studying zero-mean-flow HIT. Overall, we provide insight into how to optimally design and build laboratory facilities that generate zero-mean-flow HIT.

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Generation of nearly homogeneous isotropic turbulence using a novel oscillating grid system

Huang,

Lv,

Chen

et al. 2024

Physics of Fluids

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The creation and control of homogeneous isotropic turbulence in laboratory settings is of practical significance. In this paper, we propose a novel design for a turbulence generation apparatus driven by two pairs of oscillating grids, with the object of striking a balance between the stochastics of momentum injection and the flexibility of control of turbulent kinematic energy (TKE). To validate the performance of this system, tomographic particle image velocimetry measurements are conducted. Based on Reynolds decomposition, we characterize the secondary flow pattern and examine the impact of the mean velocity on the TKE transport. Analysis of one- and two-point statistics indicates that the generated turbulence exhibits reasonable approximations of homogeneity and isotropy. The TKE and the dissipation rate are linearly proportional to the grid oscillation frequency, with the Taylor-scale Reynolds number Reλ ranging from 47 to 154, suggesting a convenient control of turbulence with low-to-moderate intensity.

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An experimental apparatus for generating homogeneous isotropic turbulence

Cited by 6 publications

References 31 publications

Laboratory Experiments on Ice Melting: A Need for Understanding Dynamics at the Ice-Water Interface

Laboratory Experiments on Ice Melting: A Need for Understanding Dynamics at the Ice-Water Interface

Laboratory generation of zero-mean-flow homogeneous isotropic turbulence: non-grid approaches

Generation of nearly homogeneous isotropic turbulence using a novel oscillating grid system

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