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Published on: July 19, 2016
Effects of forcing geometry on two-dimensional weak turbulence
Yang Liao1, Douglas H Kelley, Nicholas T Ouellette
1Department of Mechanical Engineering & Materials Science, Yale University, New Haven, Connecticut 06520, USA.
Summary
The forcing geometry in electromagnetically stirred thin-layer flows significantly impacts flow statistics. Vortex-based forcing enhances kinetic energy, while shear-band forcing intensifies velocity gradients, crucial for 2D flow experiment design.
Area of Science:
- Fluid dynamics
- Experimental physics
Background:
- Electromagnetic stirring is used to generate complex fluid flows.
- Understanding flow statistics is key to controlling and predicting fluid behavior.
Purpose of the Study:
- To investigate how different forcing geometries affect the statistics of electromagnetically stirred thin-layer flows.
- To compare the impact of vortex-lattice and shear-band forcing.
Main Methods:
- High-resolution particle tracking velocimetry (PTV) was employed.
- Two distinct forcing geometries were implemented: a vortex-lattice and a shear-band array.
Main Results:
- The vortex-lattice flow generated higher fluctuating kinetic energy.
- The shear-band flow resulted in more intense fluctuating velocity gradients.
- Energy spectra analysis explained the observed differences.
Conclusions:
- Forcing geometry is a critical parameter in controlling flow statistics in electromagnetic stirring.
- Results provide insights for optimizing two-dimensional flow experiment designs.
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