Journal article
The effect of air–water interface on the vortex shedding from a vertical circular cylinder
Journal of fluids and structures, Vol.27(1), pp.1-22
2011
DOI: 10.1016/j.jfluidstructs.2010.09.001
Abstract
The flow past an interface piercing circular cylinder at the Reynolds number Re=2.7×10
4 and the Froude numbers Fr=0.2 and 0.8 is investigated using large-eddy simulation. A Lagrangian dynamic subgrid-scale model and a level set based sharp interface method are used for the spatially filtered turbulence closure and the air–water interface treatment, respectively. The mean interface elevation and the rms of interface fluctuations from the simulation are in excellent agreement with the available experimental data. The organized periodic vortex shedding observed in the deep flow is attenuated and replaced by small-scale vortices at the interface. The streamwise vorticity and the outward transverse velocity generated near the edge of the separated region, which enforces the separated shear layers to deviate from each other and restrains their interaction, are primarily responsible for the devitalization of the periodic vortex shedding at the interface. The lateral gradient of the difference between the vertical and transverse Reynolds normal stresses, increasing with the Froude number, is the main source of the streamwise vorticity and the outward transverse velocity at the interface.
Details
- Title: Subtitle
- The effect of air–water interface on the vortex shedding from a vertical circular cylinder
- Creators
- Jungsoo SuhJianming YangFrederick Stern
- Resource Type
- Journal article
- Publication Details
- Journal of fluids and structures, Vol.27(1), pp.1-22
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.jfluidstructs.2010.09.001
- ISSN
- 0889-9746
- eISSN
- 1095-8622
- Language
- English
- Date published
- 2011
- Academic Unit
- Mechanical Engineering; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984064207702771
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