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http://hdl.handle.net/11375/16835
Title: | Suppression of three-dimensional flow instabilities in tube bundles |
Authors: | Kevlahan, N.K.-R. Wadsley, J. |
Keywords: | Fluid-structure interaction;Instability;Tube bundle |
Publication Date: | 17-May-2005 |
Publisher: | Elsevier |
Citation: | Kevlahan, N.K.-R. & Wadsley, J. 2005 Suppression of three-dimensional flow instabilities in tube bundles. J. Fluids Strucs. 20(4), 611-620. |
Series/Report no.: | J. Fluids Strucs.; |
Abstract: | We study the generation of three-dimensional vorticity in tightly packed tube bundles. In particular, our goal is to investigate which conditions (if any) enable the flow to remain two-dimensional for Re4180. We calculated two- and three-dimensional flow through periodic rotated square tube bundles with tight packing, P=D 1⁄4 1:5, using a high resolution pseudo-spectral code with penalization. The tubes are cylinders whose response is modelled as a rigid harmonic oscillator forced by the flow-induced lift. We find that at Re 1⁄4 200 tube motion completely suppresses the three-dimensional instability. At Re 1⁄4 1000 tube motion does not suppress the three-dimensional instability, although the flow does have increased spanwise correlation and the Strouhal number for the two- and three-dimensional flows is approximately the same. The tight packing alone does not suppress the three-dimensional instability. Three- dimensional vorticity drastically reduces fluid forces acting on the tube compared with an equivalent two-dimensional flow. |
URI: | http://hdl.handle.net/11375/16835 |
Identifier: | doi:10.1016/j.jfluidstructs.2005.02.010 |
Appears in Collections: | Mathematics & Statistics Publications |
Files in This Item:
File | Description | Size | Format | |
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3d_instability.pdf | Main article | 1.14 MB | Adobe PDF | View/Open |
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