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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : Comparison of Reynolds-Averaged Navier-Stokes Turbulence Models under Condition of Oscillatory Bound...
Comparison of Reynolds-Averaged Navier-Stokes Turbulence Models under Condition of Oscillatory Boundary Layer Flow
Author : Minwoo Son, Kwansue Jung, Sang Ug Kim and Eun-Sung Chung
This study aims to compare Reynolds-averaged Navier-Stokes equations (RANS) turbulence models (k-e and k-? models) under the condition of oscillatory boundary layer flow at high Reynolds number. For the condition of negligible spanwise flow (y-direction in this study), the U-tube experiment is replicated by a one-dimensional vertical (1DV) numerical model. The most reliable conclusion of this study is that a k-e model and a k-? model calculate very similar flow condition and turbulent kinetic energy (TKE). This finding is different from previous study. Puleo et al. (2004) also applied a 1DV model incorporated with k-e and k-? models to U-tube experiment and calculated TKE. They concluded that the result of k-? model is more accurate than that of k-e model. From Wilcox (1993), it is known that a k-? model has an advantage over k-e model under the condition of large spanwise pressure gradient. As mentioned, spanwise flow of U-tube experiment is assumed to be negligible. Therefore, it is questionable that the result of k-e model has less accuracy compared to the result of k-? model. Pope (2000) insisted that a k-? model is sensitive to calibration of empirical parameters. Based on results of this study and Pope (2000), it is concluded that a k-e model does not a disadvantage compared to k-? model under the condition of negligible spanwise flow. Therefore, it is also concluded that a k-e model has a capability to calculate turbulent flow and TKE when studying cases such as straight channel flow, estuarine flow and oscillatory flow of which spanwise (or along-shelf) pressure gradient is not significantly large.
File Size : 878,424 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Article : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT
Date Published : 18/07/2016
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