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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Comparison of the k-epsilon and k-omega turbulence models
Comparison of the k-epsilon and k-omega turbulence models
In this contribution the performance of the standard k-ε turbulent closure is compared with the k-ω model in two simulation
settings: (i) a racetrack flume with a semi-trapezoidal cross-section in a hydraulic laboratory; (ii) a reach of 2.5 km length at
the Danube River in Austria, characterized by several groyne fields and a relatively complex morphological setting.
From the simulation results of the laboratory flume it was found that the k-ω model predicts steeper velocity gradients and
more elliptically shaped recirculation zones, as compared to the k-ε model. These results of the k-ω turbulent closure
locally indeed correspond more closely to measurements, though there exist regions of the flow domain in which the k-ε
model yields superior results. In a simulation of a reach of the Danube River, the differences between the models were
substantially smaller but nonetheless visible in the flow field. In this setting, the k-ω model exhibited a tendency to
smoothen extremes in flow velocities, while differences in the gyres developing in the groyne fields could not be detected.
This finding is credited to the complex boundary conditions in nature influencing the flow field to a larger extent than the
plain effect of turbulence.
File Size : 1,480,619 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 18/08/2015
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