Temat: averaged model - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wave transformation in a multi-bar surf zone: case study of Lubiatowo (Poland)
Autorzy:: Lan, Y. J.
Hsu, T. W.
Ostrowski, R.
Szmytkiewicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/241174.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: wave transformation
wave energy dissipation
wave breaking
multi-bar cross-shore profile
phase-averaged model
hydraulic jump model
Opis:: The paper presents results of field and theoretical investigations of wave transformation in the surf zone near the IBW PAN Coastal Research Station in Lubiatowo (Poland, the south Baltic Sea). The study site displays multi-bar cross-shore profiles that intensively dissipate wave energy, mostly induced by breaking. The main field data comprise wave heights and cross-shore bathymetric profiles. Wave transformation is modelled theoretically by two approaches, namely the IBW PAN phase-averaged wave transformation model and the approach based on the hydraulic jump model, developed by Hsu & Lai (2009) for hydrological situations encountered under the actual conditions of two field campaigns – in 1987 and 1996. Discrepancies between the measured data and the model results are discussed. In general, the model results are in good agreement with the in-situ observations. The comparison of the field data with the computational results concerns a part of the surf zone between about 5 m water depth and the first nearshore stable bar, where the depth amounts to ca. 1.2 m.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2016, 63, 1; 19-34
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Comparison of five depth-averaged 2-d turbulence models for river flows
Autorzy:: Wu, W.
Wang, P.
Chiba, N.
Powiązania:: https://bibliotekanauki.pl/articles/241492.pdf
Data publikacji:: 2004
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: turbulence model
depth-averaged two-dimensional model
river flow
zero-equation turbulence model
k-e turbulence model
Opis:: In this study, five depth-averaged 2-D turbulence models for river flows, including the depth-averaged parabolic eddy viscosity model, modified mixing length model, standard k-e turbulence model, non-equilibrium k-e turbulence model and re-normalized group (RNG) k-e turbulence model, are compared in the simulation of flows around a spur-dyke, in a sudden-expanded flume and in two natural rivers. It is shown that in the two field cases where the channel geometries are simple, all five models can give generally good predictions for the main flow features. However, in the two laboratory cases where the channel geometries are complex, differences have been found among these models. The depth-averaged parabolic eddy viscosity model over-predicts the recirculation flows behind the spur-dyke and the flume expansion. The modified mixing length model gives better prediction than the depth-averaged parabolic model. The standard k-e turbulence model predicts well for the recirculation flow in the sudden-expended flume, but under-predicts the length of recirculation zone behind the spur-dyke, while the non-equilibrium and RNG k-e turbulence models provide good results for both laboratory cases.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2004, 51, 2; 183-200
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

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