سال انتشار: ۱۳۹۰

محل انتشار: اولین کنفرانس بین المللی و سومین کنفرانس ملی سد و نیروگاههای برق آبی

تعداد صفحات: ۸

نویسنده(ها):

ARTEMIS MOTAMEDI – PhD student Dept of Water Engineering, Isfahan Univ of Technology, Isfahan
HOSSEIN AFZALIMEHR – Associate Professor Deptof Water Engineering, Isfahan Univof Technology, Isfahan
MAJID GALOIE – PhD student Graz University of Technology (TUGraz-Austria), Institute of Hydraulic Engineering and Water Resources Management
CLEMENS DORFMANN – PhD student Graz University of Technology (TUGraz-Austria), Institute of Hydraulic Engineering and Water Resources Management

چکیده:

On the basis of laboratory experiments, this paper presents the effect of different dune dimensions on flow separation. The present research assesses the quality of Reynolds- Averaged Navier-Stokes turbulence model for predicting the flow over twodimensional dunes. Three different dunes were developed with two lee-slope angles of 8° (Δ= ۴&6 cm) and 38° (Δ= ۸ cm).The length of the simulated separation zone was compared with experimental data. It is found that the numerical model provides a good overall consistency with the ADV measurements. Also the separation zone has a strong relation with the lee angle. At lee angles less than 10°, the shape of the crest or dune height has no effective impact on flow separation