عنوان مجله
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Civil Engineering Journal
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چکیده
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Design of water structures and their segments including spillways play an important role in water resources management
and agricultural activities. In the the linear body part of an ogee spillway, for speeding up the flow rate, the flow should be
transferred to the stilling basin by inverse curve so that the water energy can be reduced. This study aims to evaluate the
effect of the inverse profile curvature on the pressure of spillway surface using Fluent software. For this purpose, five
different curvatures of inverse profile were considered to be equal to no-curvature (zero), 1, 1.5, 2 and 2.5 of the spillway
design head. The results indicated that by increasing the curvature radius, the maximum pressure dramatically reduced.
And for this purpose, some relationships were given to predict the pressure reduction. Pressure increment in zero curvature
is caused by sudden collision of flow lines and turbulence caused by it. By increase in inverse profile curvature, the
turbulence is created in flow lines and the maximum pressure shows a lower value than before. In general, there was little
change in the average absolute pressure.
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