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The commercial CFD program STAR-CCM+ was used to compute the stage-discharge curve for the spillway of the Innerdalen Hydropower Dam in Norway. The spillway consisted of first a free overflow section and then a system of tunnels where the flow could be pressurized. Air entrainment and negative pressures caused the flow physics to be fairly complex. The computer program solved the Navier-Stokes equations with the k-epsilon and k-omega turbulence model. A volume of fluid method was used to determine the water surface location. Several types of non-orthogonal unstructured grids were tested. The...
In order to simulate heat producing elements on electronic circuits, heat input at the inlet of a rectangular duct is supposed to vary sinusoidally and transient forced convection for laminar flows are investigated numerically. This study focuses on a numerical and experimental analysis of unsteady forced convection in hydrodynamically developed and thermally developing laminar air flow in rectangular duct, subjected to periodic variation of the inlet temperature. The experiments are conducted on the range of Reynolds numbers of 1122, 1478, 1764 and 2225 for laminar flow and inlet frequencies...
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