supercritical flow


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supercritical flow

[¦sü·pər′krid·ə·kəl ′flō]
(hydrology)
(fluid mechanics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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In figure 4 are shown contours of temperature when different values of input and output pressure and opening of the valve, besides in case b) take place supercritical flow.
To reduce the length of pressurized reach, a long bottom outlet is normally divided into a pressurized portion controlled with a high head gate and an outlet tunnel that discharges a supercritical flow into the atmosphere [2].
The developed model features the incorporation of a secondary current effect by dispersion stresses [5], the reproduction of a convection-dominated or supercritical flow by a SU/PG test function [6], the adjustment of the internal wall velocity by the Navier-slip condition [4], and the imposition of skewed inflow velocity profiles by a beta function [7].
Those applications were a steady flow in a meandering channel with two curved sections: a propagating flow with cylindrical symmetry of an advancing front, an internal recirculating flow with corner eddies generated by the motion of one of the containing walls, and a supercritical flow accompanying an abruptly increased flow depth evolved by an oblique standing wave.
The test problems in Table 1 include (1) a bend flow in a curved channel, (2) a discontinuity propagation evolved by the breaking of a circular cylinder, (3) an intercirculating flow formed in a side cavity, (4) a supercritical flow in a channel with a deflected wall or converging sides, (5) a combining flow in an open-channel junction, (6) an unsteady fluid motion past a bluff body in an oscillating fashion, (7) a flow over uneven bottom or flow passing through a nonprismatic channel, (8) a dam-break type flow with discontinuous initial condition, and (9) an implementation of a moving boundary scheme to capture the transition of wet and dry elements.
The method introduces proper amount of artificial diffusion only in the flow direction, thereby providing stable and accurate results under a convection-dominated or supercritical flow condition.
In supercritical flow, kinetic energy is converted to potential energy as it moves over a barrier, decelerating on the upwind side and accelerating on the downwind side.
They characterise the periodicity of the separation of vortices at supercritical flow over cylinders.
Both methods had limitations when applied to junctions with plunging inflow or with outflow pipes that carry supercritical flow. In addition, both methods are relatively complex and necessitate solutions that may require repeating over time.
The result is a new method, which is somewhat simpler than the existing methods and might improve handling of plunging flow and supercritical flow situations.
The FHWA lab performed 18 runs in the small-scale experiments, with supercritical flow in the outflow pipe and two inflow pipe configurations at 180 degrees and 90 degrees.