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Showing 1 to 20 of 86 for “"Froude number"”.
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Cavity and projectile dynamics in intermediate Froude number water entry
Introduction: Water entry of projectiles has long been a topics of interest in both sciences and engineering. It began with Worthington, who in the late XIX century found experimentally that a cavity is being formed when a steel sphere enters water (Worthington and Cole (1895-1896)). As we know …
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Free Surface Penetration of Inverted Right Circular Cones at Low Froude Number
In this thesis the impact of inverted cones on a liquid surface is studied. It is known that with the right combination of velocity, geometry, and surface treatment, a cavity of air can be formed behind an impacting body and extended for a considerable distance. Other investigators have shown that …
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Structures, statistics and mechanisms of low Froude number free-surface turbulence : a simulation-based study
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, February 2001.
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JEMEZ RIVER CASE STUDY: UTILIZING A FROUDE NUMBER SIMILITUDE PHYSICAL MODEL, 1-D MOBILE BED NUMERICAL MODEL, AND A 2-D FIXED BED NUMERICAL MODEL FOR WEIR DESIGN INSIGHT
… of a physical mobile bed model based on Froude Similitude to model scour patterns downstream of the Jemez Weir. This research takes the investigation one step further through the development and testing of a two-dimensional fixed bed model using the Bureau of Reclamations Sedimentation …
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Bedform and Flow Relationships, Little Missouri River Near Medora, North Dakota
… Three relationships (velocity: depth, Reynolds number: Froude number, Reynolds number: median grain size of sand) were moderately successful in separating ripples from dunes but failed to isolate plane bed. The use of velocity near the bed to calculate the Froude number results in a relatively …
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Incipient Motion Under Shallow Flow Conditions
… the effect of low relative depth and high Froude number on the dimensionless critical shear stress (Shields parameter). Spherical particles of four different densities and an 8mm diameter were used as movable test material. The relative depth ranged from 2 to 12 and the Froude number ranged …
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An experimental study of Worthington jet formation after impact of solid spheres
… maximum heights of each jet are compared to the Froude number at impact. The maximum height of the second jet is found to scale linearly with We, which is calculated using the velocity of the jet tip rather than impact velocity. Viscosity is shown to be negligible while a dependence on gravity is …
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Dynamic Analysis of an Inflatable Dam Subjected to a Flood
… the time domain which allows the prediction of a number of transient phenomena such as the generation of upstream advancing waves, and dynamic structural collapse. Stresses in the dam material were monitored to determine when rupture occurs. An iterative study was performed to find the service …
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Hydrodynamic Drag and Flow Visualization of IsoTruss Lattice Structures
… the water velocities corresponded to a Reynolds number range of 7,000 to 80,000. Based on the average member diameter, the corresponding Reynolds number spanned from 600 to 3,000. In addition, the height variation drag tests were performed by vertically extracting the IsoTruss® test specimens …
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Development, Evaluation and Improvement of Correlations for Interphase Friction in Gas-Liquid Vertical Upflow
… friction force as a function of the Weber number, the Froude number and the mixture Froude number. Statistical analysis of the three correlations shows that the mixture Froude number correlation should be the most accurate correlation. The correlations have a weakness that makes them …
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Experimental Investigation of Steady Flows at a Breached Levee
… surface elevation are presented. In addition, Froude Number, turbulent kinetic energy (TKE) and bed shear stress are computed from the measured results. Results show that the flow is one-dimensional near the inlet and outlet of the main channel. However, it is three-dimensional near the breach. …
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Two phase flow splitting in piping branches
… The factors examined were tripod orientation, Froude number, void fraction, and swirl induced by helical grooves in the tube supplying the two-phase flow to the tripod. The flow regime of concern is primarily annular. Experiments were run and data was collected and analyzed. The two piece …
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Lateral outflow from supercritical channels
… of water, with 97.8% being the lowest at a Froude number of 2.71 and velocity of 2.97 ft/s (0.905 m/s), with little to no negative hydraulic effects to channel flow. A uniform and tapered vane structure at different vane angles, 35°, 40° and 45°, was added to the different pipe angles to …
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The Effects of Basin Slope and Boundary Friction on the Character and Plunge Location of Hyperpycnal Flows Entering a Laterally Unbounded Basin
… flows plunge when the flow reaches a densimetric Froude number of unity. This study attempts to find the densimetric Froude number at hyperpycnal plunging in a three dimensional domain and if it is influenced by the factors that also influence the spread. This study also analyzes whether the …
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Extended Momentum Model for Single and Multiple Hydrokinetic Turbines in Subcritical Flows
… flows. The new model includes blockage ratio and Froude number as independent variables, which are inferred in advance to yield a single solution in the prescribed domain. The theoretical extension is integrated with the Blade Element Theory in a Double Multiple Streamtube model (DMS) to predict …
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A computer model for circular and linear bubble plumes
… in the data likely result from the fact that the Froude number used in the model to calculate initial velocity was derived for a circular, rather than a linear, source. Determination of the appropriate linear Froude number would likely improve the model’s predictions.
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The Structure and Intensity of Winter Mesoscale Lake -Effect Circulations Associated With an Isolated Lake
… index was found to be equivalent to scaling the Froude number by a dimensionless quantity comprised of lake-air temperature difference, fetch distance, air temperature, and boundary layer height to improve its predictive capability. The intensity index: (1) accounts for the relative contributions …
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Free surface flow over bottom topography
… 3 flow over bottom topography at critical Froude number (when F = 1) is examined. For large amplitude negative Gaussian forcing, asymptotic solutions are constructed using boundary layer theory; one point of interest here is an internal layer away from the origin which mediates a change …
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Scaling Effects on the Hydrodynamics and Performance of Current Turbines
… the effects of the blockage ratio, Reynolds number, and Froude number on turbine performance and flow dynamics with the goals of better understanding the relative influence of these parameters and improving the quality of laboratory-scale testing. The second objective is to assess several …
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Rotating gravity current and channel flows
… the energy loss theory predicts that the Froude number tends to 2* irrespective of the rotation rate. For deeper currents the Froude number increases with rotation. The second extension to the energy conserving theory is the inclusion of an upstream potential vorticity boundary conditionin …
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