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Showing 1 to 20 of 38 for “"free surface flow"”.
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Free surface flow over bottom topography
This thesis explores flow in a channel over a bottom topography. In particular, the problem of finding the shape of the unknown free-surface if the bottom topography is prescribed forms the main problem of this thesis. In chapter 2 the forced Korteweg De- Vries equation is derived from first …
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Free surface flow over a wavy bed.
Massachusetts Institute of Technology, Dept. of Civil Engineering, Thesis. 1965. M.S.
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Mechanics of Sandbag Motion In Free-Surface Flow
… of the motion of sandbags in open-channel flow is complex since the sandbag shape varies from a very flat hump to spherical, sandbags may be porous and permeable, and the water content of the sandbag may vary from being totally dry to almost fully saturated.</p> <p>The research reported in …
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Photoelastic study of dense granular free-surface flow rheology and size segregation
… individual particles within the bulk of 2D flows are quantified. The specific type of granular flow we study is gravity-driven, dry, and in the slow to intermediate regime. Here we describe a novel adaptation of the photoelastic technique and explain how we applied it in an original setup to …
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Free surface flow and application to the filling and solidification of liquid metals into vessels of arbitrary shape
… by waves and the breaking of the molten metal surface during filling must be avoided. Otherwise, substandard casting products will result which cost the foundry industry millions of pounds in lost revenue. A three-dimensional control-volume, free surface flow technique known as the Scalar …
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Flow Imaging of the Fluid Mechanics of Multilayer Slide Coating. Flow visualisation of layers formation in a 3-layers slide coating die, measurement of their thicknesses and interfacial and free surface flow instabilities
… the physical properties of the coating fluids), flow instabilities may arise at the interfaces between the layers and on the top layer. These instabilities ruin the application of the final multi-layered coating and must be avoided. This research addresses this coating flow situation and seeks to …
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Rain Induced Runoff Simulation Using A 2D Numerical Model
… in the agricultural and urbanized environments. Surface runoff is determined primarily by the amount of precipitation and by infiltration characteristics related to soil type, soil moisture, antecedent rainfall, land cover type, impervious surfaces, and surface retention. In this study, CCHE2D, a …
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Dynamic Analysis of an Inflatable Dam Subjected to a Flood
… dam where it can operate without rupture, or overflow. A fully nonlinear free-surface flow was applied in two dimensions using a mixed Eulerian-Lagrangian formulation. An ABAQUS finite element model was used to determine the dynamic structural response of the dam. The problem was solved in the …
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Aplicabilidade dos métodos de determinação de perfis da superfície livre em escoamentos através de condutos circulares
… initially, presents some qualitative aspects of free surface flow through circular conduits. Following, some methods for determination of longitudinal profiles of the water surface to gradually varied flow are described. These methods are the Direct Step, Keifer and Chu, Keifer and Chu modified, …
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Gas forces during the rapid opening of disc valves
… supplement existing steady state or continuous flow analysis as outlined by Wambsganss, MacLaren etc. The study describes tests carried out on disc valves in which the valve seat was withdrawn from the valve while a pressure difference existed across the valve. Simultaneous measurements were …
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Accelerating a Coupled SPH-FEM Solver through Heterogeneous Computing for use in Fluid-Structure Interaction Problems
… presents a partitioned approach to simulating free-surface flow interaction with hyper-elastic structures in which a smoothed particle hydrodynamics (SPH) solver is coupled with a finite-element (FEM) solver. SPH is a mesh-free, Lagrangian numerical technique frequently employed to study …
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A WC-MPS Model for Viscous Free Surface Flows
… decades, but they will fail in the simulation of free surface flow problems due to the large deformation and fragmentation, and they suffer from some problems whose objects are a set of discrete physical particles (rather than a continuum). On the contrary, mesh-less particle methods (MPMs), or …
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Percolação em barragens de terra em regime permanente e transiente com o método dos elementos de contorno
… process through an earth dam. The transient free surface flow during the fill-up and drawdown phases of a reservoir is of utmost importance in the analysis of embankment stability and to compute the internal drainage devices. A boundary element procedure for dealing with steady and unsteady …
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Roll stabilization for fast monohulls by using passive and active lifting appendages
… program, was used for the analysis of the linear free-surface flow around the vessel. Simulations were carried out in regular waves incident at angles ranging from 90⁰, 105⁰,120⁰,135⁰ and 150⁰ degrees relative to the ship axis, 900 being beam waves and 180⁰ degree being head waves. The ship was …
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A numerical simulation of two-dimensional separated flow in a symmetric open-channel expansion using the depth-integrated two-equation (K-E) turbulence closure model
Many of the free surface flow problems encountered by hydraulic engineers can be suitably analyzed by means of the depth-integrated equations of motion. A consequence of adopting a depth-integrated modeling approach is that closure approximations must be implemented to represent the so-called …
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Numerical analysis of subcritical open channel flow by the penalty function finite element method
Many free surface flow problems encountered in hydraulic engineering can be accurately analyzed by utilizing the depth-averaged equations of motion. A consequence of adopting this depth-averaged modeling approach is that closure approximations must be implemented to represent the so-called …
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Design of an endoscopic 3-D Particle-Tracking Velocimetry system and its application in flow measurements within a gravel layer
In this thesis a novel method for 3-D flow measurements within a permeable gravel layer is developed. Two fiberoptic endoscopes are used in a stereoscopic arrangement to acquire image sequences of the flow field within a single gravel pore. The images are processed by a 3-D Particle-Tracking …
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SPH Simulation of Fluid-Structure Interaction Problems with Application to Hovercraft
… et al., 2008). The first test case is flow in a sloshing tank interacting with an elastic body and the second one is dam-break flow through an elastic gate. The results obtained with the SPH-FEM model show good agreement with published results and suggest that the SPH-FEM model is a …
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PRESSURE DRIVEN WALL JET FLOW NEAR CHANNEL EXIT AT MODERATE REYNOLDS NUMBER
The wall jet flow driven by a pressure gradient near channel exit at Reynolds Number ranging from the order of 10 to 100, emerging from a two-dimensional channel is examined theoretically in this study. Poiseuille flow conditions are assumed to prevail far upstream from the exit. The problem is …
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