Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Virtual Mass"”.
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Determination of the virtual mass of the Akron due to the potential flow of air about it
Thesis: B.S., Massachusetts Institute of Technology, Department of Aeronautical Engineering, 1932
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Numerical Simulation of Turbulent Particle Diffusion
… to include effects of particle inertia and virtual mass to enable simulation for a wide range of Stokes numbers. The CRW results with the finite Stokes incremental drift velocity and the modified Markov chain agreed well the DNS results for long-time diffusion once effects of anisotropy in …
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Analysis of interfacial forces on the physics of two-phase flow and hyperbolicity of the two-fluid model
… forces: the interfacial pressure and the virtual mass. We will quantify the minimum correction that is necessary to ensure hyperbolicity of the two-fluid model. We will then compare the two forces and combine them into an aggregated correction. This correction is proposed for use as a …
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A study of turbulent flow with the effect of vegetation
… on the interaction with individual cylinders. Virtual mass force exerting on flow by vegetation is introduced into governing equations so that not only steady but also unsteady turbulent flow can be solved. Based on the proposed governing equations, a numerical model, called 3D I?-coordinate …
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Numerical Modeling of Air-Water Flows in Bubble Columns and Airlift Reactors
… drag model was employed along with virtual mass and the standard k-e turbulence model. The equations were discretized using the QUICK scheme and solved with the SIMPLE coupling algorithm. The flow regimes of a bubble column were investigated by varying the column diameter and the …
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Energetics of Turbulence Explains Physical Transport Processes in the Environment
… history term) and the displacement of water mass due to grain movement (virtual mass term). The inclusion of these terms addresses inconsistencies between resent laboratory experiments and previous theories on grain settling velocities in turbulence where density contrasts between water and …
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PERFORMANCE ANALYSIS AND THE EFFECTS OF KEY PARAMETERS IN SOLID PARTICLE BEDS
… collision, particle-wall interaction, and virtual mass force which initiates from particle motion influencing neighboring particles make it very difficult to analyze the problem experimentally and numerically. This work is focused on assessing the performance of the existing numerical …
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Mechanical Control of Sensory Hair-Bundle Function
… the loads—constant force, load stiffness, virtual drag, and virtual mass—imposed on a hair bundle. Upon changes in these mechanical parameters, the bundle's response characteristics alter. Subjected to particular control parameters, a bundle may oscillate spontaneously or remain quiescent. …
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ECoG correlates of visuomotor transformation, neural plasticity, and application to a force-based brain computer interface
… was recast once again to control the force on a virtual cursor in a novel "mass-grab" task. This task required targets not only to reach to peripheral targets but also account for an additional virtual mass as they "grabbed" each target and moved it to a second target location in the presence of …
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Unsteady Aerodynamics of Wing-Gust Encounters
… transverse to the lifting surfaces can cause massive changes to the angle of incidence, fluctuations in lift and drag, and result in flight instability. This may be catastrophic for small drones, and hazardous for larger aircraft during take-off and landing. Onboard gust sensing and …
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Computational fluid dynamics and experimental study of the hydrodynamics of a bubble column and an air-water jet-stirred cell
… data was found, provided that the drag, lift and virtual mass forces were taken into account. In the third part a preliminary experimental study, carried out in a rectangular flat cell, was presented. It was carried out to investigate the size distribution of bubbles generated by a moderate …
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Wind loading and dynamic response of air-supported roof structures
… For this case the internal air and added mass effects become dominant. Explicit dynamic analysis using a centred finite difference scheme is employed in Chapter 9 to analyse the response of pneumatic structures; and in particular to assess the response of the test structures. The influence …