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 20 of 42 for “"isotropic turbulence"”.
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Direct numerical simulation of droplet-laden isotropic turbulence
Interaction of liquid droplets with turbulence is important in numerous applications ranging from rain formation to oil spills to spray combustion. The physical mechanisms of droplet-turbulence interaction are largely unknown, especially when compared to that of solid particles. Compared to solid …
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Particle ejection and suspension due to isotropic turbulence
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1993.
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Toward a Theory of Homogeneous, Isotropic Turbulence of Incompressible Fluids
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2012-02-27T21:15:16Z No. of bitstreams: 1 1971_nakano.pdf: 4067448 bytes, checksum: d794ce2ec32b3ac96c8660b08b8e878a (MD5)
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Particle dispersion in isotropic turbulence and unsteady particle dynamics at finite Reynolds number
A solution to particle dispersion in an isotropic turbulence under Stokes drag, Basset force and gravitational force is obtained in closed form using the independence approximation. The Basset force has no effect on the fluid velocity structure seen by the particles or the long-time particle …
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Characteristics of flame-turbulence interactions in freely propagating turbulent premixed flames under decaying and forced isotropic turbulence conditions
… utilized either forced or decaying background isotropic turbulence to provide detailed insights into the features of flame-turbulence interactions; however, none have made direct comparisons of cases where the turbulence decays or is sustained using a forcing strategy. This study compares the …
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Numerical Simulations of Two -Way Coupling Effects in a Particle-Laden Turbulent Pipe Flow, And, Evaluation of the Equilibrium Eulerian Approach for the Evolution of Particle Concentration in Isotropic Turbulence
… concentration and settling velocity in isotropic turbulence. The equilibrium Eulerian approach is extended to evolve the particle concentration for varying particle response time and still-fluid settling velocity. Over the entire range of particle parameters considered, there is good …
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Statistische Analyse der atmosphärischen Turbulenz und allgemeiner stochastischer Prozesse
… to a proper characterization of atmospheric turbulence. Being an outstanding problem, the markedly intermittent statistics of velocity differences - the velocity increments - will be examined and their relevance in view of estimating extreme events will be discussed. Considering the …
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DNS Study of Flow Over Periodic and Random Distribution of Cylinders and Spheres
… DNS study of interactions between isotropic turbulence and finite sized spheres address the bi-directional influence in the regime of particle size much larger than the Kolmogorov scale.
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Interaction Between a Spherical Particle and Wall -Bounded Flows at Finite Reynolds Number
… channel center can be considered as nearly isotropic turbulence. We compare the computed forces with the standard force formulations and analyze possible mechanisms for their deviations. Further, we analyze the back effects that the particle imposes on the turbulence field---in particular, …
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Toward Ideal Large-Eddy Simulation
… subgrid model for large-eddy simulation (LES) of turbulence that is provably ideal in at least two important senses: a simulation using the ideal model matches all spatial statistics and minimizes error in the large-scale dynamics. However, the ideal model embodies a tremendous amount of …
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Parallel multigrid for large-scale least squares sensitivity
… of climate sensitivities for a homogeneous isotropic turbulence model, the largest scale LSS computation performed to date.
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2D PIV Study of Grid Turbulence
… aim of the current project was to analyse grid turbulence with a technique that allows for a direct measurement of velocity derivative statistics. Two-dimensional particle image velocimetry ($2D~PIV$) of highly resolved grid turbulence at $Re_{M}=U_{\infty}M/\nu = 16000$ where $M$ is the grid …
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A New Two-Scale Decomposition Approach for Large-Eddy Simulation of Turbulent Flows
… cases of turbulent flows, including forced isotropic turbulence, mixing layers and well-developed channel flow, and demonstrated good capabilities to capture turbulent flow features using relatively coarse grids.
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Point source dispersion in a direct numerical simulation of turbulent channel flow
… diffusivity on the effectiveness of the turbulence to disperse a foreign substance (or heat) are also explored. A new method is proposed for calculating the effect of Peclet number on the Lagrangian property autocorrelation in isotropic turbulence. Computed property autocorrelations, from …
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Kinematic simulation of turbulent flow and particle motions
… a new method for simulating high Reynolds number turbulence which requires much less computing power. This involved both theoretical work - to understand and model the important processes - and computational work, to implement the model efficiently. There are 'many different techniques for …
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Experimental setups for studying homogeneous-isotropic and rotating turbulence in clay suspensions: Preliminary results
Homogeneous and isotropic turbulence (HIT) has been at the center of a vast span of research seeking fundamental understanding and insights on the phenomenon of turbulence, which is ubiquitous in nature as well as engineering. The HIT assumption greatly simplifies the analytical treatment of …
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Gas absorption with chemical reaction in an agitated reactor
… gas rates. A correlation based on the theory of isotropic turbulence has been proposed and found to correlate the data well.
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Dynamics of Langmuir circulation in oceanic surface layers
… a model which assumes small-scale mixing by near-isotropic turbulence. The latter profile is unstable to Langmuir cells when waves are present. The inclusion of cells driven by wave-current interaction explains the failure of the mixed layer to restratify on two days with high waves and low wind. …
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Development and Application of Hybrid Wray-Agarwal Turbulence Model and Large-Eddy Simulation
… the industry. RANS methods require modeling of turbulence effect (i.e. turbulence modeling) based on empirical relations and therefore often produce low accuracy results for many flows. In recent years, the Large Eddy Simulation (LES) approach has been developed which has shown promise of …
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