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 7 of 7 for “"Subgrid Models"”.
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Comparing Simulations and Observations of Galaxy Evolution: Methods for Constraining the Nature of Stellar Feedback
… Careful treatment of this interaction in subgrid models, so-called because they operate on scales below the resolution of the simulation, is crucial for the development of realistic galaxy models. Equally important is developing effective methods for comparing simulation data against …
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Examining the growth and evolution of magnetic fields in clusters of galaxies: a numerical perspective
… fields is necessary to understand and constrain models of diffuse synchrotron emission from clusters. One favored model for generating magnetic fields is through the amplification of weak seed fields in active galactic nuclei (AGN) accretion disks and their subsequent injection into cluster …
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Toward Ideal Large-Eddy Simulation
It is established that there is a 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 …
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Study of two-way coupled particle laden turbulent flow over a backward-facing step using large-eddy simulation
… study, we perform a comprehensive assessment of subgrid-scale (SGS) models for LES by considering a two-way coupled particle-laden turbulent flow over a backward-facing step. We consider dynamic eddy viscosity, wall-adapting local eddy viscosity (WALE), and dynamic one-equation models for the …
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A Filtered-Wall Formulation for Large -Eddy Simulation of Wall -Bounded Turbulence
… of wall-bounded flows in this context: the usual subgrid-scale modeling and boundary-stress modeling. We propose to use optimal LES subgrid models, and a wall-stress model formulated to minimize the 'leakage' of energy and momentum through the filtered wall. This modeling approach was applied to …
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Direct and large-eddy simulation of interactions between reacting flows and evaporating droplets
… trends. In LES, to avoid arbitrary tuning of subgrid model coefficients, fully dynamic procedures have been designed following the Germano procedure and implemented for the main six subgrid models. LES of a heated plane jet, a reacting jet diluted with evaporating droplets and a simplified …
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Modeling and simulation of liquid microlayer formation and evaporation in nucleate boiling using computational fluid dynamics
… interface of the bubble and resort to subgrid models to account for the evaporation of the microlayer at the microscopic scale. The applicability of this subgrid modeling approach relies on the capacity to initialize the microlayer shape and extension, prior to its evaporation. However, …