Assessment study on two regularized Navier-Stokes models for simulating large-eddy turbulent flow
Date Issued
2011
Date
2011
Author(s)
Lin, Yu-Xin
Abstract
This thesis explores and analyzes the characteristics of Turbulence Models by comparing the results with original incompressible viscous Navier-Stokes equations.This thesis is constructed from the two-dimensional in orthogonal non-staggered grids in pressure and velocity coupling configuration mode, to discretize the governing equations by finite-difference method, to make computational fluid dynamic equations for precisely.
Turbulence model is based on the changes of nonlinear incompressible Navier-Stokes equations in convective terms or diffusion terms and adjust their ratio in the momentum equations.In addition, we want to suppress its non-linear growth, but also hope to use a less cost (coarse grid or less computing time) to obtain information about turbulent flow, rather than using a high cost to solve the nonlinear incompressible Navier-Stokes equations. This approach is called Regularization.
This study discusses two turbulence models: Leray-alpha model and Navier-Stokes-alpha model. These two turbulence models are similar. They both change the momentum equations convection terms.Through numerical simulation, we expect to understand the benefits of there turbulence models. We also hope to know the differences between them and the original non-linear incompressible Navier-Stokes equations.
Subjects
incompressible viscous Navier-Stokes equations
turbulence model
nonlinear
regularization
convection term
Type
thesis
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