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.
Results
Showing 1 to 13 of 13 for “"Reynolds stress transport"”.
-
Effects of Turbulence Modeling on RANS Simulations of Tip Vortices
… an isolated finite wing with aspect ratio, , and Reynolds number, . Tip-vortex velocity profiles, vortex core and wake turbulence levels, and Reynolds stresses are compared with wind tunnel measurements. Three turbulence models for RANS closure are tested: the Lumley, Reece, and Rodi full Reynolds …
-
Numerical modeling and simulation of compressible reacting turbulent shear layers
… portion of this work, improved turbulent transport models for compressible shear layers are presented and validated with detailed experimental data. The new compressible models are one-equation and two-equation algebraic Reynolds stress models (ASMs), which account for variations in the …
-
Computation of Reynolds stresses in axisymmetric vortices and jets using a second order closure model
… second-order model [13] is used to close the Reynolds stress transport equations in cylindrical coordinates. A reduced set of equations are then solved for the decay of axisymmetric vortices and jets. A self-similar solution to the axisymmetric vortices is obtained numerically. The …
-
Modeling of Compressibility Effects in Turbulent Boundary Layers
… the turbulent kinetic energy equation and the Reynolds stress transport equation were derived. It was found that most of the thermal compressibility effects are due directly to density fluctuations. The only exceptions are the thermal contribution to the production of turbulent kinetic energy …
-
Design and Analysis of Low Reynolds Number Marine Propellers with Computational Fluid Dynamics (CFD) Transition Modeling
Small-scale marine propellers operate at low Reynolds numbers, where laminar-turbulent transition of the boundary layer can impact the distributions of pressure and shear stress on the blade surface. Marine propellers operating at low Reynolds numbers are subject to laminar-turbulent transition of …
-
Effect of hole configurations on film cooling from cylindrical inclined holes for the application to gas turbine blades
… and crater holes. The present work employs RSM (Reynolds stress transport model) for simulation of turbulent flows in film cooling and the simulation was run using FLUENT computer code. Comparisons are made with experimental data for the film effectiveness distributions. Results show that the …
-
Computational Analysis of Turbulent Flow Around NACA 4412 Airfoil with Open Source CFD Software
… second goal of this research is to implement a Reynolds Stress Transport Model (RSTM) in OpenFOAM. These types of models make less assumptions than the aforementioned eddy viscosity models, and therefore should be able to predict the flow field with a higher order of accuracy. If we can prove …
-
Particulate Deposition Prediction of Diluted Two-Phase Impinging Jet
Insights into particle transport and deposition process in impinging jet flow, in light of the available experiments, can be gained using computational fluid dynamics (CFD) numerical simulations. The present thesis focuses mainly on the prediction of aerosol particle transport and deposition in …
-
Design and application of a novel Laser-Doppler Velocimeter for turbulence structural measurements in turbulent boundary layers
… turbulence structural measurements in high Reynolds number two- and three-dimensional turbulent boundary layers. The new instrument combines, for the first time, new techniques allowing for the direct measurement of particle acceleration and sub-measurement-volume-scale position resolution …
-
A numerical study into the effects of turbulent flows around full-scale buildings
… turbulence models were considered: a complete Reynolds stress model with two alternative proposals for the pressure-strain correlations and a k-E model used in conjunction with both linear and nonlinear stress-strain relationships. The governing differential equations were discretized using …
-
Numerical Investigation using RANS Equations of Two-dimensional Turbulent Jets and Bubbly Mixing layers
… turbulent jets and bubbly mixing layers using Reynolds-Averaged Navier-Stokes (RANS) equations. The behavior of a turbulent jet confined in a channel depends on the Reynolds number and geometry of the channel which is given by the expansion ratio (channel width to jet thickness) and offset …
-
Aerodynamic and Aeroacoustic Analysis of Low Reynolds Number Propellers Using Higher-Order RANS Transition Turbulence Modeling
… technology which operate predominantly in low-Reynolds ($Re$) number regimes. In such regimes, the flow experiences complex boundary layer phenomena like laminar separation, flow transition and reattachment. These effects are known to greatly alter the flow at and near the rotor wall, …
-
A Basic Three-Dimensional Turbulent Boundary Layer Experiment To Test Second-Moment Closure Models
… to stretching and tilting terms in the vorticity transport equations. The positive-z half of the test section contains large areas that generate positive vorticity flux in the trough region and smaller areas generating negative vorticity around the wave peak. The opposite is true for the …