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explicit-algebraic-reynolds-stress-models
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Investigation of Longitudinal Tabs Effects on Compound Triple Jets Configuration in Film Cooling, Applying Large Eddy Simulation Approach
, M.Sc. Thesis Sharif University of Technology ; Taeibi Rahni, Mohamad (Supervisor) ; Ramezanizadeh, Mehdi (Supervisor)
Abstract
In the present work, large eddy simulation approach was employed to investigate flows such as backward facing step and internal channel flow, using Smagorinsky and explicit algebraic subgrid-scale models (EASSM) in OpenFOAM software. For this purpose, an explicit algebraic subgrid-scale model was added to OpenFOAM. Coupling pressure and velocity fields were applied to the PISO-SIMPLE (PIMPLE) algorithm. The focus of the present study was to assess various subgrid scale models, in order to predict the behavior of several flows, as well as their extensive numerical study. The results were compared to available experimental data showning that the EASSM results were more accurate than...
Investigation of Flow Inside the Pressure Swirl Atomizer
, Ph.D. Dissertation Sharif University of Technology ; Nouri Boroujerdi, Ali (Supervisor)
Abstract
In the present work, the behavior of flow inside the pressure-swirl atomizers (PSA) is studied by the numerical simulation. The pressure-swirl atomizer is widely used in many industrial applications such as fuel injection in gas turbine, internal combustion engine and liquid-fuel rocket, spray drying, spray in firing and agricultural nozzles.
The flow simulation inside the injector (PSA) deals with many complicated considerations due to air core formation in the axial zone of the injector as well as high tangential and axial velocities in the swirl chamber. The two phase flow is modeled by level set methods in the pressure swirl atomizer. Moreover, the explicit algebraic Reynolds stress...
The flow simulation inside the injector (PSA) deals with many complicated considerations due to air core formation in the axial zone of the injector as well as high tangential and axial velocities in the swirl chamber. The two phase flow is modeled by level set methods in the pressure swirl atomizer. Moreover, the explicit algebraic Reynolds stress...
Numerical simulation of laminar and turbulent two-phase flow in pressure-swirl atomizers
, Article AIAA Journal ; Volume 50, Issue 10 , 2012 , Pages 2091-2101 ; 00011452 (ISSN) ; Kebriaee, A ; Sharif University of Technology
AIAA
2012
Abstract
This paper has developed an axisymmetric laminar and turbulent two-phase flow solver to simulate pressure-swirl atomizers. Equations include the explicit algebraic Reynolds stress model, the Reynolds-averaged Navier-Stokes, and the level set equation. Applying a high-order compact upwind finite difference scheme with the level set equation being culminated to capture the interface between air-liquid two-phase flow and decreasing the mass conservation error in the level set equation. The results show that some recirculation zones are observed close to the wall in the swirl chamber and to the axis. This model can predict converting the Rankin vortex in the swirl chamber to the forced vortex in...