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Investigation of Longitudinal Tabs Effects on Compound Triple Jets Configuration in Film Cooling, Applying Large Eddy Simulation Approach

Mehrjoo, Amir Reza | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50879 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Taeibi Rahni, Mohamad; Ramezanizadeh, Mehdi
  7. Abstract:
  8. 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 Smagorinsky-Lilly model, with comparatively less computational effort. Ensuring that the code was doing well, the jet into cross flow problem with unit density ratio was simulated, using LES operating EASSM subgrid scale model. To provide a turbulent inlet, a recycling rescaling model was applied. Different arrangements of the flow were modelled, including triple jets and longitudinal tabs. The results reviled that the tabs remove low pressure area near flat surface boundary layer resulting in more stability in boundary layer and less mixing. As a result, it lowers the center of the counter-rotating vortex. The optimum height for tabs was also investigated, using our simulation results
  9. Keywords:
  10. Large Eddy Simulation (LES) ; Jet into Cross Flow Interaction ; Explicit Algebraic Reynolds Stress Model ; Recycling ; OpenFOAM Software ; Smagorinsky Model ; Lund Recovery Recycling

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