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Computational Simulation of Turbulent Film Cooling, Using RANS/LES Hybrid Approach and Digital Filter Based Interface Boundary Conditions

Sheikholeslam Noori, Mahdi | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41621 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Taeibi-Rahni, Mohammad
  7. Abstract:
  8. Nowadays, hybrid LES/RANS approach is being widely used by many researchers. This approach uses the advantages of both LES and RANS approaches simultaneously. Hybrid approach is as accurate as LES, but its cost is much lower. The biggest problem of hybrid approach is transformation of data between RANS and LES regions. Before, precursor simulation and synthetic methods, such as Fourier series and synthetic eddy methods (SEM) have been used extensively to solve such problems. Precursor simulation is expensive, because of high cost of generation of data. On the other hand, Fourier series method is confined to simple geometries, while SEM has problem of programming. Interface condition in this research is generated by digital filter (DF), which is used in signal processing and changes or corrects characteristics of a discritized series. In this regard, effective parameters in DF were studied. A hybrid LES/RANS code was developed using DF to generate the interface condition. Then, jet into cross flow problem (film cooling application) was simulated. In this study, new concepts, such as LES/RANS approach and data generation for LES/RANS interface, were extensively investigated. The results show that digital filter is more accurate than the ones used before.

  9. Keywords:
  10. Digital Filters ; Film Cooling ; Turbulence Flow Simulation ; Hybrid LFS/RANS Approach ; Interface Condition Generation

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