Computational Simulation of Flow over a Cylinder in Ground Effect, Using PANS

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Nirooei, Mohammad Hossein | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41811 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Taeibi-Rahni, Mohammad
Abstract:
Partially Averaged Navier-Stokes (PANS) turbulence approach provides a closure model for any degree of velocity field filtering, ranging from completely resolved direct numerical simulation (DNS) to completely Reynolds averaged Navier-Stokes (RANS) approach. Preliminary investigations of PANS show promising results, but there is still computational and physical issues that must be addressed. This study investigates the performance of the PANS method for turbulent flow around a cylinder in ground effect with Reynolds number of 13,200. The cylinder flow is a benchmark flow problem which has significant experimental results available for validation of PANS approach. Three different filters have been studied dynamically and two cases were compared: zero transport model (ZTM) and maximum transport model (MTM). Results show that for the steady state flow case, PANS operates much better than RANS approach, but for the unsteady flow, its accuracy is equal to that RANS of. Also, zero transport model operates better than maximum transport model
Keywords:
Surface Effect ; Reynolds Average Navier-Stocks (RANS)Method ; Numerical Simulation ; Large Eddy Simulation (LES) ; Partially Averaged Navier-Stokes (PANS)

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