Abstract
Mechanisms of quasi-periodic flow oscillation observed in airfoils near stall and stall behaviour, which affect airfoil efficiency, remain still not fully understood. In this sense, numerical simulations using subgrid-scale models can be useful in order to shed some light in the underlying complex physics. However, the assessment of these models is an important aspect to consider for obtaining credible results. In this work, two LES models are compared with results from direct numerical simulation. The results have shown that LES models are capable of capturing the complex flow phenomena present at these AOA such as the low frequency fluctuations near stall and the vortex shedding produced at higher AOAs.
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References
Nicoud, F., Ducros, F.: Subgrid-scale stress modelling based on the square of the velocity gradient tensor. Flow, Turbulence and Combustion 62, 183–200 (1999)
Hughes, T.J.R., Mazzei, L., Jansen, K.E.: Large eddy simulation and the variational multiscale method. Computing and Visualization in Science 3, 47–59 (2000)
Verstappen, R.: When does eddy viscosity damp subfilter scales sufficiently? In: Quality and Reliability of Large-Eddy Simulations II. ERCOFTAC Series, vol. 16, pp. 421–430 (2011)
Rodríguez, I., Borrell, R., Lehmkuhl, O., Pérez-Segarra, C.D., Oliva, A.: Direct Numerical Simulation of the Flow Over a Sphere at Re = 3700. Journal of Fluid Mechanics 679, 263–287 (2011)
Lehmkuhl, O., Rodríguez, I., Borrell, R., Oliva, A.: Low-frequency unsteadiness in the vortex formation region of a circular cylinder. Physics of Fluids 25, 085109 (2013)
Verstappen, R.W.C.P., Veldman, A.E.P.: Symmetry-Preserving Discretization of Turbulent Flow. Journal of Computational Physics 187, 343–368 (2003)
Hunt, J.C.R., Wray, A.A., Moin, P.: Eddies, stream and convergence zones in turbulent flows. Technical Report CTR-S88, Center for turbulent research (1988)
Tanaka, H.: Flow visualization and PIV measurements of laminar separation bubble oscillating at low frequency on an airfoil near stall. In: 24th International Congress of the Aeronautical Sciences, pp. 1–15 (2004)
Broeren, A.P., Bragg, M.B.: Low-frequency flowfield unsteadiness during airfoil stall and the influence of stall type. In: AIAA Paper, AIAA–98–2517 (1998)
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Rodríguez, I., Lehmkuhl, O., Baez, A., Perez-Segarra, C.D. (2014). On LES Assessment in Massive Separated Flows: Flow Past a NACA Airfoil at Re = 50000. In: Hölling, M., Peinke, J., Ivanell, S. (eds) Wind Energy - Impact of Turbulence. Research Topics in Wind Energy, vol 2. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-54696-9_24
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DOI: https://doi.org/10.1007/978-3-642-54696-9_24
Publisher Name: Springer, Berlin, Heidelberg
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