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Islam, A.K.M. Sadrul,Hasan, R.G.M. Techno-Press 2002 Wind and Structures, An International Journal (WAS Vol.5 No.1
This paper reports the numerical calculations of uniform turbulent shear flow around a square cylinder. The predictions are obtained by solving the two-dimensional unsteady Navier-Stokes equations in a finite volume technique. The turbulent fluctuations are simulated by the standard $k-{\varepsilon}$ model and one of its variant which takes care of the realizability constraint in order to suppress the excessive generation of turbulence in a stagnation condition. It has been found that the Strouhal number and the mean drag coefficient are almost unaffected by the shear parameter but the mean lift coefficient is increased. The present predictions are compared with available experimental data.
Computation of transonic internal flow around a biconvex airfoil with cavity
M. Mostaqur Rahman,A. B. M. Toufique Hasan,A.K.M. Sadrul Islam,S. Matsuo,T. Setoguchi 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.6
At transonic flow conditions, unsteady self-excited shock waves are frequently observed in several modern internal aeronautical applicationssuch as in turbine cascades, compressor blades, butterfly valves, fans, nozzles, diffusers and so on. The appearance of shock oscillationoften causes serious problems such as aero-acoustic noise, non-synchronous vibration (NSV), intense drag rise, high cycle fatiguefailure (HCF) and buffeting. In recent years, the effect of various passive means on the airfoil are investigated both experimentally andnumerically to find the effectiveness as a shock control device. In the present study, the transonic internal flow around an airfoil using acavity as a passive means of shock control was investigated numerically. Computational results are validated with available experimentaldata. Results showed that the airfoil with cavity significantly reduced the flow field unsteadiness such as the amplitude of pressure oscillationand root mean square of pressure oscillation.