A NUMERICAL STUDY ON THE EFFECTS OF OSCILLATION FREQUENCY AND AMPLITUDE ON FLOW AROUND A FLAPPING AIRFOIL VIA AN IMPROVED IMMERSED BOUNDARY METHOD

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HOSSEINJANI ALI AKBAR; ASHRAFIZADEH ALI

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: Modares Mechanical Engineering Year:2015 | Volume:14 | Issue:16 Page(s): 291-301

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Title

A NUMERICAL STUDY ON THE EFFECTS OF OSCILLATION FREQUENCY AND AMPLITUDE ON FLOW AROUND A FLAPPING AIRFOIL VIA AN IMPROVED IMMERSED BOUNDARY METHOD

Author(s)

HOSSEINJANI ALI AKBAR | ASHRAFIZADEH ALI | Issue Writer Certificate

Keywords

IMMERSED BOUNDARY METHODQ2

VORTICITY CONTOURSQ2

FLAPPING AIRFOILQ2

KINETIC ENERGY CONTOURSQ2

Abstract

In this paper an improved IMMERSED BOUNDARY METHOD is used for simulating sinusoidal pitching oscillations of a symmetric airfoil. IMMERSED BOUNDARY METHODs because of using a fixed Cartsian grid are well suited for such moving boundary problems. Two test cases are used to validate the proposed method and the effects of oscillation frequency and amplitude on the flow field are investigated. Flow field vorticity and KINETIC ENERGY CONTOURS are reported in this paper. It is found that the deflected wake start to be appeared for Strouhal number more than 0.4 at a fixed pitching equal to 0.71. A chaotic flow can be observed at oscillation amplitude equal to 2.80, for St= 0.22. Kintic energy contour at St=0.1 show that the airfoil transfers momentum to the flow but the drag force also increases due to the energy loss associated with the enlargement of separation zone behind the airfoil. By increasing the oscillation frequency and amplitude, momentum transfer to the flow increases and the drag force is, therefore, reduced.

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APA: Copy

HOSSEINJANI, ALI AKBAR, & ASHRAFIZADEH, ALI. (2015). A NUMERICAL STUDY ON THE EFFECTS OF OSCILLATION FREQUENCY AND AMPLITUDE ON FLOW AROUND A FLAPPING AIRFOIL VIA AN IMPROVED IMMERSED BOUNDARY METHOD. MODARES MECHANICAL ENGINEERING, 14(16), 291-301. SID. https://sid.ir/paper/177886/en

Vancouver: Copy

HOSSEINJANI ALI AKBAR, ASHRAFIZADEH ALI. A NUMERICAL STUDY ON THE EFFECTS OF OSCILLATION FREQUENCY AND AMPLITUDE ON FLOW AROUND A FLAPPING AIRFOIL VIA AN IMPROVED IMMERSED BOUNDARY METHOD. MODARES MECHANICAL ENGINEERING[Internet]. 2015;14(16):291-301. Available from: https://sid.ir/paper/177886/en

IEEE: Copy

ALI AKBAR HOSSEINJANI, and ALI ASHRAFIZADEH, “A NUMERICAL STUDY ON THE EFFECTS OF OSCILLATION FREQUENCY AND AMPLITUDE ON FLOW AROUND A FLAPPING AIRFOIL VIA AN IMPROVED IMMERSED BOUNDARY METHOD,” MODARES MECHANICAL ENGINEERING, vol. 14, no. 16, pp. 291–301, 2015, [Online]. Available: https://sid.ir/paper/177886/en

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