INSTABILITY INVESTIGATION GRADUAL EXPANSION OF NEWTONIAN FLOW .IN A PLANARGRADUAL EXPANSION

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SHAHMARDAN M.M.; NOROUZI M.; SHAHBANI ZAHIRI A.

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Journal: Modares Mechanical Engineering Year:2013 | Volume:13 | Issue:3 Page(s): 28-36

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Title

INSTABILITY INVESTIGATION GRADUAL EXPANSION OF NEWTONIAN FLOW .IN A PLANARGRADUAL EXPANSION

Author(s)

SHAHMARDAN M.M. | NOROUZI M. | SHAHBANI ZAHIRI A. | Issue Writer Certificate

Keywords

CRITICAL REYNOLDS NUMBERQ2

EXPANSION ANGLEQ2

INSTABILITYQ2

SYMMETRIC VORTEXQ2

ASYMMETRIC VORTEXQ2

Abstract

The main object of current study is investigation of INSTABILITY threshold of flow in a gradual expansion from symmetric to asymmetric situations. The expansion ratio is 1:3 and EXPANSION ANGLEs are 30, 45, 60 and 90 degree. Discretization of governing equations is performed using finite volume method based on PISO algorithm on a staggered mesh. The CFD code is validated based on the results of sudden expansion reported in previous works. Here, the effects of EXPANSION ANGLE and Reynolds number on flow INSTABILITY in transition from symmetric situation to two and three asymmetric vortices are investigated and the first and second CRITICAL REYNOLDS NUMBERs are obtained. The bifurcation diagrams of vortices and velocity profile in centerline are plotted for each case and the effects of INSTABILITY on flow field are discussed based on them. Unlike the previous studies which have been focused on the planar flow in sudden expansions, the flow INSTABILITY in gradual expansions with different EXPANSION ANGLEs is investigated which is the main innovation of current study.

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APA: Copy

SHAHMARDAN, M.M., NOROUZI, M., & SHAHBANI ZAHIRI, A.. (2013). INSTABILITY INVESTIGATION GRADUAL EXPANSION OF NEWTONIAN FLOW .IN A PLANARGRADUAL EXPANSION. MODARES MECHANICAL ENGINEERING, 13(3), 28-36. SID. https://sid.ir/paper/179664/en

Vancouver: Copy

SHAHMARDAN M.M., NOROUZI M., SHAHBANI ZAHIRI A.. INSTABILITY INVESTIGATION GRADUAL EXPANSION OF NEWTONIAN FLOW .IN A PLANARGRADUAL EXPANSION. MODARES MECHANICAL ENGINEERING[Internet]. 2013;13(3):28-36. Available from: https://sid.ir/paper/179664/en

IEEE: Copy

M.M. SHAHMARDAN, M. NOROUZI, and A. SHAHBANI ZAHIRI, “INSTABILITY INVESTIGATION GRADUAL EXPANSION OF NEWTONIAN FLOW .IN A PLANARGRADUAL EXPANSION,” MODARES MECHANICAL ENGINEERING, vol. 13, no. 3, pp. 28–36, 2013, [Online]. Available: https://sid.ir/paper/179664/en

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