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Global stability analysis of axisymmetric boundary layer over a circular cylinder

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Abstract

This paper presents a linear global stability analysis of the incompressible axisymmetric boundary layer on a circular cylinder. The base flow is parallel to the axis of the cylinder at inflow boundary. The pressure gradient is zero in the streamwise direction. The base flow velocity profile is fully non-parallel and non-similar in nature. The boundary layer grows continuously in the spatial directions. Linearized Navier–Stokes (LNS) equations are derived for the disturbance flow quantities in the cylindrical polar coordinates. The LNS equations along with homogeneous boundary conditions forms a generalized eigenvalues problem. Since the base flow is axisymmetric, the disturbances are periodic in azimuthal direction. Chebyshev spectral collocation method and Arnoldi’s iterative algorithm is used for the solution of the general eigenvalues problem. The global temporal modes are computed for the range of Reynolds numbers and different azimuthal wave numbers. The largest imaginary part of the computed eigenmodes is negative, and hence, the flow is temporally stable. The spatial structure of the eigenmodes shows that the disturbance amplitudes grow in size and magnitude while they are moving towards downstream. The global modes of axisymmetric boundary layer are more stable than that of 2D flat-plate boundary layer at low Reynolds number. However, at higher Reynolds number they approach 2D flat-plate boundary layer. Thus, the dam** effect of transverse curvature is significant at low Reynolds number. The wave-like nature of the disturbance amplitudes is found in the streamwise direction for the least stable eigenmodes.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology, Gandhinagar, India

    Ramesh Bhoraniya & Narayanan Vinod

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  1. Ramesh Bhoraniya
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  2. Narayanan Vinod
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Correspondence to Narayanan Vinod.

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Communicated by Vassilios Theofilis.

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Bhoraniya, R., Vinod, N. Global stability analysis of axisymmetric boundary layer over a circular cylinder. Theor. Comput. Fluid Dyn. 32, 425–449 (2018). https://doi.org/10.1007/s00162-018-0461-5

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