Applied Mathematics and Mechanics (English Edition) ›› 2013, Vol. 34 ›› Issue (1): 85-96.doi: https://doi.org/10.1007/s10483-013-1655-8

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Time-dependent stagnation-point flow over rotating disk impinging oncoming flow

S. MUNAWAR1,2, A. MEHMOOD3, A. ALI 1   

  1. 1. Department of Mathematics, Quaid-I-Azam University, Islamabad 44000, Pakistan
    2. Department of Mathematics, School of Science and Technology, University of Management and Technology, Lahore 54000, Pakistan;
    3. Department of Mathematics, International Islamic University, Islamabad 44000, Pakistan
  • 收稿日期:2012-01-05 修回日期:2012-08-06 出版日期:2013-01-03 发布日期:2013-01-03
  • 通讯作者: S. MUNAWAR E-mail:sufian.munawar@hotmail.com

Time-dependent stagnation-point flow over rotating disk impinging oncoming flow

S. MUNAWAR1,2, A. MEHMOOD3, A. ALI 1   

  1. 1. Department of Mathematics, Quaid-I-Azam University, Islamabad 44000, Pakistan
    2. Department of Mathematics, School of Science and Technology, University of Management and Technology, Lahore 54000, Pakistan;
    3. Department of Mathematics, International Islamic University, Islamabad 44000, Pakistan
  • Received:2012-01-05 Revised:2012-08-06 Online:2013-01-03 Published:2013-01-03
  • Contact: S. MUNAWAR E-mail:sufian.munawar@hotmail.com

摘要: The unsteady stagnation point flow of an incompressible viscous fluid over a rotating disk is investigated numerically in the present study. The disk impinges the oncoming flow with a time-dependent axial velocity. The three-dimensional axisymmetric boundary-layer flow is described by the Navier-Stokes equations. The governing equations are solved numerically, and two distinct similarity solution branches are obtained. Both solution branches exhibit different flow patterns. The upper branch solution exists for all values of the impinging parameter and the rotating parameter
. However, the lower branch solution breaks down at some moderate values of . The involvement of the rotation at disk allows the similarity solution to be transpired for all the decreasing values of . The results of the velocity profile, the skin friction, and the stream lines are demonstrated through graphs and tables for both solution branches. The results show that the impinging velocity depreciates the forward flow and accelerates the flow in the tangential direction.

关键词: similarity solution, stagnation point flow, rotating disk, numerical solution, elastic half-space, shear load, second order elasticity effects, integral transform

Abstract: The unsteady stagnation point flow of an incompressible viscous fluid over a rotating disk is investigated numerically in the present study. The disk impinges the oncoming flow with a time-dependent axial velocity. The three-dimensional axisymmetric boundary-layer flow is described by the Navier-Stokes equations. The governing equations are solved numerically, and two distinct similarity solution branches are obtained. Both solution branches exhibit different flow patterns. The upper branch solution exists for all values of the impinging parameter and the rotating parameter
. However, the lower branch solution breaks down at some moderate values of . The involvement of the rotation at disk allows the similarity solution to be transpired for all the decreasing values of . The results of the velocity profile, the skin friction, and the stream lines are demonstrated through graphs and tables for both solution branches. The results show that the impinging velocity depreciates the forward flow and accelerates the flow in the tangential direction.

Key words: similarity solution, stagnation point flow, rotating disk, numerical solution, elastic half-space, shear load, second order elasticity effects, integral transform

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