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Articles by K.S. Sai
Total Records ( 2 ) for K.S. Sai
  Swamy N.S., , H.R. Nataraja , K.S. Sai , S.B. Tiwari and B. Nageswara Rao
  This study considers the Rivlin-Ericksen constitutive equation for the Cauchy stress in the equation of motion to examine the flow of an incompressible second-grade fluid with an oscillating rigid moving plate. Simple and reliable numerical procedures are used to obtain the parameters in the analytical expressions for the velocity field and the shearing stress on the moving plate. The Doppler effect is noticed from the increased frequency due to the motion of the plate. The thickness of the boundary layer reduces with an increase in the magnetic interaction parameter.
  S.B. Tiwari , B. Nageswara Rao , H.R. Nataraja and K.S. Sai
  This research is concerned primarily with nonlinear oscillations of a modified van der Pol equation. The motion is represented by the harmonic oscillator equation, with the addition of a small nonlinear term. The governing differential equation falls under autonomous category. The solution of the problem is examined utilizing the method of slowly varying amplitude and phase (the Krylov-Bogoliubov-Mitropolsky technique). Stationary values of the amplitude are obtained and discussed their stability. It is noted that the stable limit-cycles of the differential equation in the higher order averaging method can be identified easily from the time derivative of the amplitude function and the sign of its derivative at the stationary value of the amplitude.
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