Examinando por Autor "Owen, D."

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  • Miniatura
    PublicaciónAcceso abierto
    On the effect of earthquakes of short duration on curvilinear shaped dams using a generalised Schwarz-Christoffel theory. (Matemáticas).
    (2011-10-13) Owen, D.
    The works of Chawng, J. Fluid. Mech., Vol. 87, 343-348 (1978) and Liu, J. Fluid Mech., Vol. 165, 131-145 (1986) on the effect of earthquakes on constant slope dams are extended to the case where the surfaces of the dams have curvilinear shapes. A generalised Schwarz-Christoffel theory is used to obtain general expressions for the hydrodynamic pressure distributions on the curvilinear surfaces of the dams in terms of certain functions which define the curvilinear nature of the surfaces. Two types of dam systems are examined.
  • Miniatura
    PublicaciónAcceso abierto
    On the flow of an Oldroyd-B liquid through a straight circular tube performing longitudinal and torsional oscillations of different frequencies.
    (2011-10-13) Owen, D.; Rahaman, K.
    The flow of an Oldroyd-B liquid in a straight, circular, tube oscillating longitudinally and torsionally at different frequencies is examined. The flow does not start from rest but is assumed to be fully established. We obtained analytical solutions for the velocity components which were assumed to have the frequencies of the velocities of the corresponding boundary components. We also obtained analytical expressions for the shear-stresses and drag on the cylinder. The velocity components and work done are displayed graphically using particular values of the flow parameters.
  • Miniatura
    PublicaciónAcceso abierto
    On the unsteady flow of an Oldroyd liquid B in a straight circular tube.
    (2011-10-13) Owen, D.; Bhatt, B.S.
    Time dependent flow of an Oldroyd liquid B in a straight circular tube is examined. An approach to describe the flow when a general pressure-gradient and general initial conditions are given, is considered. The initial conditions imposed in the present work include the initial distributions of velocity and acceleration. Some general results are derived and three applications are considered.
  • Miniatura
    PublicaciónAcceso abierto
    Relative motion of fluid spheres with a porous core.
    (2011-10-13) Bhatt, B.S.; Owen, D.
    Relative motion of fluid spheres with a porous core has been considered. The flows in free fluid regions are governed by the Navier-Stokes equations whereas the flow in the porous region is governed by the Brinkman model. The exact solution has been found using Stokes' approximation. Drag expressions have been derived for the porous sphere and the inner liquid sphere. Several particular cases have been discussed.