TRANSIENT ANALYSIS OF TWO–DIMENSIONAL FREE SURFACE FLOW THROUGH HYDRAULIC STRUCTURE

A. A. MAHESSAR, Z. A. K. BALOCH, A. L. QURESHI, A. BALOCH

Abstract


Computation of fluid flow in contraction and expansion channel located at upstream of channel is presented in this paper. A two–dimensional model is reported for computing incompressible flow of Newtonian fluid adopting Navier–Stokes equations. A  semi–implicit  Taylor–Gakerkin  finite  element  algorithm. The  flow is  expected  at  downstream of  expansion section  is  gradually/rapidly  varied flow and generating  vortices. This  approach  allows  to  explore  very complex hydrodynamics phenomena like computation and analysis of unsteady/transient  free–surface flows present  hydraulic structures. The different  Reynolds  number (Re) values  are  used  for computing  of streamline flow pattern, velocity  and  pressure  values. It is observed that, with  increasing  Reynolds number, the wake on the downstream of expansion of channel increase. The stability and capability of the numerical algorithm can be ascertained from the predicted results that the proposed model can be used efficiently for computing through solving of complex geometrical hydrodynamic problems.

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