TIME–DEPENDENT FLOW THROUGH ASYMMETRIC CONTRACTION AND EXPANSION CHANNEL

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

Abstract


A computation of flow through asymmetric contraction and expansion channel is presented in the paper. A two–dimensional model is reported for computing incompressible flow of Newtonian fluid adopting Navier–Stokes equations using semi–implicit Taylor–Galerkin finite element algorithm. The flow is expected at downstream of asymmetric expansion section is gradually/rapidly varied flow and generating vortices on both sides of channel wall. This approach allows to explore very complex hydrodynamics phenomena like computation and analysis of unsteady/transient free–surface flows present hydraulic structures. The different inertial (Reynolds number) values are used for computing of flow structure by streamline contours, velocity and pressure values. It is observed that, by enhancing inertial values, the wake on 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 solving complex geometrical hydrodynamic problems.

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