Abstract
Two-dimensional Finite Element model has been developed for computing incompressible fluid flow using Navier-Stokes equations applying Taylor-Galerkin technique. This approach allows exploring complex hydrodynamic phenomena to compute and analyze unsteady flow patterns in open channel with contraction and expansion. In this paper, numerical results were initially compared with analytical solution to validate the developed model, which reveal good qualitative and quantitative agreement with predictions of other numerical model. Numerical computations were made before, during and after contraction/expansion in two-dimensional channels, in order to understand the transient behavior due to increased length in the downstream. Streamline flow pattern and velocity distribution were computed for various Reynolds number (Re) values at different time units. It was found that wake on downstream side of contraction channel is increased with the increase in Reynolds number value. The present model yields realistic results for addressing irregular problems in the
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