Abstract
A three-dimensional computational analysis has been carried out to investigation the pulsatile flow through a S-shaped curved channel. The numerical study is performed using Reynolds-averaged Navier-Stokes equation, where a pulsated velocity field is imposed as an inlet condition. Validation for the present study is done using unsteady pulsatile conditions through a simple 90o bend channel. Then the analysis has been extended using S-shaped curved pipe for Reynolds number of 600, velocity component ratio of 1 and different time periods varied from 5s to 25s. The temporal and spatial distribution of variables like axial velocity distribution, secondary flow vectors, wall shear stress and strength of secondary flow has been analysed. The secondary flow streamline patterns at different planes for different time periods have distinguished the effect of time period on the secondary flow. Two counter rotating vortices, in addition to the former vortex pattern have been found in the second bend for different time periods of pulsatile cycle. Fluctuation of WSS has been observed for different moments at different time periods and the position of maximum fluctuation has also been identified. Time average wall shear stress has been found to decrease with time periods from 5 to 25.
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