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Effect of flow patterns on frequency characteristics of turbulent flow in a T-junction

Abstract In the present study, the turbulent flows in a T-junction are investigated by using large eddy simulations at two different flow pattern conditions of wall and impinging jets. Their momentum ratios ( ) are 1.86 and 0.114 for wall jet and impinging jet, respectively. In particular, one of the main objectives is to identify the physical parameters that scale the turbulent flow in a T-junction. The dominant frequencies existing downstream region of a T-junction are reasonably scaled by using the diameter of the branch pipe and the velocity of the main pipe as the reference length and velocity. At high (corresponding to the wall jet) they have similar value (∼0.2) corresponding to the vortex shedding frequency reported in the literature. On the other hand, at lower (corresponding to the impinging jet), with increasing the frequencies are decreased. As a result, they clearly show some certain trend with respect to