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 ($M_R$) 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 $M_R$ (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 $M_R$ (corresponding to the impinging jet), with increasing $M_R,$ the frequencies are decreased. As a result, they clearly show some certain trend with respect to $M_R.$

Additional information

Funding

This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) no. 2017M2A8A4018482.