Compound channel consists of a main channel with floodplains on either side or both sides. In the converging compound channel, the main channel width decreases gradually downstream, leading to complex flow patterns and significant changes in velocity and shear stress distributions. Despite having significant applications in river management, flood control, and irrigation, the hydraulic properties of open channels with floodplains are challenging to predict because the interaction between the main channel and the floodplain flow is complex. This complex behavior is numerically modeled using different turbulence models like k-epsilon, k-omega, LES, etc. In the large eddy simulation (LES) method, flow characteristics (like velocity and shear stress distributions) are modeled with a computational fluid dynamics (CFD) approach. In this paper, 3D model numerical simulation with LES turbulence model is used to model the converging compound channel. Numerical simulation has been performed using ANSYS FLUENT software to investigate the changes in velocity profiles, shear stress distribution across various converging sections within a compound channel. This enables the study of how the velocity distribution alters as the channel geometry narrows, providing valuable insights into the flow behavior. The LES model is employed to solve turbulence equations due to its ability to provide improved large eddy structures. The results obtained from the numerical simulation are found more accurate, when validated with the other sources.