In this article,based on the CFD method,the impact of tunnel opening depths on hull resistance is examined.The thrust channel is typically found at the ship's bow and runs perpendicular to the flow direction.A vortex flow forms in the channel at this moment as a result of the flow separation effect,and the stability of this vortex flow has an impact on the hull resistance.The RANS method is utilized to investigate the vortex's flow properties in the channel with varying tunnel depths,and the variation in hull resistance is examined.The findings indicate that when the opening depths to opening diameter ratio reaches a value of 0.4 and the hull resistance increment reaches its maximum and the hull resistance increases by more than 1％.However,when the tunnel deep increases continually,the increment of hull resistance increment decreases.The stability of vortex in the tunnel and the interference between several vortex are also discovered through flow field correlation analysis to be contributing factors to the rise in hull resistance.The research findings presented in this paper can serve as a design technical guide for the bow thruster tunnel.
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