This repository presents a numerical study on the galloping behaviour of Vertical Transport System (VTS) cross-sections for deep-sea mining applications. A quasi-steady 3DOF time-domain model is used to assess the stability of two project-specific cross-sections and to evaluate the influence of added-mass modelling on predicted onset and response amplitude. The work provides an early-stage screening framework for identifying inflow orientations that may be susceptible to galloping-type instabilities.