This paper investigates the identification of hydrodynamic derivatives for ships sailing in restricted waters and discusses their influence on course keeping stability. Planar Motion Mechanism (PMM) tests are numerically replicated drawing upon the solution of the Reynolds-averaged Navier-Stokes (RANS) equations. Both lateral and vertical flow restrictions are considered in systematic pure sway and yaw tests. The powerful influence canal walls or river topologies exert upon ships is notorious among pilots and hydrodynamicists because these effects aggrevate both ship handling and maneuvering prediction. While new vessels in inland waterway shipping tend to grow in size, existing waterways do not - this in turn imposes increased challenges to ensure safe and easy traffic. In this context maneuvering prediction methods become more important. Related Work. Abundant discussions of ship hydro-dynamics in restricted waters and numerical methods for prediction can be found in Tuck (1978), Newman (1978) and reference therein. More recently, investigations covering both Boundary Element Methods (BEM) and RANS-CFD relate to the International Conference on Ship Maneuvering in Shallow and Confined Waters (e.g. Liu, 2011) or the SIMMAN workshop (Stem et al., 2
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