Simplified RANSE simulation of a side launching

In some Polish shipyards, building small vessels like AHTS, fishing vessels and container feeders, side launching is the basic method of launching. Due to safety reasons, in some cases Ship Design and Research Centre S.A. is asked to perform the model tests of side launching to estimate the following parameters of the hull motion during the launching: • Heel angles – too large heel angle causes the risk of capsizing or hitting the quay. • Minimum distance between the cribbing of the hull and the bottom of the basin. A series of such tests for 115 m container ship were performed lately. On the other hand, a numerical method for solving the flow around moving bodies was successfully implemented by Ship Design and Research Centre S.A. –till now it was used for evaluating the flow around the ship hull free to trim and sink. Satisfactory results of these computations encouraged to apply the numerical method for the prediction of hull motion during side launching, and the first attempt of such computations is presented below.