The Marine Dynamics Virtual Laboratory (MDVL) is a virtual replica of the physical towing tank facility at the Institute for Marine Dynamics of the National Research Council of Canada. It is intended that the MDVL will be used to duplicate, numerically, various experiments that have been conducted in the IMD towing tank over the last 15 years. In turn, the physical model data will be used to validate the results of MDVL. Through this physical-numerical validation process, an acceptable degree of confidence in the results of MDVL numerical testing will be achieved. Once the validation process is completed, MDVL will be used to simulate the behaviour and performance of full scale marine vehicles in various sea states.