Computation of Free-Surface Ship Flow at Full-Scale and Model-Scale Reynolds Number Using VOF Method

摘要

Predicting ship flow at full-scale Reynolds number is an important topic in numerical towing tank. It is also one of the advantages when comparing with a real towing tank. In the Gothenburg 2000 workshop, a VLCC hull form is used to be a test case of this topic. Reynolds number of this ship at modelscale and full-scale is 4.6*10~6 and 2.0*10~9, respectively. With the double model assumption, the free-surface effect is not taken into account in this case. In this workshop, many calculated results at model-scale agree well with measured data. Due to lack of measured data, the full-scale predictions are hard to be validated. However, obvious differences between model-scale and full-scale predictions can be observed in many fluid properties. It shows that Reynolds number still plays an important role, especially for the near-ship properties. Volume-of-fluid method (VOF) is a robust method when computing ship flow with free surface. Not only for the simplified ship hull but also for the practical hull form, many researches point out that the predicted results are in good agreements with the experimental ones.