Evaluation of submarine model test in towing tank and comparison with CFD and experimental formulas for fully submerged resistance

1049-1056Towing tanks experiments were conducted to study the behavior of flow on a model of underwater vehicle with tango shape of nose. Length of model and prototype vehicle is 1 and 32 meters, respectively. First the method of underwater model test is evaluated by unequal Reynolds number. An accurate method has been suggested for scaling of results between model and main submarine in underwater testing. Suitable depth for ignoring the free surface effects has been suggested. After underwater test in towing tank and extracting the results, the CFD results have been compared. At last, for more validation of results, four groups of experimental formula for submarine bare hull resistance in deep water have been presented. Finally, the comparison tables and diagrams show the accuracy of each of these six methods in the calculation of submerged resistance of submarine and present an optimum resistance coefficient for this submarine.