Wang, JianhuaJianhuaWangWan, DechengDechengWan2021-03-102021-03-102019-0911th International Workshop on Ship and Marine Hydrodynamics (IWSH2019), Paper 73http://hdl.handle.net/11420/9039High Reynold number (Re) viscous flow is one of the most typical characteristics of an advancing ship. Therefore, the wake flow after the ship hull is very complex and it will strongly affect the propulsion performance. RANS approach and hybrid LES/RANS methods are very popular in the contemporary research of ship flows, with the consideration of less computational cost compared with LES. In the present work, several numerical models, i.e. standard Shear Stress Transport (SST) model for RANS, DES, Delayed DES (DDES) and Improved Delayed DES (IDDES) model are used to predict the viscous flows around a full block ship. Numerical computations are carried out by the in-house CFD solver naoe-FOAM-SJTU developed on OpenFOAM. The ship model Japan Bulk Carrier (JBC) is used in the present computations and the numerical setup is following the benchmark case in Tokyo 2015 CFD Workshop. Extensive experimental data including detailed wake flows through PIV measurements is available for the validation of the CFD results. Predicted results of ship resistance, wake flow in different cross sections are presented and compared with the experimental data. The results based on different DES approaches are discussed and compared with the RANS results. It is found that the IDDES method can improve the performance in predicting turbulence features. Good agreement with experimental results shows that the RANS approach can give good prediction of the resistance, while IDDES approach is more suitable in predicting the complex viscous flows around full block ship hull.enhttp://rightsstatements.org/vocab/InC/1.0/IDDESJBC shipShip wake flowTurbulence modelsTechnikIngenieurwissenschaftenConference Paper10.15480/882.336410.15480/882.3364Fluiddynamik und Schiffstheorie M-8Conference Paper