Develoment of prediction method for hydrodynamic forces acting on a drifting ship using three-dimensional discrete vortex method

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Applying three-dimensional discrete vortex method, prediction method for hydrodynamic forces acting on a drifting ship was developed. Vortex elements which are shed from ship hull were expressed by vortex sheets and vortex blobs. We clarified the influence of the height of vortex layer around ship hull, the initial radius of vortex blob and the maximum circulation of vortex sheet on the accuracy of the prediction of hydrodynamic forces acting on a ship hull. Then we confirmed that the prediction method can estimate a qualitative tendency of hydrodynamic forces due to the change of drift angle.