Research on underwater explosion bubble dynamics nearby cylindrical structure

To study underwater explosion bubble dynamics nearby cylindrical structure in deep water,three-dimensional numerical model was established based on boundary element method under potential flow assumption.Then the bubble motion and the influence of attack angles on bubble dynamics were achieved using the model.By analysis of different underwater explosion cases,we discovered that the influence of buoyancy and the attraction of cylindrical structure on the expanding bubble are tiny,while the influence of buoyancy and the resistance of cylindrical structure on the shrinking bubble are large.Bubble jet and pulsation become larger as the attack angle decreasing.In other words,the bubble is most destructive when it is right below the cylindrical structure.These conclusions are meaningful for the anti-explosion and protective design of submarine and can provide reference for the future research on the interaction mechanism between the underwater explosion bubble and submerged structures.