Hull cavitation evolution induced by an underwater explosion (UNDEX) near a deformable structure is numerically investigated using a multiphase compressible fluid solver [1,-3] coupled with an unsteady one-fluid cavitation model [4-5].A series of computations are conducted with varying structure surface curvature.Results suggest that structure surface curvature influence the peak pressures generated from the initial shock loading and the cavitation collapse, as well as the timing and dimension of the cavitation near the surface.