Which type of release geometry generally results from a liquid release of energy, such as detonation or violent rupture?

• A. Hemispheric
• B. Spherical
• C. Planar
• D. Cylindrical

Answer: (A)

A sudden energy release from a liquid, such as detonation or violent rupture, drives a blast wave outward from the source. When this release occurs near a surface like the ground or a container wall, energy cannot propagate below that boundary, so the wavefront expands predominantly above the surface, forming a hemispherical shape. This hemispherical geometry reflects the way the energy radiates in three dimensions while being constrained by a boundary.

Planar geometry would come from a sheet-like release along a plane, which isn’t typical of a rapid, point-like energy discharge. Spherical geometry implies an unrestricted expansion in all directions, which isn’t the case when a surface limits half the space. Cylindrical geometry would result from a long crack or line source, not a localized liquid energy release.