Computation of the pressure field around a underwater vehicle by a boundary integral method

Pressure sensitive sea mines reacts on the depression generated by a passing vessel. To design trigger criterions for a sea mine it´s important to be able to calculate how the depression depends on the vessel hull and speed and the sea depth. In this report we presents a boundary integral method to calculate the pressure- and velocity field around a vessel advancing on calm open water. The method utilize the linearized free-surface Gree´s function which assumes the flow is incompressible and irrotational. This assumption should be valid for a underwater vehicle at slow speed. To illustrate the method we presents calculation on the pressure field and wave pattern for a sphere advancing just below the water surface.