EULER COMPUTATIONS OF THE DIRECT COUPLING BETWEEN INTERIOR, INTERMEDIATE AND EXTERIOR BALLISTICS OF A SELF-PROPELLED 155 MM/52-CALIBRE GUN-HOWITZER INSTALLED ON A TRUCK CHASSIS

摘要

The main objective of this work is to assess the pressure levels obtained over a newdesigned 155 mm/52-calibre gun-howitzer during a firing sequence. For this design, thebarrel muzzle exit is really close to the truck driver’s cab. It is then essential to verify thatthe wall pressure levels resulting from an artillery firing are compatible with the consideredmaterial. For this purpose, the CFD ballistics code FREIN 3D is used to compute the directcoupling between interior, intermediate and exterior ballistics of this new 155 mm/52-calibre gun-howitzer. A simplified geometry is considered for the CFD computation and thecomputational domain involves only a part of the truck chassis since only the pressure levelsover the first part of the truck are of interest. One case is considered, corresponding to anindirect firing.