Simulation of the Effects of an Air Blast Wave - ELSA - Europa

Figure 33: Maximum pressures versus distance – spherical modelsSPHE2, SPHE3, SHPE4 and SPHE5These calculations use finer meshes. The maximum pressures are increasing. The models SPE2 andSPE4 give realistic results. The models SPHE4 and SPHE5 give larger maximum pressure than theexperimental values. An Eulerian calculation should normally result in smaller values than theexperimental values (in contrast to a Lagrangian calculation which reacts stiffer with smallerelement sizes).SPHE6The larger values for the maximum pressure in model SPHE5 start near the charge. Therefore, themodel SPHE6 tests if a smaller element size in the outer charge (See d) red range) can result inmore realistic values.The overestimating of the pressure begins in this model earlier than in the model SPHE5. The sizeof the elements in the explosive should not be the reason for the overestimation.SPHE7This calculation uses a finer mesh in the inner charge (See Figure 31 d) green range). With thesmaller elements in the inner charge also the number of the elements in tangential direction isincreased.The results are quite better. For every model with small elements there is a limit from which the cal-45