Configure any explosion effect to use the variables listed (specifically the velocity vector ones) here: http://community.bistudio.com/wiki/Arma_3_Particle_Effects:_Config_Parameters#Parameter:_explosionEffects
Example: moveVelocity[] = {"inDirX*10","inDirZ*10","inDirY*10"};
Explosions will have no velocity imparted by the values of these variables.