Collision avoidance is paramount in the high-density environments in which many personal aerial vehicles operate simultaneously. Within myCopter, we are taking inspiration from nature and are developing swarming and flocking algorithms for PAVs based on animal swarms and human crowd behaviour. We have developed simulation software that can simulate realistic vehicle behaviour and that can be operated in real-time or in an accelerated mode. Collision avoidance strategies are implemented in this simulation software to analyse detailed vehicle behaviour.