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[FAQ]

The message can be the result of various things: 0) If particle tracking does not use the fluid flow time step, this message is generated during sub cycling of transient DPM particles in an unsteady fluid flow simulation. This is basically to avoid a particle mass imbalance during sub cycling and when tracking particles at a smaller time step than the fluid. In the end of the fluid time step the particles are advanced. During this “Advancing DPM injections” step the injected particles are no more deleted. There is no action needed for this message in this case. 1) Manipulation of the simulation time (changing the rp-var flow-time) 2) Activation of the break-up and collision model 3) Too small particles are injected (threshold value depends on injection type (inert, droplet, multicomponent etc.)) 4) Particles are injected outside of the flow field