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[ENeo178]

Hi, thanks for your reply. 

I have used the following formula to calculate the total mass flow rate (kg/s) = volume fraction/volume of particle multiplied by the area of the geometry (2D pipe) and by the particle velocity, and the calculated value 11 kg/s. However, the solver could not complete the calculation with the message ''reverse flow'' ''turbulent viscosity limited'' and ''floating point error'' when this value is set. Hence, I set the value to default (1e-20) and the simulation completed but the solver returns a value zero for particle radial distribuion even when it says some particles are trapped on the walls.  

Some assistance with setting the mass flow rate and how many particles are injected when the surface type injection is set would be boost. 

Many thanks,