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-   -   FLUENT DPM unsteady particle time step VS injection time step (https://www.cfd-online.com/Forums/fluent/171901-fluent-dpm-unsteady-particle-time-step-vs-injection-time-step.html)

wv1216 May 19, 2016 12:47

FLUENT DPM unsteady particle time step VS injection time step
 
The user manual says " You can either Inject Particles at Particle Time step or at the flow time step."

Is it possible to setup a user defined injection time step in unsteady tracking, which is different from the particle tracking time step?

For example, I want to study particles in its mean free path without any collisions.

I know the particle flow rate, say 1E7 particles injected per second. And I know the time corresponding to its mean free path say 1E-10s.

If I set the particle tracking time step is 1E-10s, then because of "injection time step=tracking time step", then I injected 1E-10s * 1E7/s =1E-3 particles. This is unphysical! The particle number should be integer, at least 1.

Who could provide some suggestion in the above scenario?

Thank you.

WW


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