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DPM-SteadyFlow-About Stop/Stard Time Properties and Particle Time Step Size

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Old   October 8, 2014, 11:33
Unhappy DPM-SteadyFlow-About Stop/Stard Time Properties and Particle Time Step Size
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souria
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Hey everyone,
What is exact meaning of stop time in the set injection properties in the fluent under define injection ?
I'm simulating sediment transport (in river) for a STEADY FLOW. In case, I choose "Unsteady Particle Tracking" , these parameters refer to what step ? What time ?

Start time, Stop Time
The Particle Time Step size
Number of time Steps
Max. Number of steps
Step Length

Are these parameters depending on the time of calculation ? or on the number of the iterations ?
Thanks for your help


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Old   October 8, 2014, 23:43
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Ghazlani M. Ali
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Hi souria,
When the DPM (discrete phase model) is activated, The calculation related to your particles are not solved in the same time as your gasous domain. the two calculation are done separately. Fluent solves your flow for a certain given iterations (that you provided), then makes a pause to use calculated properties in the DPM calculation. Therefor, you can solve your gaseous domain in a steady state fashion, and the DPM in a transient fashion. You have to understand that the two calculation are done separately. and since the dpm is in a transient fashion, obviously you have to set a time step, start and stop time. I hope I was clear
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Old   October 9, 2014, 03:36
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Thans for your answer, If I'd really get it, you mean there's no relationship between the number of iterations (Im in steady flow, so the calculation is just gouverned by itérations and no time step...) and the Time step that we choose to solve the DPM.
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