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problem with viewing DPM

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Old   March 9, 2016, 03:54
Default problem with viewing DPM
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hi,
i have ran this multiphase Eularian with DDPM model for a flow in 1.5 long cylinder. however, the contours and data for the DPM appear for up to 0.4 m of the total pipe length. the particles are injected by surface injection from the inlet... does any body has any hint why is that?
thanx in advance
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File Type: jpg DPM velocity contours-2654.jpg (56.8 KB, 11 views)
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Old   March 9, 2016, 18:11
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Is your inlet on the right hand side? Perhaps your particle trajectories are incomplete (check the summary data after simulating), and then you should increase the maximum number of steps in the DPM dialog box. A maximum number of particle steps are specified to avoid infinite loops where particles are trapped in a flow.
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Old   March 10, 2016, 23:01
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Quote:
Originally Posted by `e` View Post
Is your inlet on the right hand side? Perhaps your particle trajectories are incomplete (check the summary data after simulating), and then you should increase the maximum number of steps in the DPM dialog box. A maximum number of particle steps are specified to avoid infinite loops where particles are trapped in a flow.
thank you very much, i had to increase the DPM maximum steps as you mentioned. however, how to decide the maximum number of DPM steps?

i really appreciate your help. thanks again.
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Old   March 11, 2016, 06:12
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Originally Posted by engineer.iman View Post
how to decide the maximum number of DPM steps?
Generally trial and error. However, if you're using a highly refined mesh with complex flow then the particle steps should be small, leading to a higher number of steps required when compared to a simple laminar flow with a coarse mesh.
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