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Escape mode in lagrangian

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Old   January 18, 2013, 08:18
Default Escape mode in lagrangian
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siamak rahimi ardkapan
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Hello every body,
I am using lagrangian multiphase model to simulate particles in indoor condition.
the problem is that when I activate escape condition for any boundary the lagrangian does not work any more. Do you know what is the problem?
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Old   January 18, 2013, 16:27
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Pretty unlikely, since the information you've given here is ... a little low. Could you please describe a bit more what your issue is? Especially what "does not work anymore" should mean? Steady, Unsteady? Other physics? Etc...
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Old   January 21, 2013, 05:39
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Dear Abdul,

I use steady simulation, K-epsilon, 3 dimensional. I want to remove from the system the particles that touch floor ( because they settle down on the floor). There is an option to use escape mode for the lagrangian phase, but when I activate escape mode, the lagrangian solver stops and iterations continue without giving any data for lagrangian. However I found another way to solve it. I specify the method to be Rebound. Then I put the coefficient to the amount Zero.
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Old   January 21, 2013, 05:44
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Dear Abdul,

I have another question.
I have 20 parcels for 10000 particles. After finishing the iterations of Lagrangian solver Usually I have some parcels that reach the maximum sub-steps. Is the result reliable?
The way of solving this problem is to increase the maximum number of sub-steps, but it will take a lot of time and the track file will be so big.
Thank you in advance
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Old   January 21, 2013, 14:18
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As always this depends on your specific case and your requirements in terms of accuracy, hence it's pretty hard to make any assumptions.

But in general I can tell you that you can't always avoid big files or long computing times just by saying "it takes too long for me and the files are so big". I mean, I know that you would appreciate when it would be much faster, as nearly anybody else. But some kind of simulation just takes some effort.
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