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-   -   How to define injections in DPM model (http://www.cfd-online.com/Forums/fluent/32679-how-define-injections-dpm-model.html)

lingo December 9, 2003 01:38

How to define injections in DPM model
 
Hi,everyone!

I'm simulating a spray phenomenon with DPM model .I don't know how to define injections correctly.When I define an injection as i will,there always are messages such as"warning:injection 23 not found in domain" or particle tracks could not be displayed because the Max and Min of particle variable are '1e+20 and -1e+20'.Who knows ?Could you tell me? I have another question ,can I define several injections once?Thank you very much!

lingo

David December 9, 2003 14:10

Re: How to define injections in DPM model
 
hi,

yes you can define several injection once using group type of injection.You can choose several locations or using surface ionjection type.

For the first question, you need to define the injection location inside your domain, that is essential and then you shouldnt get the error message.

hope this helps

David

lingo December 9, 2003 22:55

Re: How to define injections in DPM model
 
Hi,David:

I'm so glad to receive your advice.I also have another question,How to define the injection properties such as "inner injector Diam ,outer injector Diam and so on".Maybe I don't know the meaning of such properties.Thank your for your help!

lingo

David December 10, 2003 05:33

Re: How to define injections in DPM model
 
hi Lingo,

no problem for the help.

You simply have to define the dimensions of your injector, as well as the mass flow rate,the diameter of your droplets etc...

You should be able to get the dimensions of your nozzle in your constructor's documentation.

I hope this helps

David

lingo December 11, 2003 22:29

Re: How to define injections in DPM model
 
Hi,David:

Thank you for your help!Today I can display the particle tracks .Regards!

lingo

lasbet yahia December 16, 2003 11:22

Re: How to define injections in DPM model
 
Hi i would like track a trajectories of particles with injection but i cant understand what is the influence of condition escaped, reflect and trap in fluent


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