# dpm GROUP iNJECTION

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 April 9, 2010, 04:02 dpm GROUP iNJECTION #1 Senior Member   Mohsin Mukhtar Join Date: Mar 2010 Location: South Korea Posts: 249 Rep Power: 9 can anybody please tell me how to use "group" injection type in DPM model. I have a circle having a diameter of 7.6 mm and all the particles will flow through it uniformly. Can anybody tell me how can I work on Group injections to make it flow throughh the circel unifomrly. Thanks

 April 12, 2010, 05:43 #2 New Member   Sydney Miles TEKAM Join Date: Apr 2010 Posts: 7 Rep Power: 8 Hello, Make a "surface injection" . As a surface to release your particle from select your circle.

 April 12, 2010, 10:00 #3 Senior Member   Mohsin Mukhtar Join Date: Mar 2010 Location: South Korea Posts: 249 Rep Power: 9 Thank you At last somebody replied here Actually I need to increase the number of particles As u may know that for increasing number of particles there are 2 ways. First you can change the mesh size or u can use group injection. So i opt for group injection coz uincreasing number of mesh size is not a good way. Now When i used "group" injections in DPM injection panel, The track summary gave me the message "104 particles not found in injection-0 ", My injection center point is (0,0,60) from center (0,0,0). First point Last point X position=-3.8 X position=3.8 Y position=-3.8 Y position=3.8 Z position=60 Z position=60 The upper inlet is 60 (positive z direction) from the center (0,0,0). The upper inlet circle's radius is 3.8 from where the coal will come. So from -3.8 to 3.8 in x and y directions the 104 particles would be injected (as the particle stream is 104). Your suggestion may of help to me

 April 12, 2010, 10:25 #4 New Member   Sydney Miles TEKAM Join Date: Apr 2010 Posts: 7 Rep Power: 8 is it a 2D or 3D case? I was under the impression that group injection is only to inject particle on a straight line pattern????!!! so what do you expect with this type of injection (group onjection i mean)

 April 12, 2010, 10:38 #5 Senior Member   Mohsin Mukhtar Join Date: Mar 2010 Location: South Korea Posts: 249 Rep Power: 9 Yes it will inject particles through a line. for example X position=-3.8 X position=3.8 with particle streams =3 then from -3.8 to 3.8 on the line 3 particles will be injected. first at -3.8 second at 0 and the third at 3.8. Thats what i know. For my case I have a circle (3d case). I have to inject particles throughout the crcle for that reason what i can do is to divide the circle among several lines and create groups. But its giving me error when i include z direction. I dont know what is the problem. My querry has been discussed before as well. But actually i still dont understand what to do. They are talking about tolerance. I did what they said but still it didnt work. If u understand. It would be a great help for me http://university.fluent.com/forum/v...d566bf363a10b7 and here question number 1 http://university.fluent.com/forum/v...81747321324927

 May 3, 2010, 04:10 Injection #6 Member   ali Join Date: May 2009 Posts: 58 Rep Power: 9 Do check units of mesh and injection are they same..

 December 13, 2010, 11:18 #7 Member     Marta Lazzarin Join Date: Jun 2009 Location: Italy Posts: 70 Rep Power: 9 Dear all, I am trying to set up a test case where i need to have the injection of particles from a surface. I would like to use the dpm for this and to use one of the injectors model available. Anyway, I am unable of setting the model correctly and i also have problems with the boundary conditions, since the dpm window says that it is not available and that it is impossible to specify any data/BC for particles. Can you help me solving my problem? Thanks a lot, Marta

 December 13, 2010, 11:45 particle #8 Member   ali Join Date: May 2009 Posts: 58 Rep Power: 9 your case ,,,2D axisymetric or 3D?

 December 13, 2010, 11:56 #9 Member     Marta Lazzarin Join Date: Jun 2009 Location: Italy Posts: 70 Rep Power: 9 Thanks for the quick reply, it is a 3D case.

 December 13, 2010, 14:03 dpm #10 Member   ali Join Date: May 2009 Posts: 58 Rep Power: 9 normally iits easy to define a surface injection just slectting the surface ( which may be inlet boundary or out let or somewhere in between flow)thats all... you can give temperature , density , mass fraction and distribution ... not able to understand if you are mentioning the same or anything else?

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