# Release injection each time step in Fluent 14

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 October 31, 2012, 03:35 Release injection each time step in Fluent 14 #1 New Member   JenFeg Join Date: Oct 2012 Posts: 1 Rep Power: 0 Hello, I'm solving unsteady flow with steady DPM particles. So, I'd like to set up injection to be released only once in each time-step (probably at beggining of time-step). I could not find this settings, can give a hint ? Thank you. jfeg

 November 1, 2012, 11:29 #2 Member     Pedram Mojtabavi Join Date: Apr 2011 Location: Iran Posts: 66 Rep Power: 7 You need to setup a boundary with pulsed on/off type injection? You can write an UDF to define these type of boundary by using a step function. You can use a simple SIN or COS to define that, for exmaple: F(x) = |sin(pi*t/2)|; The function produces 0 ,1 periodically with the progression of time =1,2,3,... I have a code here specifically for on/off injection you can use: ************************************************** ****** #include "udf.h" DEFINE_PROFILE(injection_pulsed_flux, thread, position) { face_t f; real t = CURRENT_TIME; int n; real pi; n = 1000000.*t/1.7; pi = 1.570796; begin_f_loop(f, thread) { F_PROFILE(f, thread, position) = 100.*fabs(sin(pi*n)); } end_f_loop(f, thread) } ************************************************** **** You need to replace you own 1/(delta t) where I have underlined (mine was 1e-6). The F profile will generate a specific number and zero. The "100" could be replaced by your own case's value. Hope it could help, Best regards.

 February 13, 2013, 00:47 Dpm model #3 New Member   santhosh Join Date: Aug 2012 Posts: 3 Rep Power: 6 Hai sir/Madam I am using fluent software for my dpm injections ina GDI engines.Using pressure swirl atomizer i got injectios in the form of V shape instaed of a circular shape in 3d model.Please tell me which parameter does it depend on it. and how to modify. Thank u Santhosh Kumar K

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