How to set intermittent spray injection in fluent DPM?

- March 19, 2021 at 11:01 am
  
  RajasekarK123
  Subscriber
  
  I need to spray liquid in the spray chamber at different timings like 0 to 10s, 30 to 40s, 50 to 60s. is it possible to define such injectionn
- March 19, 2021 at 11:48 pm
  
  Surya Deb
  Ansys Employee
  
  Hello, nYou can define multiple injections with the exact same properties but different start and stop times. nFor the 2nd injection, use start time as 0 s and stop time as 10 s...For the 2nd injection, use start as 30 s and stop as 40 s, etc. nYou could also make use of file injection and Execute Command options to read in the injection file during these intervals.nRegards,nSDn
- March 20, 2021 at 4:34 pm
  
  RajasekarK123
  Subscriber
  
  I tried with different injections with different injection timings but the first injection only injects the spray for the set period, other injections not injecting any at their specified flow timingsnn
- March 23, 2021 at 4:07 pm
  
  Surya Deb
  Ansys Employee
  
  Check your mass flow rates. Are they the same for all the injections? Also, are the injected particles being tracked properly?n
- March 23, 2021 at 4:14 pm
  
  RajasekarK123
  Subscriber
  
  I have same mass flow rates for all the injections and particles also tracked properlyn
- March 24, 2021 at 12:05 pm
  
  Rob
  Ansys Employee
  
  Are the other injection properties (position etc) the same? Each injection will have a different ID so what happens if you plot injection:2 (or whatever it's called) when it should be active?n
- March 24, 2021 at 12:25 pm
  
  RajasekarK123
  Subscriber
  
  Yes all the injections are defined at same coordinate, other than injection 1 no other other injections are spraying liquid. when i plotted mass flow rate of liquid at outlet the curve has some value only for the first injection flow period and stops at the end of injection 1 then the curve reaches 0 kg/s. no other injections are starting even their specified flow time exceeds.n

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