CFX Particle Injection time

P9408 · August 14, 2014, 01:55

Dear All
I would like to ask you about the problem about the solid particle injection, my problem is the solid particle inject in rectangular pipe from t=0 [s] to 0.25 [s] and my total simulation time is 2 [s], so what should I do to stop particle injection at t = 0.25 [ s ] because right now every time step are injected the particle.

Thank you

ghorrocks · August 14, 2014, 06:49

Are the solid particle lagrangian particles?

Can you make the particle flow rate a CEL expression? Something like if(t<0.25[s],10[kg/s],0[kg/s])

P9408 · August 14, 2014, 10:47

Hi ,
Thank you for your information, I try as your suggest but still have the error

| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Floating point exception: Invalid number

also I try to reduce the time step but still have probles, so, do you have any suggestion

Note : I use Lagrange particle model.

ghorrocks · August 14, 2014, 18:35

It probably does not like a zero flow rate. Try 0.001[kg/s] (or some other small number) rather than zero.

August 14, 2014, 01:55	CFX Particle Injection time	#1
P9408 New Member Thanathat Join Date: Mar 2009 Posts: 7 Rep Power: 17	Dear All I would like to ask you about the problem about the solid particle injection, my problem is the solid particle inject in rectangular pipe from t=0 [s] to 0.25 [s] and my total simulation time is 2 [s], so what should I do to stop particle injection at t = 0.25 [ s ] because right now every time step are injected the particle. Thank you

August 14, 2014, 10:47	CFX Injection error	#3
P9408 New Member Thanathat Join Date: Mar 2009 Posts: 7 Rep Power: 17	Hi , Thank you for your information, I try as your suggest but still have the error \| ERROR #001100279 has occurred in subroutine ErrAction. \| \| Message: \| \| Floating point exception: Invalid number also I try to reduce the time step but still have probles, so, do you have any suggestion Note : I use Lagrange particle model.

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August 14, 2014, 06:49		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Are the solid particle lagrangian particles? Can you make the particle flow rate a CEL expression? Something like if(t<0.25[s],10[kg/s],0[kg/s])

August 14, 2014, 18:35		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	It probably does not like a zero flow rate. Try 0.001[kg/s] (or some other small number) rather than zero.