Change from wall to pressure-inlet bc

biond8 · September 20, 2018, 10:35

hi everyone!

I have to simulate methane injection in a ic engine, and I want to change the bc from wall to pressure inlet in order to do that. I think I have to creat an event on dynamic mesh section, but which type exactly? Is it activate cell zone or insert boundary zone layer? Thanks to anyone will answer me

LuckyTran · September 20, 2018, 13:34

You just go to boundary conditions and change the type from wall to pressure inlet. I.e. you compute up to the desired time using a wall and at the desired time, change it, and compute the remaining time.

biond8 · September 20, 2018, 13:51

Thanks for you reply! I’m searching for something more auotomatic, but if there isn’t another way, I’ll follow your advice

LuckyTran · September 21, 2018, 18:43

How much automation do you need and why? It's only a few button clicks. You can spend 10 days to do 10 seconds of work or you can spend 10 seconds.

If you know how to use text commands you can write a journal file. It would be max 6 lines long.

Code:

rcd casename
/solve/ dual-time iterate # #

a few more lines here to change bc

/solve/dual-time iterate # #

wcd casename y
exit ok

biond8 · September 22, 2018, 02:19

Thanks!!! No, I don’t know how to use text command, but I’ll try next monday! I wanted something automatic because I launched my simulation from university computer yesterday in the evening, so I can’t stay in front of the pc all the time, I’ll se my result only nect monday! But thank you anyway for you reply, if I’ll be allowed to use that pc in monday I’ll try!

September 20, 2018, 10:35	Change from wall to pressure-inlet bc	#1
biond8 New Member Laura Join Date: Jul 2018 Posts: 14 Rep Power: 7	hi everyone! I have to simulate methane injection in a ic engine, and I want to change the bc from wall to pressure inlet in order to do that. I think I have to creat an event on dynamic mesh section, but which type exactly? Is it activate cell zone or insert boundary zone layer? Thanks to anyone will answer me

September 21, 2018, 18:43		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,668 Rep Power: 65	How much automation do you need and why? It's only a few button clicks. You can spend 10 days to do 10 seconds of work or you can spend 10 seconds. If you know how to use text commands you can write a journal file. It would be max 6 lines long. Code: rcd casename /solve/ dual-time iterate # # a few more lines here to change bc /solve/dual-time iterate # # wcd casename y exit ok

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September 20, 2018, 13:34		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,668 Rep Power: 65	You just go to boundary conditions and change the type from wall to pressure inlet. I.e. you compute up to the desired time using a wall and at the desired time, change it, and compute the remaining time.

September 20, 2018, 13:51		#3
biond8 New Member Laura Join Date: Jul 2018 Posts: 14 Rep Power: 7	Thanks for you reply! I’m searching for something more auotomatic, but if there isn’t another way, I’ll follow your advice

September 22, 2018, 02:19		#5
biond8 New Member Laura Join Date: Jul 2018 Posts: 14 Rep Power: 7	Thanks!!! No, I don’t know how to use text command, but I’ll try next monday! I wanted something automatic because I launched my simulation from university computer yesterday in the evening, so I can’t stay in front of the pc all the time, I’ll se my result only nect monday! But thank you anyway for you reply, if I’ll be allowed to use that pc in monday I’ll try!