Is that possible for setting a input which is varied by sensor?

mega2tera · December 16, 2014, 04:04

How can I set a radiation input which is changed as the temperature variation of specific point, like a PID control process. Using CEL maybe solve this?
If somebody have any related experience, please share with me and help me out, thanks a lot.

ghorrocks · December 16, 2014, 04:38

PID loops need historical data, that is the value of something is carried over from a previous time step.

It is difficult (but not impossible) to get values from previous time steps in CEL. Do a search of the forum if you want to find out how. Be warned - it is not pretty.

A nicer way of doing it is with user fortran. But then you need to learn user fortran and that is not straight forward either.

diamondx · December 16, 2014, 10:46

There is a tutorial in CFX, where the temperature of a room is controlled by a thermostat. May be you can check it...

ghorrocks · December 16, 2014, 17:12

That example does not show anything like a PID controller. But the fortran file is a good template which could be adapted to become one.

mega2tera · December 16, 2014, 22:46

Thanks for your guys, I will search these information, I have feel that maybe it is hard to realize, but that's the fun part, right?

I will working on that, and maybe need more helps from you, thanks again.

December 16, 2014, 04:04	Is that possible for setting a input which is varied by sensor?	#1
mega2tera New Member Nathan Join Date: Jul 2014 Posts: 4 Rep Power: 12	How can I set a radiation input which is changed as the temperature variation of specific point, like a PID control process. Using CEL maybe solve this? If somebody have any related experience, please share with me and help me out, thanks a lot.

December 16, 2014, 10:46		#3
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	There is a tutorial in CFX, where the temperature of a room is controlled by a thermostat. May be you can check it... __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

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December 16, 2014, 04:38		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,819 Rep Power: 144	PID loops need historical data, that is the value of something is carried over from a previous time step. It is difficult (but not impossible) to get values from previous time steps in CEL. Do a search of the forum if you want to find out how. Be warned - it is not pretty. A nicer way of doing it is with user fortran. But then you need to learn user fortran and that is not straight forward either.

December 16, 2014, 17:12		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,819 Rep Power: 144	That example does not show anything like a PID controller. But the fortran file is a good template which could be adapted to become one.

December 16, 2014, 22:46		#5
mega2tera New Member Nathan Join Date: Jul 2014 Posts: 4 Rep Power: 12	Thanks for your guys, I will search these information, I have feel that maybe it is hard to realize, but that's the fun part, right? I will working on that, and maybe need more helps from you, thanks again.