CFX 4.4 delay differential equation (DDE)

November 25, 2006, 21:59

Hello all,

I am using CFX4.4, try to implement and solve a set of delay differential equations, does anyone know whether it is possible for the user to recall and use old variables, from varying and different time steps from the same simulation? If not, is there other methods to implement the DDE?

Many Thanks, Joan

Saeef · May 16, 2019, 08:13

I also need help.

Gert-Jan · May 16, 2019, 09:13

Do you really need help for implementing this in CFX4?

Saeef · May 16, 2019, 11:52

Quote:

Originally Posted by Gert-Jan

Do you really need help for implementing this in CFX4?

Absolutely. I have created a new post with detail.
Add a lag correction equation

Gert-Jan · May 16, 2019, 12:11

You asked you question in an ancient query from 2006 when CFX had a structured version, called CFX 4.
Your new question (Add a lag correction equation) clearly shows you are using the newer unstructured version, called CFX 5.

Saeef · May 16, 2019, 22:35

Quote:

Originally Posted by Gert-Jan

You asked you question in an ancient query from 2006 when CFX had a structured version, called CFX 4.
Your new question (Add a lag correction equation) clearly shows you are using the newer unstructured version, called CFX 5.

Does this make a big difference to the transport equation?

Gert-Jan · May 17, 2019, 04:56

Certainly, the physics remain the same but the software is completely different. Incomparable.
I don't know anyone that is using CFX 4. Too outdated.

November 25, 2006, 21:59	CFX 4.4 delay differential equation (DDE)	#1
Joan Guest Posts: n/a	Hello all, I am using CFX4.4, try to implement and solve a set of delay differential equations, does anyone know whether it is possible for the user to recall and use old variables, from varying and different time steps from the same simulation? If not, is there other methods to implement the DDE? Many Thanks, Joan

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May 16, 2019, 08:13		#2
Saeef New Member Zhiyuan Liu Join Date: Oct 2018 Location: China Posts: 26 Rep Power: 9	I also need help.

May 16, 2019, 09:13		#3
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,994 Rep Power: 29	Do you really need help for implementing this in CFX4?

May 16, 2019, 12:11		#5
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,994 Rep Power: 29	You asked you question in an ancient query from 2006 when CFX had a structured version, called CFX 4. Your new question (Add a lag correction equation) clearly shows you are using the newer unstructured version, called CFX 5.

May 17, 2019, 04:56		#7
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,994 Rep Power: 29	Certainly, the physics remain the same but the software is completely different. Incomparable. I don't know anyone that is using CFX 4. Too outdated.