Reading a variable at two different times instants using CFX expression

visitor · September 10, 2022, 08:29

What is the best way in performing such an activity?
Example;
Expression A reads CO at current time,
Probe(CO.Density)@Point 1

How can I read the above in expression B at for instance 1 or more time steps later? This will allow me to compare expression A v B. Thanks.

ghorrocks · September 10, 2022, 22:40

There is no fully supported way in CFX to do this. It is requested all the time.

But you have two unsupported methods to do it:
1) Write a user fortran routine to do it.
2) Using TRANS_LOOP - search for it in the CFX forum.

But don't forget unsupported means it might not work, it could give unexpected results and it could completely fail.

visitor · September 11, 2022, 08:05

Thanks ghorrocks, don't know fortran just C++. It's interesting that we are having these discussions and I hope CFX can do something about this through expression language.

Opaque · September 11, 2022, 13:35

Let us say, Ansys adds support for it w/o knowing your intended use and later you realized that was not enough. What then?

Perhaps if you share the intended use, someone in the forum could explain how to do it using existing features.

September 10, 2022, 08:29	Reading a variable at two different times instants using CFX expression	#1
visitor Senior Member AH Join Date: Apr 2014 Posts: 287 Rep Power: 0	What is the best way in performing such an activity? Example; Expression A reads CO at current time, Probe(CO.Density)@Point 1 How can I read the above in expression B at for instance 1 or more time steps later? This will allow me to compare expression A v B. Thanks.

September 10, 2022, 22:40		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,898 Rep Power: 144	There is no fully supported way in CFX to do this. It is requested all the time. But you have two unsupported methods to do it: 1) Write a user fortran routine to do it. 2) Using TRANS_LOOP - search for it in the CFX forum. But don't forget unsupported means it might not work, it could give unexpected results and it could completely fail. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

September 11, 2022, 13:35		#4
Opaque Senior Member Join Date: Jun 2009 Posts: 1,883 Rep Power: 33	Let us say, Ansys adds support for it w/o knowing your intended use and later you realized that was not enough. What then? Perhaps if you share the intended use, someone in the forum could explain how to do it using existing features. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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September 11, 2022, 08:05		#3
visitor Senior Member AH Join Date: Apr 2014 Posts: 287 Rep Power: 0	Thanks ghorrocks, don't know fortran just C++. It's interesting that we are having these discussions and I hope CFX can do something about this through expression language.