Is there a limit for CEL expression length?

fml2 · March 26, 2012, 17:48

Hello.

In my model, I use a rather long CEL expression for temperature. It should be a periodic function with not very trivial shape, and I want to avoid user subroutines in fortran. I tried to specify the shape using CEL and with if-expressions.

However, I get an error message (something with "exceeds normal size", can't tell off of my head). If I remove a part of the expression, everything works OK. If I add a piece again, I get the error message. I've checked the syntax several times and think that there is no syntax errors.

Hence I suspect that I hit some limit of the CEL expression length. Is there such limit? If yes, what is the value?

Any help will be much appreciated!

ghorrocks · March 26, 2012, 18:54

I am not sure whether it is a length restriction or a complexity restriction (ie how many functions an expression has), but I am sure there is a restriction.

In that case split the CEL expression into several variables to simplify the expression.

Lance · March 27, 2012, 03:20

Yep, there's a limit. Cant remember the exact limit, but one of my expressions had about 30 nested if-statements which worked. If you need the exact limit I suggest you contact Ansys.

March 26, 2012, 17:48	Is there a limit for CEL expression length?	#1
fml2 New Member Join Date: Mar 2012 Posts: 1 Rep Power: 0	Hello. In my model, I use a rather long CEL expression for temperature. It should be a periodic function with not very trivial shape, and I want to avoid user subroutines in fortran. I tried to specify the shape using CEL and with if-expressions. However, I get an error message (something with "exceeds normal size", can't tell off of my head). If I remove a part of the expression, everything works OK. If I add a piece again, I get the error message. I've checked the syntax several times and think that there is no syntax errors. Hence I suspect that I hit some limit of the CEL expression length. Is there such limit? If yes, what is the value? Any help will be much appreciated!

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March 26, 2012, 18:54		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	I am not sure whether it is a length restriction or a complexity restriction (ie how many functions an expression has), but I am sure there is a restriction. In that case split the CEL expression into several variables to simplify the expression.

March 27, 2012, 03:20		#3
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	Yep, there's a limit. Cant remember the exact limit, but one of my expressions had about 30 nested if-statements which worked. If you need the exact limit I suggest you contact Ansys.