Qustion about CFX expression bug

Anna Tian · May 11, 2013, 14:05

Hi,

The expression

'if(atstep<50.5,1 [s],1e-5 [s])'

is used to set up the time step changing from 1 s to 1e-5 s after the accumulated time step reaches 50.

Why it doesn't work? Any bug?

ghorrocks · May 12, 2013, 08:12

Seems OK based on the glimpse you have given us - but if it does not work can you please show the error message?

lnk · May 12, 2013, 13:18

Quote:

Originally Posted by ghorrocks

Seems OK based on the glimpse you have given us - but if it does not work can you please show the error message?

It just doesn't shift the time step length after the accumulated time step number passed 50.

Anna Tian · May 12, 2013, 18:10

Quote:

Originally Posted by lnk

It just doesn't shift the time step length after the accumulated time step number passed 50.

Yes. Exactly. It is not shifting. Why?

ghorrocks · May 12, 2013, 20:29

No idea. There are lots of easy work-arounds, so I would not worry about the details of why this does not work and just use another method to define your time step.

May 11, 2013, 14:05	Qustion about CFX expression bug	#1
Anna Tian Senior Member Meimei Wang Join Date: Jul 2012 Posts: 494 Rep Power: 16	Hi, The expression 'if(atstep<50.5,1 [s],1e-5 [s])' is used to set up the time step changing from 1 s to 1e-5 s after the accumulated time step reaches 50. Why it doesn't work? Any bug? __________________ Best regards, Meimei

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May 12, 2013, 08:12		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Seems OK based on the glimpse you have given us - but if it does not work can you please show the error message?

May 12, 2013, 20:29		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	No idea. There are lots of easy work-arounds, so I would not worry about the details of why this does not work and just use another method to define your time step.