CFD Online Logo CFD Online URL
Home > Forums > CFX

CFX-Pre Expression

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   August 2, 2006, 08:56
Default CFX-Pre Expression
Posts: n/a
Hello, who can help me?

I want to create an expression as a function of time

At t=0s I want a Temperature of 300K then until t=60s T shoulp be equal to 923.4 K then after t>60s T should be stable at the level of 923.4 K. So how can I get an expression with this time Steps? For 0s=<t=<60s I would need an expression like: T=300[K]+Time*10.39[K s^-1]

And for t>60s I would need the expression T=923,4K

But how can I combine this?
  Reply With Quote

Old   August 2, 2006, 09:16
Default Re: CFX-Pre Expression
Posts: n/a
Dear Roland,

Please read the documentation about the CEL step function.. It is meant for this type of situation..


  Reply With Quote

Old   August 2, 2006, 10:18
Default Re: CFX-Pre Expression
Ram Dayal
Posts: n/a
Dear Roland Use min function. first calculate T1=300[K]+Time*10.39[K s^-1],then T2=923.4[K] then T=min(T1,T2). I think this should work. Bye Ram Dayal
  Reply With Quote

Old   August 2, 2006, 10:29
Default Re: CFX-Pre Expression
Posts: n/a
Thank you, it worked with the step function
  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
only 1 of many named selections not showing up in cfx pre mihirbhagat CFX 0 July 5, 2011 05:22
Defining a domain in CFX Pre ashtonJ CFX 1 June 13, 2011 02:34
different CFX Pre and Post mesh region mactech001 CFX 9 April 11, 2010 21:08
Problems with adding two meshes together in CFX Pre peterputer1 CFX 2 September 23, 2009 08:08
CFX Pre - TGrid Vivek Vasudevan CFX 2 March 20, 2007 07:31

All times are GMT -4. The time now is 08:25.