CFD Online Logo CFD Online URL
Home > Forums > CFX

how CFX can achive interpolation for mate-property

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

LinkBack Thread Tools Display Modes
Old   July 19, 2006, 01:20
Default how CFX can achive interpolation for mate-property
Posts: n/a
how CFX can achive interpolation for material property?

i want to import some steam's material property,using interpolating. like piecewise-liner,in fluent.

how can i do in cfx?can i achive that using CEL,and how~

thanks in advance~
  Reply With Quote

Old   July 19, 2006, 08:23
Default Re: how CFX can achive interpolation for mate-prop
Posts: n/a
Dear prayskier,

do you have discrete data points, or analytical expressions? For the discrete data points you can create either 1d dimensional interpolation functions (assuming depends only on T or p).. For 2d (T and P), you can create an RGP file and define your material properties in it (several materials supplied by CFX use RGP files).

If you have analytical expressions, just type them in on the RHS of the CCL parameter for the particular properties. If the equation is too complex and cannot be done via CEL, you still can write a User CEL Function (see documentation)

Also, where does the steam data comes from? CFX has some steam data (wet and dry, high and low pressure) already in their database. For 11.0, I understand that more steam data is coming out (IAWPS equations).

Failing all the above, I will contact CFX help directly since they do steam calculations themselves all the time..

Good luck,


  Reply With Quote

Old   July 20, 2006, 03:12
Default Re: how CFX can achive interpolation for mate-prop
Posts: n/a
thanks very much for replying this for me~

i found the steam data file in CFX,in that"……etc/materials-extra-materials-virial.ccl",am i right?

my reference presure=14atm,and temperature=1400K,more or less,using dry steam~ the mostup temperature in steamHP.rgp is 900K,not enough for me.Must I creat an HGP file,and find some data when steam temp is 1400K?

could you give some advice for me? thanks a lot~
  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
Pros and Cons for CFX, CFdesign, COMSOL Val Main CFD Forum 3 June 10, 2011 02:20
Cloud Interpolation in CFX 5 Jens CFX 0 September 9, 2003 06:35
CFX 5.5 fails to start from an interpolation Astrid CFX 7 March 16, 2002 17:20
CFX 4.4 installation problem Pandu Sattvika CFX 1 December 1, 2001 05:07
CFD Short Course & CFX User Day Chris Reeves CFX 0 September 11, 2000 08:53

All times are GMT -4. The time now is 16:17.