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-   -   Difficult ICEMCFD question: Extrusion (http://www.cfd-online.com/Forums/cfx/23363-difficult-icemcfd-question-extrusion.html)

Walter December 1, 2006 09:28

Difficult ICEMCFD question: Extrusion
 
Hi all,

I'm sure you have all used the mesh extrusion function at some time:

http://img113.imageshack.us/img113/3337/fixedko7.th.jpg

The fixed distance extrusion is simple enough: Total extrusion distance = Extrusion distance x Number of layers

However, I'm trying to use the "Function" option i.e. extrusion distance is controlled by a function. The manual is completely silent on how to do this. I think it probably requires a TCL function input but I dont know how to do this and again the manual is silent :(

http://img151.imageshack.us/img151/7...tionkg8.th.jpg

Does anyone know how to do this?

Thanks!

myron December 1, 2006 10:31

Re: Difficult ICEMCFD question: Extrusion
 
Here's a screen shot of a function with explanation. If you give me an ftp area for where to put it, I can give you an Excel spreadsheet.

http://img178.imageshack.us/my.php?i...udefuncrc7.jpg

Walter December 1, 2006 10:38

Re: Difficult ICEMCFD question: Extrusion
 
Awesome. Thanks. This was driving me nuts!

Could you email it to me? ppjjones@gmail.com

Most of the web share services force you to jump through endless loops.

Joe December 1, 2006 11:01

Re: Difficult ICEMCFD question: Extrusion
 
I dug around and found a very easy to use web share service:

http://www.gigasize.com/

Just use the quick upload option. No registration etc needed :)

myron December 1, 2006 12:30

Re: Difficult ICEMCFD question: Extrusion
 
Try this link:

http://www.sharebigfile.com/file/293...ction.xls.html

Walter December 1, 2006 13:00

Re: Difficult ICEMCFD question: Extrusion
 
Awesome. Thanks again.

To think I just needed to use the layer keyword :)

Vincent December 5, 2006 05:27

Re: Difficult ICEMCFD question: Extrusion
 
When I try to use an exponential function for the cell height: 0.0125*1.25^(layer-1), ICEM responds with "Error: can't use non-numeric string as operand of "^"" How can I solve this?

myron December 5, 2006 11:39

Re: Difficult ICEMCFD question: Extrusion
 
Looks like a question for your support provider - or try ** instead of ^ to see if that allows it.

Walter December 5, 2006 18:02

Re: Difficult ICEMCFD question: Extrusion
 
Have you resolved this yet?

Vincent December 6, 2006 04:00

Re: Difficult ICEMCFD question: Extrusion
 
The correct syntax is: 0.0125 * pow (1.25, layer-10

Mazze[ITA] April 15, 2011 10:08

Sorry, I don't want to dig a 5 years old thread, but it doesn't work. Someone could tell me the correct syntax for an exponential function?

Mazze[ITA] April 19, 2011 02:22

I've sorted out writing:
"height of first layer" * (1+ "arbitrary number "*(layer-1)*(layer-1)*(layer-1))


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