# cfx error 255

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 November 4, 2012, 15:46 cfx error 255 #1 New Member   Isa.Ebtehaj Join Date: Nov 2012 Posts: 21 Rep Power: 6 Sponsored Links hi i trying so solve the flow throught a pipe , but solver exited with error 255 and sometimes error 1 , please help me

 November 4, 2012, 15:53 #2 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 Wow, a lot of people posting this week about error 255. As far as I know this comes up when the solver diverges. Make sure your problem is set up in a consistent way. Check boundary conditions to make sure they are reasonable. Look in the CFX manual for recommended BC configurations. Also see if lowering timescale helps.

 November 4, 2012, 15:59 #3 New Member   Isa.Ebtehaj Join Date: Nov 2012 Posts: 21 Rep Power: 6 time scale is 0.08s ( leng of pipe 16 m and v=0.484 m/s) then error is Error code 1:

 November 4, 2012, 16:04 #4 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 Timescale seems fine. What are the BCs? What is Reynolds number and are you using a turbulence model?

 November 4, 2012, 16:11 #5 New Member   Isa.Ebtehaj Join Date: Nov 2012 Posts: 21 Rep Power: 6 what is BC? Re = 48400 yes i use a turbulence model

 November 4, 2012, 16:15 #6 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 BC = boundary condition. What is the Mach number?

 November 4, 2012, 16:20 #7 New Member   Isa.Ebtehaj Join Date: Nov 2012 Posts: 21 Rep Power: 6 i have a pipe with : i=0.005 v=0.484 m/s D=0.1m y= 0.7m BC = input ,output , top (free surface) bot ( wall)

 November 4, 2012, 16:24 #8 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 Sorry you are going to have to explain what i and y mean. Also for each of those boundary types there are options you have to specify. You should post them or your CCL file. My guess is something is inconsistent in the boundary conditions.

 November 4, 2012, 16:29 #9 New Member   Isa.Ebtehaj Join Date: Nov 2012 Posts: 21 Rep Power: 6 i= slope of pipe y= height of water in pipe

 November 4, 2012, 16:31 #10 New Member   Isa.Ebtehaj Join Date: Nov 2012 Posts: 21 Rep Power: 6 How is the CClfile created??????

 November 4, 2012, 16:36 #11 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 Interesting. This is a 2 phase flow then with air and water? In CFX-pre you can save the CCL file via file -> export CCL.

 November 4, 2012, 16:39 #12 New Member   Isa.Ebtehaj Join Date: Nov 2012 Posts: 21 Rep Power: 6 YES This is a 2 phase flow then with air and water when iwan create CCL file this error showed: no objecte wee selected to export

 November 4, 2012, 16:40 #13 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 You might have to click on the flow analysis first.

 November 4, 2012, 16:48 #14 New Member   Isa.Ebtehaj Join Date: Nov 2012 Posts: 21 Rep Power: 6 that Error again show :No objected were selected to export ?? plz help me

 November 4, 2012, 17:08 #15 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 That is very odd. Anyone else experienced this? Open up the CFX Pre user guide and search for export CCL to make sure you are doing it properly.

 November 4, 2012, 17:17 #16 New Member   Isa.Ebtehaj Join Date: Nov 2012 Posts: 21 Rep Power: 6 this is link of CCL http://www.4shared.com/rar/kr4AmO8z/New_folder.html

 November 4, 2012, 17:22 #17 Senior Member   Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 388 Rep Power: 8 Can you post another way (even just copy and paste) so I don't have to sign up for that site to download?

 November 4, 2012, 17:28 #18 New Member   Isa.Ebtehaj Join Date: Nov 2012 Posts: 21 Rep Power: 6 aaw.jpg ccl

 November 5, 2012, 03:42 #19 New Member   Kyriakos Vafiadis Join Date: Feb 2011 Location: Kozani, Greece Posts: 29 Rep Power: 8 jahetbe this is not the ccl and from this screenshot nothing is clear. export ccl and you got to select all the items of interest... inlet, outlet, etc. ccl is text. Also post a picture of what you are studying, your geometry. I am 99% sure it's not a CFX bug, but a set up problem. It's very useful to try the tutorials. __________________ -- Kyriakos Vafiadis Mechanical Engineer, PhD candidate

November 5, 2012, 06:08
#20
Super Moderator

Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 13,737
Rep Power: 106
Quote:
 Wow, a lot of people posting this week about error 255.
That's why we wrote the FAQs - this one is relevant: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F

The FAQ might need a bit of a tweak to make it clear that it applies to 255 errors as well.

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