[ghorrocks]

I just want you to confirm that 88K is reasonable for a minimum temperature. It is very low and most people would not be modelling stuff at that temperature.

Please show a cross section of your mesh and your CCL file.

[Onig]

Now the prob solved when i corrected my mesh...Now when am running i am getting an error msg which says
The non-dimensional near wall temperature (T+) has been clipped |
| for calculation of Wall Heat Transfer Coefficient. |
| |
| Boundary Condition : ch innershell Side 1 2 |
| T+ clip value = 1.0000E-10 |
| |
| If this situation persists and you are using the High Speed Model, |
| consider enabling Mach number based blending between low speed and |
| high speed wall functions. You can do so by specifying a Mach |
| number threshold as follows: |
| |
| EXPERT PARAMETERS: |
| highspeed wf mach threshold = 0.1 # default=0.0 (off) |
| END

I have added this expert parameter but it is giving a global warning that

In Analysis 'Flow Analysis 1': One or more expert parameters have been enabled. Note that expert parameters are intended for use only by customers who are experienced in the use of CFX, or who have been instructed to use them by ANSYS Customer Support. Use of the parameters is not fully supported, and may have unexpected or unintended consequences both for the quality of results and the performance of the CFX-Solver.

So how to add this expert parameter

[Thomas MADELEINE]

that is not an error but just a warning. it appears when you enable any expert parameter (even quite simple one like relaxation term).
If you know what you are doing you can ignore it, if not be quite prudent and look for documentation.

[Onig]

but what i am using is not there in default parameters so i edited the CCL file.. ....When i process the CCL it doesnt show any error...but when solver starts running it shows that it cannot include the expert parameter

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| Errors were encountered in the CFX Command Language for this run: |
| |
| Error: Sub-object 'EXPERT PARAMETERS' is not allowed in / |
+--------------------------------------------------------------------+

[Thomas MADELEINE]

have you done the change on CFX-pre or CFX Solver directly ?

[Onig]

sorry for delayed reply...i have done in cfx pre

[Thomas MADELEINE]

well, i don't know what happend...
maybe the implementation of a new parameter only with CCL is quite bad
you can always try to add another expert parameter (like under-relaxation term) and see if the CCL is still good.

[Onig]

ok..now for the time being i am running without editing the CCL...how to tackle the error i am getting

Parallel run: Received message from slave
-----------------------------------------
Slave partition : 9
Slave routine : ErrAction
Master location : RCVBUF,MSGTAG=1016
Message label : 001100279
Message follows below - :

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Floating point exception: Overflow |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

Parallel run: Received message from slave
-----------------------------------------
Slave partition : 9
Slave routine : ErrAction
Master location : RCVBUF,MSGTAG=1016
Message label : 001100279
Message follows below - :

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine FPX: C_FPX_HANDLER |
| |
| |
| |
| |
| |

[ghorrocks]

FAQ: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F

[Onig]

Thank you. i will go through it

[Onig]

When i go thru u r link, in FSI portion it is mentioned that fluid - solid interaction has to be done seperatly. Fluid in CFX-Pre and solid in Work bench and club together...Is it ncessary ? I can do it in CFX-Pre itself rt by defining different domains and club by domain interface (Fluid -solid)??

[Onig]

hi
i want to know in particle distribution..what do you mean by rossin ramler size and power
if my SMD is 200...how to specify the above two parameters...

[Onig]

Originally Posted by ghorrocks

FAQ: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F

Hi
I need a simple help..i want to give that Hydrogen Cp (specific heat at const pr) varies with temp as i am using it as a coolant...How to give that or how to input

[ghorrocks]

Then make the Hydrogen Cp a function of temperature using a CEL expression or a 1D interpolation function.

[Onig]

Thank you..How to create shared library. I have written my fortran code and saved as filename.F...Now the documentation says the following...


A script called cfx5mkext is used to create shared libraries. You can run cfx5mkext -help for information on the arguments accepted by the script. To create the shared libraries execute:

cfx5mkext myroutine1.F


where to run ???? In which command line ???

Plssss help..

[Onig]

Originally Posted by ghorrocks

Then make the Hydrogen Cp a function of temperature using a CEL expression or a 1D interpolation function.

Pls see my last post on may 19

[Onig]

Originally Posted by Thomas MADELEINE

well, i don't know what happend...
maybe the implementation of a new parameter only with CCL is quite bad
you can always try to add another expert parameter (like under-relaxation term) and see if the CCL is still good.

ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Floating point exception: Zero divide |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine FPX: C_FPX_HANDLER |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 1. No results file |
| has been created. |
+--------------------------------------------------------------------+

I am getting this error at accumulated time step(doing a steady state combustion) where i asked to backup the results...When i gave at interval 10..error occurred after writing the backup results...When i gave 20s interval to backup result..error message occured at 20...Why?

Hoping for your help