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May 4, 2011, 03:20 |
anisotropic material in CFX R13.0
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#1 |
Senior Member
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Hi everyone,
I have a problem with defining anisotropic material in the last release of CFX. I need to define thermal conductivity for each coordinate axis in specific value but I didn't succeed. I tried to edit material in command editor using expression : THERMAL CONDUCTIVITY: Option = Orthotropic Cartesian Components Thermal Conductivity X Component = 29 [W m^-1 K^-1] Thermal Conductivity Y Component = 29 [W m^-1 K^-1] Thermal Conductivity Z Component = 10 [W m^-1 K^-1] END But it doesn't work.. Please can anyone help me?? All suggestions are appreciated. Thanks a lot |
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May 4, 2011, 09:42 |
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#2 |
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Attesz
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This ccl seems to be ok, what is your error message?
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May 5, 2011, 02:16 |
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#3 |
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Error message says that only allowed options are: value or kinetic theory model.
This ccl used to work in release 10 and 11 but it doesn't work in the latest release. |
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May 11, 2011, 04:59 |
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#4 |
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Is it possible to define this property by some expression??
Does anybody know how to define expression like f=(x,y,z) when I have defined x,y and z components?? |
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May 11, 2011, 06:37 |
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#5 |
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Glenn Horrocks
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You can use a 3D interpolation function, if that is what you mean. If you want to set up a function like can be defined in fortran which returns a value, no this cannot be done in CEL. You will need user fortran for that.
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May 11, 2011, 06:47 |
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#6 |
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I have defined thermal conductivity in x,y and z direction by using expression..
cond x = .... W m^-1 K^-1 cond y = ....W m^-1 K^-1 cond z = ....W m^-1 K^-1 And now I would like to define an expression which includes these three expressions as its components (x,y,z). Is it possible to define it this way?? |
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May 17, 2011, 10:41 |
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#7 |
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If somebody is interested the problem can be solved by using command line in CFX Launcher > Tools > Command line using command:
cfx5cmds -read -def ________.def -text ______.txt which transforms def file into text file. Then by simple opening by notepad and modifying property as mentioned before you can modify this txt file and using command cfx5cmds -write -def ________.def -text ______.txt you will obtain modified def file with desired modifications. Hope it will help someone..... Good luck with your simulations |
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June 22, 2011, 05:15 |
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#8 |
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you could also keep your anisotropy infos in a seperate .ccl and start the solver like this:
cfx5solve.exe -def yoursimulation.def -ccl youranisomaterial.ccl youranisomaterial.ccl would contain the entire material definition including the "replace" command and of course the values. LIBRARY: &replace MATERIAL: Copper Material Group = ... ... ... THERMAL CONDUCTIVITY: Option = Orthotropic Cartesian Components Thermal Conductivity X Component = ... ... ... END |
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May 30, 2012, 04:49 |
error message sustained
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#9 |
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Dear keeper, noslip,
i've met with an error message while trying to perform the steps you've recommended. the error message is attached as JPEG here. would you mind helping me to find out what else could i have done wrong in the setup please?
__________________
Thank you for your kind attention. Kind regards, mactech001 Currently using: ANSYS v13 |
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May 30, 2012, 11:53 |
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#10 |
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sorry I cant recognize much from your jpg. Could you attach out or txt file of your simulation please?
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November 6, 2012, 11:54 |
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#11 |
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In case anyone still needs this, here's the ccl I received from ANSYS customer support:
LIBRARY: &replace MATERIAL: Anyso Material Group = User Option = Pure Substance Thermodynamic State = Solid PROPERTIES: Option = General Material EQUATION OF STATE: Density = 2.645E3 [kg m^-3] Molar Mass = 1 [kg kmol^-1] Option = Value END REFERENCE STATE: Option = Specified Point Reference Specific Enthalpy = 0 [J kg^-1] Reference Temperature = 25 [C] END SPECIFIC HEAT CAPACITY: Option = Value Specific Heat Capacity = 1.36E3 [J kg^-1 K^-1] END THERMAL CONDUCTIVITY: Option = Orthotropic Cartesian Components Thermal Conductivity X Component = 0.001 [W m^-1 K^-1] Thermal Conductivity Y Component = 500 [W m^-1 K^-1] Thermal Conductivity Z Component = 5 [W m^-1 K^-1] #Thermal Conductivity = 175 [W m^-1 K^-1] AXIS DEFINITION: Option = Coordinate Axis Rotation Axis = Coord 0.3 END END END END END |
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November 16, 2012, 13:51 |
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#12 | |
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Quote:
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December 25, 2012, 11:36 |
Stopped in routine DEF_DIFMOLC
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#13 |
New Member
Anonymous
Join Date: Dec 2012
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Thanks for the above suggestions. I have defined anisotropy as suggested. But I got the following error. Can any help in resolving this?
+--------------------------------------------------------------------+ | Writing crash recovery file | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | ERROR #001100279 has occurred in subroutine ErrAction. | | Message: | | Stopped in routine DEF_DIFMOLC | | | | | | | | | | | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | An error has occurred in cfx5solve: | | | | The ANSYS CFX solver exited with return code 1. No results file | | has been created. | +--------------------------------------------------------------------+ |
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December 26, 2012, 04:53 |
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#14 |
Super Moderator
Glenn Horrocks
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CFX does give some horrible crytic error messages sometimes.
This error might be associated with something to do with molecular diffusion. You probably have some physics defined which requires a material property (associated with diffusion I am guessing) which is not defined so it bombs out with and error. I would simplify your model until it starts working. Then add the physics one bit at a time until it crashes - then you know what is causing the problem. |
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December 26, 2012, 06:11 |
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#15 |
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Anonymous
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The problem is simple, There is cube inside air flow. Flow in X direction. The cube has heat generatlion. First case I have defined isotropic conductivity. The problem ran fine.
Then in the second run I have introduced the anisotropic material properties as mentioned in above threads. Then I got this error after single interation. I am using CFX 11 |
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December 26, 2012, 06:14 |
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#16 |
Super Moderator
Glenn Horrocks
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So it is a statement of the obvious that the problem is with the way you set the anisotropic material properties. Note that I think this is a beta feature in CFX which means they might have changed the CCL structure from what you see here. THe best way to get it working is to contact CFX support and get the CCL structure for it.
Also you will find support will probably not support V11, the current version is V14.5. So you should consider upgrading. |
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February 7, 2013, 04:54 |
K(T)
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#17 | |
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Mina
Join Date: Apr 2011
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Quote:
I want to define thermal conductivity as a function of temperature. is that possible to do in CFX? indeed i am simulating conjugated heat transfer in CFX and i have solid part which is steel and by default there is value corresponding to 25 C however i need to give the properties as a function of temperature. Is that possible ? solid part in my case is embedded inside a combustion chamber and the flow inside that is meant for cooling therefore the temperature gradient in the solid is quite important for us if we can't define material varying by temperature this temperature gradient has no sense,. |
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February 7, 2013, 04:57 |
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#18 |
Super Moderator
Glenn Horrocks
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I am pretty sure that will work. Just try it and if it does not work it will tell you.
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February 7, 2013, 05:00 |
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#19 |
Member
Mina
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I can define it as function of (x,y,z) but not as a function of temperature since the temperature is variable and it will be calculated during the simulation so i am not sure how to do that.
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February 7, 2013, 05:13 |
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#20 |
Super Moderator
Glenn Horrocks
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Is the thermal conductivity just a function of temperature, or of other things as well? In fact, can you post the function you are trying to use?
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