CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Thermal conductivity issue

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 19, 2014, 10:21
Default Thermal conductivity issue
  #1
New Member
 
Jarda Chlup
Join Date: Aug 2013
Posts: 14
Rep Power: 3
Jared1986 is on a distinguished road
Hello,
I have trouble with thermal conductivity setting. I have a lot of solid domains, where I have to set thermal conductivity on cylindrical components, but these domains are in circular patern and axis, which I need for thermal conductivity setting, are rotating on cyrcle.Does anybody know if it is possible to set equation of circle like rotation axis for cylindrical coord?

Normal setting for cylindrical components is:

THERMAL CONDUCTIVITY:
Option = Orthotropic Cylindrical Components
Thermal Conductivity Axial Component = 5 [W m^-1 K^-1]
Thermal Conductivity Theta Component = 10 [W m^-1 K^-1]
Thermal Conductivity r Component = 15 [W m^-1 K^-1]
AXIS DEFINITION:
Option = Two Points
Rotation Axis From = 0 [m],0 [m],0 [m]
Rotation Axis To = 0 [m],0 [m],1 [m]
END
END

My situation
THERMAL CONDUCTIVITY:
Option = Orthotropic Cylindrical Components
Thermal Conductivity Axial Component = 5 [W m^-1 K^-1]
Thermal Conductivity Theta Component = 10 [W m^-1 K^-1]
Thermal Conductivity r Component = 15 [W m^-1 K^-1]
AXIS DEFINITION:
Option = Two Points
Rotation Axis From = (sqrt(y^2-R^2)) [m],(sqrt(x^2-R^2)) [m],0 [m]
Rotation Axis To = (sqrt(y^2-R^2)) [m],(sqrt(x^2-R^2)) [m],1 [m]
END
END

Where R is radius of circle.

But it's probably wrong syntax.

Does anybody have idea how is it possible to solve this issue?
Thanks a lot
Jared1986 is offline   Reply With Quote

Old   March 20, 2014, 03:03
Default
  #2
Senior Member
 
Bharath kumar
Join Date: Apr 2009
Posts: 157
Rep Power: 8
bharath is on a distinguished road
I think there is no problem in syntax.You are getting any error.
bharath is offline   Reply With Quote

Old   March 20, 2014, 06:11
Default
  #3
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,831
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
You have misintepreted the axis from/to fields. These fields define two points through which CFX places a line and that defines the axis. So this should have a constant x,y,z point, not a CEL expression.
ghorrocks is offline   Reply With Quote

Old   March 20, 2014, 11:38
Default
  #4
Senior Member
 
Edmund Singer P.E.
Join Date: Aug 2010
Location: Minneapolis, MN
Posts: 494
Rep Power: 11
singer1812 is on a distinguished road
Glenn is right. You have described an infinately varing material condition. You need to define a separate material property for each solid with each axis defined through the set centerline of each solid.
singer1812 is offline   Reply With Quote

Reply

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
IAPWS water properties + orthotropic thermal conductivity Chander CFX 1 February 29, 2012 18:26
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
Porous Media Effective Thermal Conductivity Greg Perkins FLUENT 3 August 5, 2001 21:53
Info: Short Course On Thermal Design of Electronic Equipment Arnold Free Main CFD Forum 0 August 10, 1999 10:18


All times are GMT -4. The time now is 01:42.