# Fixed temperature for domain

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

 May 26, 2009, 19:02 Fixed temperature for domain #1 New Member   Join Date: Mar 2009 Posts: 24 Rep Power: 10 Sponsored Links Hello, I wounder how to apply a fixed temperature to a domain in CFX-Pre? For a boundary condition (2D), there is an option to give a fixed temperature. For a domain (3D), I created a subdomin for the domain (but actually, the submain is the same as the domain). However, there is no option for giving a fixed temperature over the domain. Please let me know how to deal with this problem. Thank you very much. Jaho

 May 30, 2009, 12:25 #2 New Member   Join Date: Mar 2009 Posts: 13 Rep Power: 10 You can do an isothermal analysis and set the domain temperature (Domain->Fluid Models->Heal Transfer->Isothermal). But if you have a multidomain situation, then all the domains will be isothermal. You cannot set the temperature for one domain and solve the Energy Equation for another one.

 May 31, 2009, 19:08 #3 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,735 Rep Power: 106 Hi, Can you explain why you want one domain to be fixed temperature? Glenn Horrocks

 June 1, 2009, 10:07 #4 New Member   Join Date: Mar 2009 Posts: 24 Rep Power: 10 Thank you, Zef. It's helpful. Have a great day!

 June 1, 2009, 10:10 #5 New Member   Join Date: Mar 2009 Posts: 24 Rep Power: 10 For steady state simulation, I wouldl like to set one domain to have a fixed temperature. Actually, one domain is sort of a heat source such as molten metal to be poured continously.

 June 1, 2009, 18:34 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,735 Rep Power: 106 Hi, If the region is fixed temperature then why model it at all? Why not just model its boundary on the domain you are modelling as a fixed temperature? Glenn Horrocks

 June 2, 2009, 10:36 #7 New Member   Join Date: Mar 2009 Posts: 24 Rep Power: 10 Thank you for your reply, Glenn. Glenn, I want to know how to model to give a fixed temp. for 3D domain instead of 2D boundary condition... Is there any way? Thanks

 June 2, 2009, 18:49 #8 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,735 Rep Power: 106 Hi, But if you assume it is a fixed temperature then you are not modelling anything so why bother? You can fix values using a heat equation source term to fix the temperature of a region to a value you define. This way you can set one region to have fixed temperature but elsewhere the temperature is calculated as normal. Is this what you want to do? Look in the documentation under source terms. Glenn Horrocks

 June 4, 2009, 13:21 #9 New Member   Join Date: Mar 2009 Posts: 24 Rep Power: 10 Hi Glenn, I am sorry for late reply. Thank you for your help and have a great day. Jaho

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Mihail CFX 7 September 7, 2014 06:27 Peter FLUENT 5 January 26, 2009 19:04 Oliver Siemens 4 September 8, 2008 07:22 oniboy Siemens 0 February 29, 2008 00:00 La S. Hyuck CFX 1 May 23, 2001 00:07