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

User Subroutine ----- sorent

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 24, 2008, 02:26
Default User Subroutine ----- sorent
  #1
conglin
Guest
 
Posts: n/a
In the head of soren subroutine, it says "This subroutine enables the user to specify a source term (per unit volume) for enthalpy in linearized form:

Source = S1P-S2P*T, (W/m3)".

Why the unit is "w/m3"? Shouldn't enthalpy be J/kg?What does "per unit volume" mean? Should I define enthalpy (H) as:

H = f(T)/ VOLP ?

VOLP-----volume of the cell (m3).

  Reply With Quote

Old   November 24, 2008, 13:37
Default Re: User Subroutine ----- sorent
  #2
ab
Guest
 
Posts: n/a
w/m3 is rate energy is added per unit volume (in this case a unit volume is a cubic meter). A watt is just one joule per second... using joules would have no meaning in a steady state simulation, because time in infinite.
  Reply With Quote

Old   November 24, 2008, 21:45
Default Re: User Subroutine ----- sorent
  #3
conglin
Guest
 
Posts: n/a
Thank you, ad. I very appreciate your answer.

In the letter,it said"using joules would have no meaning in a steady state simulation,because time in infinite." Do you mean that the sorent subroutine must be sued in a transient simulation?

"in this case a unit volume is a cubic meter", and "the case" mesns the example equation-----"Source = S1P-S2P*T" or all the expressions used in this subroutine? If answer is the latter, then should I difine the source as:

Source = H/VOLP = (S1P-S2P*T)/VOLP ?

H ----- enthalpy,

VOLP ----- volume of the cell in my mold.

Regards.

conglin

  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
How can I call EM in subroutine-----sorent.f conglin CD-adapco 1 November 28, 2008 12:12
User Subroutine A. Said CFX 9 March 7, 2008 16:49
User Subroutine Garryx CD-adapco 1 June 25, 2005 00:13
subroutine sorent.f Peter CD-adapco 5 April 15, 2004 01:25
User subroutine Don Baker CD-adapco 1 September 29, 2002 12:27


All times are GMT -4. The time now is 13:56.