# nett source calculation

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 January 14, 2003, 08:40 nett source calculation #1 Russ Guest   Posts: n/a Can anybody please give me an explanation of how the nett sources are calculated in the results file. I have a formula of the sum of CO * ( VAL - VAR ) * "type multiplier". I am looking at an outlet and i'm unsure what values would be used for val and "tpye multiplier" in this case. Thanks In Advance Russ

 January 14, 2003, 13:13 Re: nett source calculation #2 cham Guest   Posts: n/a VAL will be the external pressure value, often zero, and the TYPE will be whatever appears in the Group 13 for this PATCH in the RESULT file, e.g. if VOLUME appears, then the cell volume is the multiplier. Thus, CO*(VAL-VAR)*VOLUME will be summed for all the cells in the PATCH, and the result printed in the RESULT file.

 January 15, 2003, 09:44 Re: nett source calculation #3 Russ Guest   Posts: n/a I am trying to recreate how this is calculated for velocities at an outlet. So my type multiplier is each cell area because the type is EAST. If I look in Group 13 of the result file this tells me that CO and VAL are zero. COVAL(OB2 ,U1 , 0.000000E+00, 0.000000E+00) Surely with the formula CO * ( VAL - VAR ) * "type multiplier" the nett sum would be zero. Is it the same formula that is used or am I not understanding what numbers go into it?

 January 16, 2003, 05:47 Re: nett source calculation #4 cham Guest   Posts: n/a The nett source for a generic variable F at an outlet boundary would be: S = TYPE*(CMASS*(VMASS-Pp)+CPHI(F))*(VPHI(F)-Fp) where Pp is the in-cell pressure, Fp is the in-cell value of F,and CMASS and VMASS are the CO and VAL for P1.

 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 Antony Phoenics 4 July 30, 2008 05:15 Amod Kumar CFX 0 August 28, 2006 04:28 galaad OpenFOAM Running, Solving & CFD 0 November 28, 2005 10:43 lego CFX 3 December 16, 2002 18:02 Marc Phoenics 1 April 24, 2002 10:55

All times are GMT -4. The time now is 19:37.

 Contact Us - CFD Online - Top