
[Sponsors] 
March 17, 2005, 10:10 
This is the fix.
http://ww

#21 
Super Moderator
Mattijs Janssens
Join Date: Mar 2009
Posts: 1,416
Rep Power: 16 

April 19, 2005, 12:25 
The algorithm posted by Jarrod

#22 
Member
Ali Heidari
Join Date: Mar 2009
Location: Surrey, London, United Kingdom
Posts: 39
Rep Power: 8 
The algorithm posted by Jarrod a few threads above (for evaluating flux at the patches such as inlet etc) works fine. But what if I have a channel of say length L=1 (from x=0 to x=1) and I want to calculate flux through the middle point (x=0.5). How do I introduce a face at x=0.5 which is not a boundary patch? I found the velocities at the middle to be more accurate, so I thought calculating flux at the middle would be better. inlet flux changes its sign while it shouldn't be like that. I guess something may be wrong there.


January 14, 2009, 12:29 
Dear all,
Keeping the idea

#23 
Senior Member
Cedric DUPRAT
Join Date: Mar 2009
Location: Belgium
Posts: 179
Rep Power: 8 
Dear all,
Keeping the idea of Ali, I need to calculate a mass flow average throught a plane in my geometry. I'll like also to define this plane (coordinate, ect...) after my calculation because I can't guess the result. I use these few lines to create a plane inside the geometry where I can get every value I need. // Plane 1 point pnt(0,0,0); vector direction(0,0,1); plane pl1(pnt,direction); cuttingPlane cutPlane1(mesh,pl1); const labelList& cutCells1 = cutPlane1.cells(); word setName("someCells"); cellSet currentSet1(mesh, setName, cutCells1); // Create mesh subsetting engine fvMeshSubset subsetter1(mesh); label patchI = 1; subsetter1.setLargeCellSubset(currentSet1, patchI, true); But, how can I use them to define a patch like boundary patch which wouldn't be at the boundary of my geometry ? So I could use previous piece of code to get different value like mass flow average or pressure average, ect ... Thank you for your help, Cedric 

September 9, 2009, 07:44 

#24 
Senior Member
Aram Amouzandeh
Join Date: Mar 2009
Location: Vienna, Vienna, Austria
Posts: 186
Rep Power: 8 
dear all!!
added the posted codes to chtMultiRegionFoam to get the net mass flux in the fluid region(s). it compiles but giving me the following warnings: ************************************************** ******************************* fluid/setRegionFluidFields.H: In function ‘int main(int, char**)’: fluid/setRegionFluidFields.H:1: warning: unused variable ‘mesh’ fluid/setRegionFluidFields.H:5: warning: unused variable ‘K’ fluid/setRegionFluidFields.H:6: warning: unused variable ‘U’ fluid/setRegionFluidFields.H:7: warning: unused variable ‘phi’ fluid/setRegionFluidFields.H:8: warning: unused variable ‘g’ fluid/setRegionFluidFields.H:10: warning: unused variable ‘turb’ fluid/setRegionFluidFields.H:11: warning: unused variable ‘DpDt’ fluid/setRegionFluidFields.H:14: warning: unused variable ‘psi’ fluid/setRegionFluidFields.H:15: warning: unused variable ‘h ************************************************** ******************************* but the code is running. should I stil care about the warnings?? greatly appreciate your comments! aram 

April 21, 2010, 14:10 
Is this mass flux or mass flow rate ?

#25  
New Member
sankarv
Join Date: Feb 2010
Posts: 26
Rep Power: 7 
Hello,
I have a question about the code you have posted here. Does it calculate Mass Flux or Mass flow rate ? Thanks Vaidya Quote:


March 30, 2013, 15:11 

#26 
Senior Member
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,207
Rep Power: 18 
hi
I have a question about about where should we add the includes and their related headers? 

March 31, 2013, 06:12 

#27 
Senior Member
Håkon Strandenes
Join Date: Dec 2011
Location: Norway
Posts: 111
Rep Power: 11 
immortality: Have you heard about the phrase thread necromancy before?
I really think it is bad practice to post the same question twice on the same forum at the same time. Post it once, and wait for answer. 

March 31, 2013, 07:06 

#28 
Senior Member
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,207
Rep Power: 18 
i didn't received a related answer yet.


March 31, 2013, 07:12 

#29 
Senior Member
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,207
Rep Power: 18 
i didn't received a related answer yet.


Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Surface integral calculation by undefined area  Bloshchitsyn Vladimir  CFX  0  November 18, 2007 23:19 
Evaluation of boundary integral  aunola  Main CFD Forum  0  May 8, 2006 07:54 
Boundary Integral Method  CFDtoy  Main CFD Forum  0  October 5, 2004 13:08 
Boundary integral parameters  StarCD  CDadapco  2  May 24, 2004 14:33 
Calculation of lagrangian integral time scale  R.Sripriya  FLUENT  4  June 12, 2003 12:49 