# Calculation of integral boundary values

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

 March 17, 2005, 09:10 This is the fix. http://ww #21 Senior Member   Mattijs Janssens Join Date: Mar 2009 Posts: 1,419 Rep Power: 26 This is the fix. SortableList.C

 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: 17 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, 11:29 Dear all, Keeping the idea #23 Senior Member   Cedric DUPRAT Join Date: Mar 2009 Location: Nantes, France Posts: 195 Rep Power: 17 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: 190 Rep Power: 17 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: 16
Hello,

I have a question about the code you have posted here.
Does it calculate Mass Flux or Mass flow rate ?

Thanks
Vaidya

Quote:
 Originally Posted by mattijs Hello Jarrod, we located found the problem in SortableList. It is because setSize when it grows the list does not adapt the list of indices. Until we fix it you can work around it by creating your list big enough and shrinking it (i.e. setSize with something smaller than the current size) Mattijs

 March 30, 2013, 14:11 #26 Senior Member     Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26 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   Join Date: Dec 2011 Posts: 111 Rep Power: 19 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: 2,208 Rep Power: 26 i didn't received a related answer yet.

 March 31, 2013, 07:12 #29 Senior Member     Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26 i didn't received a related answer yet.

 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 Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Bloshchitsyn Vladimir CFX 0 November 18, 2007 22:19 aunola Main CFD Forum 0 May 8, 2006 07:54 CFDtoy Main CFD Forum 0 October 5, 2004 13:08 StarCD Siemens 2 May 24, 2004 14:33 R.Sripriya FLUENT 4 June 12, 2003 12:49

All times are GMT -4. The time now is 11:37.