periodic shadow faces
Hello,
I will be grateful if someone could explain me how to deal with periodic grids in FLUENT. I have created periodic grid in GAMBIT, where everything was going without problems, but mesh check failes in FLUENT. Could someone advice me what is the problem. I was asking people on GAMBIT subforum http://www.cfdonline.com/Forums/ans...riodicbc.html but it seems that they cannot help. The fluent mesh check shows nonexistant (x,y)periodic translations: Mesh Check Domain Extents: xcoordinate: min (m) = 0.000000e+000, max (m) = 1.000000e+000 ycoordinate: min (m) = 0.000000e+000, max (m) = 1.000000e+000 zcoordinate: min (m) = 0.000000e+000, max (m) = 1.000000e+000 Volume statistics: minimum volume (m3): 3.333333e004 maximum volume (m3): 5.684532e003 total volume (m3): 1.000000e+000 Face area statistics: minimum face area (m2): 1.000000e003 maximum face area (m2): 6.757963e002 Checking number of nodes per cell. Checking number of faces per cell. Checking thread pointers. Checking number of cells per face. Checking face cells. Checking cell connectivity. Checking bridge faces. Checking righthanded cells. Checking face handedness. Checking face node order. Checking closed cells. Checking contact points. Checking element type consistency. Checking boundary types: Checking face pairs. Checking wall distance. Checking node count. Checking nosolve cell count. Checking nosolve face count. Checking face children. Checking cell children. Checking storage. Checking periodic boundaries. Periodic zone 3: xtranslation: min (m) = 1.284619e001, max (m) = 2.012138e001 ytranslation: min (m) = 1.674896e001, max (m) = 1.632244e001 ztranslation: min (m) = 1.000000e+000, max (m) = 1.000000e+000 Done. WARNING: Mesh check failed. Thanks in advance Truffaldino 
if it can help....
Fluent side: http://my.fit.edu/itresources/manual...ug/node262.htm http://my.fit.edu/itresources/manual...ug/node179.htm http://my.fit.edu/itresources/manual...ug/node180.htm and one tutorial http://my.fit.edu/itresources/manual.../tg/node23.htm Gambit side: http://my.fit.edu/itresources/manual...e/mg04.htm#777 
There should be no problem in Fluent if periodicity is correctly defined in Gambit. I wonder if you connected the faces periodically in Gambit i.e., if you select/mesh one face, the other one should get selected/meshed automatically. Also, the order (arrow direction) of edge selection when connecting the periodic faces should be the same for both the faces. If you took care of these things already, then I am not sure if this is some other problem. As you mentioned, the extents for X and Y seem strange.

Thanks guys, Thanks a lot mAx,
The problem is fixed and eliminated shadow faces are reordered with the help of the manual given by mAx in the link: http://my.fit.edu/itresources/manual...ug/node180.htm Fluent command grid http://my.fit.edu/itresources/manual.../ug/img463.gif modifyzones http://my.fit.edu/itresources/manual.../ug/img464.gif repairperiodic eliminates unexistent translations! : /mesh/modifyzones> repairperiodic Periodic zone [()] periodic Repair translational periodic zone? [yes] y computed translation deltas: 0.000000 0.000000 1.000000 reordered 163 periodic shadow faces I am still wandering what was wrong with GAMBIT? Thanks again Truffaldino 
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