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August 27, 2013, 13:05 
Error in solution using "Grid Interface"

#1 
Senior Member
Agustín Villa
Join Date: Apr 2013
Location: Brussels
Posts: 103
Rep Power: 5 
Hi everyone!
I have the next problem I'm simulating a duct, wich has an element at his upper side, who receives an amount of heat. Due to the shape of the internal elements of the duct, I had to mesh it in other file, and I've joined it using "Grid interface". I attach an image to explain the crosssection (scheme.png). I'm meshing twisted tapes inside ducts in order to see the heat transfer, how it is enhanced... for this reason, it is possible to see 5 zones inside the scheme:
I can run the case, but it could happen two things:
I don't know where the problem is. I create the interface ant it happens. I think it has to be the union between the faces, but I've tried to increase the number of crosssection along the tube, but with no good news. At first place, I run Fluent to create the grid interface, and I close it. After, I run it again to simulate. This is the load of the 2nd time: Code:
> rc d7p21t0.35_tube.weld.cas.gz Multicore processors detected. Processor affinity set! Reading " gunzip c \"d7p21t0.35_tube.weld.cas.gz\""... .......................................................................................... 3008880 hexahedral cells, zone 2, binary. 449280 hexahedral cells, zone 3, binary. 972000 hexahedral cells, zone 28, binary. 1836000 hexahedral cells, zone 29, binary. 1208160 quadrilateral interior faces, zone 1, binary. 498694 quadrilateral interior faces, zone 8, binary. 74464 quadrilateral interior faces, zone 12, binary. 8382600 quadrilateral interior faces, zone 14, binary. 161100 quadrilateral interior faces, zone 20, binary. 304300 quadrilateral interior faces, zone 26, binary. 2592000 quadrilateral interior faces, zone 27, binary. 5075640 quadrilateral interior faces, zone 30, binary. 112320 quadrilateral wall faces, zone 7, binary. 416 quadrilateral wall faces, zone 10, binary. 416 quadrilateral wall faces, zone 11, binary. 112320 quadrilateral wall faces, zone 15, binary. 143640 quadrilateral wall faces, zone 16, binary. 900 quadrilateral wall faces, zone 18, binary. 900 quadrilateral wall faces, zone 19, binary. 18360 quadrilateral wall faces, zone 21, binary. 18360 quadrilateral wall faces, zone 22, binary. 216000 quadrilateral wall faces, zone 23, binary. 1700 quadrilateral wall faces, zone 24, binary. 1700 quadrilateral wall faces, zone 25, binary. 18360 quadrilateral wall faces, zone 31, binary. 2786 quadrilateral pressureoutlet faces, zone 4, binary. 2786 quadrilateral velocityinlet faces, zone 5, binary. 172800 quadrilateral interface faces, zone 6, binary. 17280 quadrilateral interface faces, zone 9, binary. 162000 quadrilateral interface faces, zone 17, binary. 112320 shadow face pairs, binary. 18360 shadow face pairs, binary. 6765743 nodes, binary. 6765743 node flags, binary. Parallel variables... Building... grid, auto partitioning mesh by Principal Axes, distributing mesh pairs................, parts................, faces................, nodes................, shadow nodes................, cells................, materials, interface, domains, mixture zones, defaultinterior:001 defaultinterior secctape extrtapein extrtapeout tape_in seccfluid lamina fluid_in entrada salida laminashadow defaultinterior:030 defaultinterior.1 seccweld extrweldin extrweldout weld_lateral weld_abs weld_out secctube extrtubein extrtubeout tube_in tube_out weld_outshadow wall35 wall34 wall36 wall33 Skipping zone wall33shadow (not referenced by grid). wall32 Skipping zone wall32shadow (not referenced by grid). twisted fluido welding tubo grid interfaces, creating wall33shadow creating wall32shadow parallel, shell conduction zones, Done. Can you help me? Last edited by agustinvo; August 28, 2013 at 03:16. Reason: Add some stuff 

June 28, 2014, 13:45 
I have the same problem and don't understand it !!!

#2 
New Member
jbnad
Join Date: Jun 2014
Posts: 10
Rep Power: 4 
Hi augustin ,
did you find a solution to your problem , I have the same problem and don't understand it !!! 

June 28, 2014, 19:36 

#3 
Senior Member
Agustín Villa
Join Date: Apr 2013
Location: Brussels
Posts: 103
Rep Power: 5 
Hi!
Sorry, but I couldn't solve this problem. I think the best idea is to mesh all together. If you can mesh it allntogether by using another tool you would avoid this problem, otherwise I don't know how to do it. Good luck! 

June 29, 2014, 09:05 

#4 
New Member
jbnad
Join Date: Jun 2014
Posts: 10
Rep Power: 4 
Ok thanks for the answer, for information i have several part in my mesh and i achieved one assembly without problem.
after that i separate my assembly to change only one part, the problem occured during this step , i thougth it was a problem of cell separation ! 

January 20, 2015, 13:03 

#5  
Member
George Pichurov
Join Date: Jul 2010
Posts: 39
Rep Power: 8 
Quote:
Hi, can you explain what is the shape of the walls that you stitch with grid interface? I dont get it from the first figure. More to say, I am worried about skippin these 33 and 32 shadow walls at the second file read. Your interface surface probably contains inner loops that somehow fluent cannot handle. Can you check if this is your case? 

Tags 
bad interface, fluent, grid interface 
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