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June 18, 2008, 14:16 |
how to set periodic boundary conditions
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#1 |
Guest
Posts: n/a
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I have a problem in specifying periodic boundary conditions. The model I'm using is a section of a rectangular block with holes in it. The face to be patterned was specified as symmetric boundary condition when I modeled it in Gambit. there are two such faces parallel to each other. Periodic boundary condition is not highlighted in the define panel. I will be thankful to anyone who can tell me where I made a mistake.
I also tried to change the boundary condition of these faces to interface and grid interface these two faces with periodic type. When I iterate, it say "no periodic zones adjacent to grid interface" |
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July 27, 2008, 03:26 |
Re: how to set periodic boundary conditions
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#2 |
Guest
Posts: n/a
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which software you are using.
Regards |
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March 2, 2010, 18:50 |
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#3 |
New Member
James
Join Date: Dec 2009
Location: Nashville, TN
Posts: 21
Rep Power: 16 |
It is ok to export the mesh out of GAMBIT with symmetric BCs,
because you (can) re-define them in FLUENT. I believe for FLUENT you set the Periodic BC to Interfaces under "Boundary Conditions" then under "Mesh Interfaces" you select the two Interfaces and set them to Periodic |
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March 3, 2010, 12:17 |
define in Gambit first
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#4 |
New Member
limin
Join Date: May 2009
Posts: 21
Rep Power: 17 |
Define in Gambit first, and import into fluent
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March 3, 2010, 20:32 |
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#5 |
Senior Member
N/A
Join Date: Mar 2009
Posts: 189
Rep Power: 17 |
When you define periodic boundary conditions in gambit, you need to link mesh the two faces/edges together. Try doing it and then export the mesh.
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April 8, 2010, 06:18 |
how to do the operation of link mesh the two faces/edges together??
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#6 |
New Member
Krunal
Join Date: Mar 2010
Posts: 11
Rep Power: 16 |
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April 8, 2010, 10:20 |
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#7 |
New Member
James
Join Date: Dec 2009
Location: Nashville, TN
Posts: 21
Rep Power: 16 |
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April 9, 2010, 10:20 |
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#8 |
Senior Member
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If your problem is 3D then go to face mesh options
In 2nd row (by right clicking) you will see the link face mesh. Select the faces on both sides of periodic boundary and choose option of periodic (also select reverse direction if need be) and then set boundary contions of periodic in boundary conditon panel hope it helps |
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April 28, 2011, 05:18 |
if my problem is 2d then??
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#9 |
New Member
Sukanta Roy
Join Date: Nov 2010
Posts: 2
Rep Power: 0 |
i have a problem with 2d savonius rotor. I am trying to create periodic zones. now i want to know how to create shadow in gambit so that when we import in the fluent we can create periodic zones and delete the shadow zone.
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June 13, 2011, 15:09 |
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#10 |
New Member
Alex Hai
Join Date: Mar 2010
Posts: 27
Rep Power: 16 |
I am simulating a moving 2-D droplet using Fluent 6.3, and i am using the translational periodic boundary condition so that when the droplet moves to the right boundary at the end of the domain it will re-appear on the left side of the domain. The problem i am facing is that when the droplet moves to the lower right side boundary, it re-appear on the upper left side boundary. So basically it translational on both X- and Y- axis.
How can i make it translational only in the X-Axis. Thanks. |
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September 4, 2011, 22:55 |
help me pelase!!
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#11 |
Senior Member
teguh hady
Join Date: Aug 2009
Location: Saga, Japan
Posts: 222
Rep Power: 18 |
Dear all,
I have problems with periodic BC too. I want to remake geometry of mixing plane. So i import the fanstage.msh into GAMBIT. I have meshed and specified the fan. but when i export to FLUENT there are errors. I don't know how to fix it. Help me please!! thanks you so much. Teguh &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& &&&&&&& Here is the *.jou file / Journal File for GAMBIT 2.4.6, Database 2.4.4, ntx86 SP2007051421 / Identifier "bismillah fan" / File opened for write Sun Sep 04 17:07:14 2011. face create radius 0.103 xyplane circle face create radius 0.14 xyplane circle face subtract "face.2" faces "face.1" window modify shade vertex create coordinates 0 0 0 edge create straight "vertex.4" "vertex.2" edge cmove "edge.4" multiple 1 dangle 40 vector 0 0 1 origin 0 0 0 face split "face.2" edges "edge.4" face split "face.2" edges "edge.5" window modify shade face delete "face.2" lowertopology save volume create translate "face.3" vector 0 0 -0.1165 window modify shade vertex create coordinates 0 0 0 vertex cmove "vertex.13" multiple 1 offset 0 0 -1.5 face create radius 0.14 xyplane circle undo /Undone to: face create radius 0.14 xyplane circle vertex cmove "vertex.14" multiple 1 offset 0.1 0 0 vertex cmove "vertex.14" multiple 1 offset 0 0.1 0 coordinate create cartesian vertices "vertex.14" "vertex.15" "vertex.16" face create radius 0.14 xyplane circle face create radius 0.103 xyplane circle face subtract "face.9" faces "face.10" window modify shade edge create straight "vertex.19" "vertex.17" edge summarize "edge.21" edge delete "edge.18" "edge.20" "edge.21" lowertopology edge create straight "vertex.14" "vertex.17" edge cmove "edge.21" multiple 1 dangle 30 vector 0 0 1 origin 0 0 0 face split "face.9" edges "edge.21" face split "face.9" edges "edge.22" window modify shade face delete "face.9" lowertopology vertex delete "vertex.16" volume create translate "face.10" vector 0 0 -0.1865 window modify shade volume move "volume.2" offset 0 0 1.5 edge summarize "edge.17" volume move "volume.2" offset 0 0 -0.1165 volume move "volume.2" dangle 5 vector 0 0 1 origin 0 0 0 volume move "volume.1" "volume.2" dangle -20 vector 0 0 1 origin 0 0 0 volume move "volume.1" "volume.2" dangle 90 vector 0 0 1 origin 0 0 0 save name "bismillah fan 1.dbs" import iceminput "D:\\FLUENT LATIHAN\\Belajar Thesis\\fanstage\\naca1412.txt" \ edge edge cscale "edge.35" multiple 1 factor 0.1 origin 0 0 0 edge cscale "edge.36" multiple 1 factor 0.1 origin 0 0 0 undo /Undone to: edge cscale "edge.36" multiple 1 factor 0.1 origin 0 0 0 undo /Undone to: edge cscale "edge.35" multiple 1 factor 0.1 origin 0 0 0 edge cscale "edge.35" multiple 1 factor 0.05 origin 0 0 0 edge cmove "edge.36" multiple 1 dangle 90 vector 0 1 0 origin 0 0 0 edge cmove "edge.37" multiple 1 dangle 90 vector 0 0 1 origin 0 0 0 edge delete "edge.38" lowertopology edge delete "edge.35" lowertopology edge delete "edge.36" lowertopology edge create straight "vertex.65" "vertex.66" /ERROR occurred in the next command! face create wireframe "edge.37" real face create wireframe "edge.37" "edge.38" real face cmove "face.16" multiple 1 offset 0 0 1.5 window modify shade face cmove "face.17" multiple 1 dangle 90 vector 1 0 0 origin 0 0 0 window modify shade face delete "face.18" lowertopology coordinate activate "c_sys.1" /ERROR occurred in the next command! volume create translate "face.17" vector 0 0 -0.1865 /ERROR occurred in the next command! volume create translate "face.17" vector 0 0 -0.1865 /ERROR occurred in the next command! volume create translate "face.17" vector 0 0 1 volume create translate "face.17" vector 1 0 0 window modify shade volume cmove "volume.3" multiple 1 dangle 90 vector 0 0 1 origin 0 0 0 window modify shade volume delete "volume.3" lowertopology face create width 0.5 xyplane rectangle face move "face.25" offset 0 0 -0.0705 volume split "volume.1" faces "face.25" connected window modify shade window modify noshade edge create straight "vertex.73" "vertex.74" "vertex.13" vertex create onedge "edge.64" percentarclength 0.7 vertex cmove "vertex.83" multiple 1 offset 0 0.1 0 vertex cmove "vertex.83" multiple 1 offset 0.1 0 0 coordinate create cartesian vertices "vertex.83" "vertex.85" "vertex.84" /ERROR occurred in the next command! face move "face.22" dangle 90 vector 0 1 0 origin 0 0 0 /ERROR occurred in the next command! face move "face.22" dangle 90 vector 0 1 0 origin 0 0 0 face cmove "face.22" multiple 1 dangle 90 vector 0 1 0 origin 0 0 0 undo /Undone to: face cmove "face.22" multiple 1 dangle 90 vector 0 1 0 origin 0 0 0 volume cmove "volume.4" multiple 1 dangle 90 vector 0 1 0 origin 0 0 0 volume delete "volume.4" lowertopology volume cmove "volume.6" multiple 1 dangle -5 vector 0 1 0 origin 0 0 0 volume cmove "volume.7" multiple 1 dangle -5 vector 0 1 0 origin 0 0 0 volume delete "volume.6" "volume.7" lowertopology edge summarize "edge.64" volume cmove "volume.8" multiple 1 offset 0 0 -0.05 volume cmove "volume.9" multiple 1 offset 0 0 -0.05 undo /Undone to: volume cmove "volume.9" multiple 1 offset 0 0 -0.05 volume cmove "volume.9" multiple 1 offset 0 0 -0.005 volume cmove "volume.10" multiple 1 offset 0 0 -0.005 volume cmove "volume.11" multiple 1 offset 0 0 -0.005 volume cmove "volume.12" multiple 1 offset 0 0 -0.005 volume delete "volume.10" "volume.9" "volume.11" "volume.12" lowertopology volume subtract "volume.1" volumes "volume.13" undo /Undone to: volume subtract "volume.1" volumes "volume.13" volume delete "volume.13" lowertopology volume cmove "volume.8" multiple 1 dangle -5 vector 0 0 1 origin 0 0 0 undo /Undone to: volume cmove "volume.8" multiple 1 dangle -5 vector 0 0 1 origin 0 0 volume cmove "volume.8" multiple 1 dangle 5 vector 0 0 1 origin 0 0 0 undo /Undone to: volume cmove "volume.8" multiple 1 dangle 5 vector 0 0 1 origin 0 0 0 volume cmove "volume.8" multiple 1 dangle -5 vector 0 0 1 origin 0 0 0 volume cmove "volume.9" multiple 1 offset 0 0 -0.005 undo /Undone to: volume cmove "volume.9" multiple 1 offset 0 0 -0.005 volume cmove "volume.9" multiple 1 offset 0 0 -0.05 volume cmove "volume.10" multiple 1 offset 0 0 -0.005 volume cmove "volume.11" multiple 1 offset 0 0 -0.005 volume cmove "volume.12" multiple 1 offset 0 0 -0.005 volume delete "volume.10" "volume.11" "volume.12" lowertopology volume subtract "volume.1" volumes "volume.13" undo /Undone to: volume subtract "volume.1" volumes "volume.13" undo /Undone to: volume delete "volume.10" "volume.11" "volume.12" lowertopology volume cmove "volume.13" multiple 1 offset 0 0 -0.005 volume cmove "volume.14" multiple 1 offset 0 0 -0.005 volume delete "volume.10" "volume.11" "volume.12" "volume.13" "volume.14" \ lowertopology volume subtract "volume.1" volumes "volume.15" window modify shade volume cmove "volume.9" multiple 1 dangle 90 vector 0 1 0 origin 0 0 0 volume cmove "volume.10" multiple 1 dangle 90 vector 0 1 0 origin 0 0 0 volume cmove "volume.11" multiple 1 dangle 90 vector 0 1 0 origin 0 0 0 window modify shade volume delete "volume.8" "volume.10" "volume.9" lowertopology volume cmove "volume.12" multiple 1 offset 0 0 -0.1 volume cmove "volume.13" multiple 1 offset 0 0 -0.1 volume delete "volume.13" lowertopology volume subtract "volume.2" volumes "volume.14" volume delete "volume.11" "volume.12" lowertopology volume delete "volume.5" "volume.1" window modify noshade face delete "face.27" "face.5" lowertopology face delete "face.28" "face.8" lowertopology face delete "face.25" lowertopology window modify shade face create wireframe "edge.4" "edge.15" "edge.58" "edge.10" "edge.56" \ "edge.14" real window modify shade window modify noshade face create wireframe "edge.16" "edge.55" "edge.13" "edge.57" "edge.17" \ "edge.9" real volume create stitch "face.3" "face.6" "face.29" "face.7" "face.26" "face.70" \ "face.92" "face.93" "face.4" real vertex delete "vertex.15" "vertex.17" "vertex.19" "vertex.22" "vertex.23" \ "vertex.2" "vertex.3" "vertex.7" "vertex.8" "vertex.13" "vertex.73" \ "vertex.74" "vertex.83" "vertex.84" "vertex.85" "vertex.80" "vertex.82" undo begingroup edge picklink "edge.5" edge mesh "edge.5" successive ratio1 1 intervals 15 undo endgroup undo begingroup edge picklink "edge.7" edge mesh "edge.7" successive ratio1 1 intervals 30 undo endgroup undo begingroup edge picklink "edge.9" edge mesh "edge.9" successive ratio1 1 intervals 5 undo endgroup undo begingroup edge delete "edge.9" "edge.4" keepsettings onlymesh edge mesh "edge.9" "edge.4" successive ratio1 1 intervals 5 undo endgroup undo begingroup edge delete "edge.5" "edge.14" "edge.16" keepsettings onlymesh edge mesh "edge.5" "edge.14" "edge.16" successive ratio1 1 intervals 15 undo endgroup undo begingroup edge delete "edge.16" "edge.17" "edge.15" keepsettings onlymesh edge picklink "edge.15" "edge.17" "edge.16" edge mesh "edge.16" "edge.17" "edge.15" successive ratio1 1 intervals 15 undo endgroup undo begingroup edge delete "edge.56" keepsettings onlymesh edge picklink "edge.56" edge mesh "edge.56" successive ratio1 1 intervals 10 undo endgroup undo begingroup edge delete "edge.56" "edge.55" "edge.57" "edge.58" keepsettings onlymesh edge mesh "edge.56" "edge.55" "edge.57" "edge.58" successive ratio1 1 \ intervals 10 undo endgroup undo begingroup edge delete "edge.5" "edge.59" keepsettings onlymesh edge mesh "edge.5" "edge.59" successive ratio1 1 intervals 15 undo endgroup undo begingroup edge delete "edge.7" "edge.62" keepsettings onlymesh edge mesh "edge.7" "edge.62" successive ratio1 1 intervals 30 undo endgroup undo begingroup edge picklink "edge.128" "edge.125" edge mesh "edge.125" "edge.128" successive ratio1 1 intervals 5 undo endgroup undo begingroup edge delete "edge.128" "edge.125" keepsettings onlymesh edge mesh "edge.128" "edge.125" successive ratio1 1 intervals 10 undo endgroup undo begingroup edge delete "edge.130" "edge.129" keepsettings onlymesh edge picklink "edge.129" "edge.130" edge mesh "edge.130" "edge.129" successive ratio1 1 intervals 30 undo endgroup undo begingroup edge delete "edge.9" "edge.13" "edge.10" keepsettings onlymesh edge mesh "edge.9" "edge.13" "edge.10" successive ratio1 1 intervals 5 undo endgroup undo begingroup edge delete "edge.10" "edge.21" "edge.26" keepsettings onlymesh edge picklink "edge.26" "edge.21" "edge.10" edge mesh "edge.10" "edge.21" "edge.26" successive ratio1 1 intervals 5 undo endgroup undo begingroup edge delete "edge.5" "edge.11" keepsettings onlymesh edge mesh "edge.5" "edge.11" successive ratio1 1 size 0.0047938377 undo endgroup undo begingroup edge delete "edge.62" "edge.12" keepsettings onlymesh edge picklink "edge.12" "edge.62" edge mesh "edge.62" "edge.12" successive ratio1 1 size 0.0032579479 undo endgroup undo begingroup edge delete "edge.22" keepsettings onlymesh edge picklink "edge.22" edge mesh "edge.22" successive ratio1 1 intervals 15 undo endgroup undo begingroup edge delete "edge.22" "edge.24" keepsettings onlymesh edge mesh "edge.22" "edge.24" successive ratio1 1 intervals 15 undo endgroup undo begingroup edge delete "edge.31" "edge.33" keepsettings onlymesh edge picklink "edge.33" "edge.31" edge mesh "edge.31" "edge.33" successive ratio1 1 intervals 35 undo endgroup undo begingroup edge delete "edge.33" "edge.31" "edge.34" "edge.32" keepsettings onlymesh edge mesh "edge.33" "edge.31" "edge.34" "edge.32" successive ratio1 1 \ intervals 35 undo endgroup undo begingroup edge delete "edge.26" "edge.21" "edge.10" "edge.30" "edge.27" keepsettings onlymesh edge mesh "edge.26" "edge.21" "edge.10" "edge.30" "edge.27" successive ratio1 \ 1 intervals 5 undo endgroup undo begingroup edge delete "edge.24" "edge.29" "edge.28" keepsettings onlymesh edge picklink "edge.28" "edge.29" "edge.24" edge mesh "edge.24" "edge.29" "edge.28" successive ratio1 1 intervals 15 undo endgroup undo begingroup edge delete "edge.129" "edge.130" "edge.166" "edge.165" keepsettings onlymesh edge mesh "edge.129" "edge.130" "edge.166" "edge.165" successive ratio1 1 \ intervals 30 undo endgroup undo begingroup edge delete "edge.128" "edge.125" "edge.162" "edge.163" keepsettings onlymesh edge mesh "edge.128" "edge.125" "edge.162" "edge.163" successive ratio1 1 \ intervals 10 undo endgroup undo begingroup edge delete "edge.125" "edge.128" keepsettings onlymesh edge mesh "edge.125" "edge.128" successive ratio1 1 intervals 10 undo endgroup face mesh "face.3" "face.6" "face.10" "face.12" "face.13" "face.14" "face.15" \ "face.29" "face.4" "face.7" "face.26" "face.66" "face.70" "face.87" \ "face.91" "face.92" "face.93" triangle size 1 /ERROR occurred in the next command! volume mesh "volume.2" "volume.3" tetrahedral size 1 /ERROR occurred in the next command! volume mesh "volume.2" "volume.3" tetrahedral size 1 undo begingroup face delete "face.3" "face.6" "face.10" "face.12" "face.13" "face.14" \ "face.15" "face.29" "face.4" "face.7" "face.26" "face.66" "face.70" \ "face.87" "face.91" "face.92" "face.93" onlymesh face mesh "face.3" "face.6" "face.10" "face.12" "face.13" "face.14" "face.15" \ "face.29" "face.4" "face.7" "face.26" "face.66" "face.70" "face.87" \ "face.91" "face.92" "face.93" triangle size 0.01 undo endgroup /ERROR occurred in the next command! volume mesh "volume.2" "volume.3" tetrahedral size 1 /ERROR occurred in the next command! volume mesh "volume.2" tetrahedral face delete "face.3" "face.6" "face.10" "face.11" "face.12" "face.13" \ "face.14" "face.15" "face.29" "face.4" "face.7" "face.26" "face.66" \ "face.70" "face.87" "face.91" "face.92" "face.93" onlymesh undo begingroup edge delete "edge.166" "edge.165" keepsettings onlymesh edge picklink "edge.165" "edge.166" edge mesh "edge.166" "edge.165" successive ratio1 1 intervals 100 undo endgroup volume mesh "volume.2" tetrahedral undo begingroup edge delete "edge.129" "edge.130" keepsettings onlymesh edge mesh "edge.129" "edge.130" successive ratio1 1 intervals 100 undo endgroup volume mesh "volume.3" tetrahedral save name "bismillah fan 2.dbs" export fluent5 "bismillah fan 2.msh" edge delete "edge.130" "edge.129" "edge.62" "edge.59" "edge.58" "edge.56" \ "edge.12" "edge.11" "edge.10" "edge.32" "edge.31" "edge.22" "edge.21" \ "edge.24" "edge.15" "edge.14" "edge.5" "edge.4" "edge.7" lowertopology onlymesh undo /Undone to: edge delete "edge.130" "edge.129" "edge.62" "edge.59" "edge.58" "edge edge delete "edge.63" "edge.64" "edge.7" "edge.4" "edge.5" "edge.10" \ "edge.11" "edge.14" "edge.15" "edge.56" "edge.59" lowertopology face delete "face.16" lowertopology coordinate delete "c_sys.2" "c_sys.3" window modify invisible mesh physics create "SHADOW-23" btype "PERIODIC" face "face.15" physics create "PERIODIC-22" btype "PERIODIC" face "face.12" physics create "PRESSURE OUTLET STATOR" btype "PRESSURE_OUTLET" face \ "face.11" physics create "PRESSURE INLET STATOR" btype "PRESSURE_INLET" face "face.10" physics create "STATOR SHROUD" btype "WALL" face "face.14" physics create "STATOR BLADE" btype "WALL" face "face.91" "face.87" physics create "STATOR HUB" btype "WALL" face "face.13" physics create "SHADOW 12" btype "PERIODIC" face "face.93" physics create "PERIODIC 11" btype "PERIODIC" face "face.92" save physics create "PRESSURE INLET ROTOR" btype "PRESSURE_INLET" face "face.3" physics create "PRESSURE OUTLET ROTOR" btype "PRESSURE_OUTLET" face "face.4" physics create "ROTOR INLET HUB" btype "WALL" face "face.6" physics create "ROTOR BLADE" btype "WALL" face "face.70" "face.66" physics create "ROTOR SHROUD" btype "WALL" face "face.7" physics create "ROTOR INLET SHROUD" btype "WALL" face "face.29" physics create "ROTOR HUB" btype "WALL" face "face.26" physics create "FLUID ROTOR" ctype "FLUID" volume "volume.3" physics create "FLUID STATOR" ctype "FLUID" volume "volume.2" save /ERROR occurred in the next command! export fluent5 "bismillah fan 2.msh" physics modify "SHADOW-23" btype label "SHADOW-23A" face "face.15" /ERROR occurred in the next command! export fluent5 "bismillah fan 2.msh" physics modify "SHADOW-23A" btype label "SHADOWSTA" face "face.15" physics modify "PERIODIC-22" btype label "PERIODICSTA" face "face.12" physics modify "SHADOW 12" btype label "SHADOWROT" face "face.93" physics modify "PERIODIC 11" btype label "PERIODICROT" face "face.92" save &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& &&&
__________________
Now Or Never!!! |
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January 30, 2012, 07:20 |
sliding mesh
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#12 |
Member
Join Date: Jan 2012
Posts: 58
Rep Power: 14 |
hi
i am using sliding mesh technique 2D analysis for train moving in tunnel. but not able to work properly , can any body help me i had done following steps 1. made two separate models in gambit so that i can combine them in fluent 2. export them to fluent and fuse them their 3. checked grid , it was done now i had to use boundary conditions ( mesh motion) and grind interface, but i am not able to that. plz can any one tell me am i doing perfectly and how to proceed further. thanks |
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April 10, 2013, 00:44 |
Coefficient matrix for Finite Volume method with periodic boundary in x direction
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#13 |
New Member
siyamak
Join Date: Feb 2013
Location: Baton Rouge
Posts: 3
Rep Power: 13 |
Hello,
Help please! I wrote a 2D finite volume code for a rectangular using Neumann boundary in bottom, Dirichlet boundary at top and periodic boundary in x direction. I get some results and everything seems to be fine other than by results tilted toward right boundary and I'm assuming that is because of NOT applying correct periodic boundary condition. Could you please let me know how to build a coefficient matrix which have periodic boundary in x direction? I appreciate if anybody can help me with that. |
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January 22, 2014, 04:11 |
Concept of periodic conditions
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#14 |
Member
Join Date: Dec 2013
Posts: 53
Rep Power: 12 |
Hi,
How can we use same periodic conditions to 1.flow with a pressure drop,which is geometrically periodic in nature,and is not fully developed and also to 2.Flow with a pressure drop,and fully developed flow(like fully developed flow through circular pipe) Iam getting confused.Any body please clarify. |
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November 26, 2018, 11:26 |
periodic boundary
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#15 |
Member
Join Date: Aug 2018
Posts: 90
Rep Power: 8 |
Hi, I am new to CFD.I have created a 2D plate and set its inlet outlet as periodic. I want to have flow by using pressure diference. Anyone know how may I set it in fluent? Thanks!
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November 18, 2020, 06:09 |
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#16 | |
New Member
Fahmi
Join Date: Jan 2020
Location: Selangor,Malaysia
Posts: 1
Rep Power: 0 |
Quote:
By default, the periodic surfaces are assigned as "periodic" right? So, I need to change it to "interface"? Thanks |
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