FLUENT Periodic Boundary Condition SOLVED + TUTORIAL

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 April 15, 2014, 06:25 #21 New Member   Xiaohua Li Join Date: Nov 2013 Posts: 11 Rep Power: 4 Thank you very much. I just face the problem. I hope it can help .

 July 30, 2014, 07:47 #22 New Member   moon Join Date: Feb 2012 Posts: 24 Rep Power: 6 Is there a way to implement periodic boundary condition with UDF ? thx

 August 14, 2014, 04:35 periodic boundries #23 Member   hashim chaudhry Join Date: Jun 2014 Location: turkey Posts: 46 Rep Power: 4 Hi all, I am simulating an axial fan in fluent with inlet and outlet duct for finding the fan curve, I have a confusion regarding the interfaces types should I have to make the interfaces with periodic boundary condition and if yes then what should I consider rotational or translational and how can I calculate the angle if I am considering rotational under the periodic boundary tab. Thanks in advance Hashim

 October 16, 2014, 01:58 #24 New Member   Musty Join Date: Oct 2013 Posts: 8 Rep Power: 5 This was Awesome!!! I just started to understand periodic boundary conditions and in my first shot I succeeded with help of this topic, Thank you very much Peter! Additional Question: Only a small question, how about boundary condition? I mean for hydraulic diameter, should I assume whole diameter or applying 4*Area/Pwet for 30° slice?

October 16, 2014, 08:00
#25
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Daniele
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Quote:
 Originally Posted by mustafa-uslu This was Awesome!!! I just started to understand periodic boundary conditions and in my first shot I succeeded with help of this topic, Thank you very much Peter! Additional Question: Only a small question, how about boundary condition? I mean for hydraulic diameter, should I assume whole diameter or applying 4*Area/Pwet for 30° slice?
Whole diameter!

 October 16, 2014, 08:03 #26 New Member   Musty Join Date: Oct 2013 Posts: 8 Rep Power: 5 Cheers, thats what I've done though

October 16, 2014, 08:42
#27
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Musty
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 Originally Posted by euanw6 I am using a 20 degree segement of a annular cascade of 18 stators. I have followed the steps noted to apply periodic BCs to each side of the 20 degree segment but I get the following error. zone 11: matched 0 out of 4395 faces. zone 10: matched 0 out of 4395 faces. Error: Failed to make zones periodic. Error Object: #f Seems like I may have missed something out but I've followed each step. I created named selections for these two faces and called them interface1 and interface2.
This is also happening to me when I do some changes on geometry/mesh. What I do is each time I double check the periodic faces (if they are still same and matched) and open fluent, having this error and apply same procedure over and over again (mesh/modify/make periodic).

I dont know if there is easier way (to cancel previous selections and apply always new)

 December 1, 2014, 02:15 problem in face matching in periodic boundary condition #28 New Member   MOHD ZEESHAN FARIDI Join Date: Nov 2014 Location: SILCHAR, ASSAM Posts: 1 Rep Power: 0 hi, peter and cfd fellows i hv encountered a problem in making periodic boundaries in fluent i.e translation deltas: 0.000000 0.000000 0.003630 zone 27: matched 259 out of 307 faces. zone 26: matched 259 out of 312 faces. Error: Failed to make zones periodic. Error Object: #f kidly give me somepath for this thanks hope 4 ur answer

 December 17, 2014, 06:31 #29 Member   shahid Join Date: Oct 2013 Posts: 88 Rep Power: 5 Dear Peter I have one very important question. How to define periodicity For Rotor and Stator in ICEM CFD when there are different Number of Blades for Rotor and Different Number of Blades for Stator, since the angle will be different for Each of Them. Thank You

 June 3, 2015, 20:15 #30 New Member   Islam H. Mohamed Join Date: Oct 2014 Posts: 3 Rep Power: 4 Hi Peter, how can i determine the proper principal axis and the orientation about the principal axis ?

 July 4, 2015, 10:17 Help required Regarding Periodic Boundary condition in Subchannel of Reactor #31 New Member   Monib ur Rehman Join Date: Jul 2015 Posts: 1 Rep Power: 0 Hi every one. I am working on CFD using Fluent. i have stuck in the middle. Could anyone please tell me how do i apply periodic boundary condition on walls of sub channel of nuclear reactor? When i apply, i get divergence errors.Please help Thanks in advance

February 3, 2016, 12:20
#32
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I think if you only have created a periodic/cyclic symmetry, it would be enough as mentioned in ANSYS meshing guide!

 February 17, 2016, 02:59 #33 New Member   Senthilkumar Join Date: Oct 2012 Posts: 14 Rep Power: 6 Hi all, For ICEM users this following link is helpful for doing periodic Boundary condition https://www.youtube.com/watch?v=HYJcXt0SdMA

 March 10, 2016, 08:06 #34 New Member   Jittanakatti Join Date: Nov 2015 Posts: 3 Rep Power: 2 In addition you can also get the periodicity in FLUENT by just making some setting in the Display menu Go to.... Display – Views – Periodic Repeats (define) – translation/rotational Achieve your desired periodic contours! Thank you, Jittanakatti

March 13, 2016, 14:27
#35
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John
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Quote:
 Originally Posted by michel2008 Actually, I think the only difference for a translational one is to define a coordinate system which I did and all the steps worked but this yellow light in the coordinate system prevent to apply right periodic region [/B]
If you choose Cylindrical coordinate system it should not be yellow, and would work, but it would create mesh as for Rotational Periodic (the same mesh would be obtained with the rotation). If you need Translational Periodic, try using Model -> Symmetry -> Symmetry Region with Linear Periodic type instead. The mesh would be copied by translation, not rotation, which suits for Translational Periodic B.C.

March 20, 2016, 12:20
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 Originally Posted by m5edr Hi Peter I read the above part carefully and discovered the reason that make FLUENT refused to complete the Periodic B.c of my problem. Yes , I have two separate Bodies (Domains) and it is not allowed to make one part (the reason: to make each Domain has it is interface face , if i made one part i will got only one interior face) But Fluent after make periodic B.C successfully ,it told me the periodic operation failed !! I'm upload My File here ( https://www.dropbox.com/s/4stnm7cm35...%20turbine.rar ) Could you help to solve this Thanks in advance
Dear expert.. I have to use Superficial gas velocity 0.0016 m/s. But In fluent we have to put Velocity Magnitude at VELOCITY INLET boundary conditions.( INLET VELOCITY) How can I calculate INLET GAS VELOCITY form superficial gas velocity??? ( Reactor dimensions are 20*5*50 cm W*D*L and inlet dimensions are 2.4*1.2 L*D )

March 20, 2016, 15:09
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John
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 Originally Posted by furqanrk Dear expert.. I have to use Superficial gas velocity 0.0016 m/s. But In fluent we have to put Velocity Magnitude at VELOCITY INLET boundary conditions.( INLET VELOCITY) How can I calculate INLET GAS VELOCITY form superficial gas velocity??? ( Reactor dimensions are 20*5*50 cm W*D*L and inlet dimensions are 2.4*1.2 L*D )
It is off topic, you ought to create new post the next time.

Superficial velocity is a velocity that gives the same mass flow rate at any reactor cross-section (or volumetric flow rate, we do not care about density is varying or not - superficial velocity is engineering value based on the mean values). Superficial velocity is just Q/A, i.e. volumetric flow rate / cross-section.
As you have circular cross-section for reactor and inlet, the area A is PI*D^2/4. Q is fixed (to hold continuity principle).
If you have superficial velocity = 0.0016 for reactor (r-r) cross-section, you have to convert it 0.0016*(PI * Dr-r^2 / 4)/(PI * Dinlet^2 / 4) = 0.0016*Dr-r^2/Dinlet^2. Both D values should be put in the same units!
If you have superficial velocity = 0.0016 for inlet, no conversion is needed.

March 21, 2016, 07:40
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Quote:
 Originally Posted by villager It is off topic, you ought to create new post the next time. Superficial velocity is a velocity that gives the same mass flow rate at any reactor cross-section (or volumetric flow rate, we do not care about density is varying or not - superficial velocity is engineering value based on the mean values). Superficial velocity is just Q/A, i.e. volumetric flow rate / cross-section. As you have circular cross-section for reactor and inlet, the area A is PI*D^2/4. Q is fixed (to hold continuity principle). If you have superficial velocity = 0.0016 for reactor (r-r) cross-section, you have to convert it 0.0016*(PI * Dr-r^2 / 4)/(PI * Dinlet^2 / 4) = 0.0016*Dr-r^2/Dinlet^2. Both D values should be put in the same units! If you have superficial velocity = 0.0016 for inlet, no conversion is needed.
Dear sir,
First of all sorry to start off topic.. I tried to create new post but unsuccessful. Because in china english website is not easy to open. . .
Second.. your answer is quite good. My problem is solved because of your guidance . thank you..

 July 3, 2016, 06:33 Periodic boundary condition #39 New Member   Nabeel Khaleel Join Date: Jun 2016 Posts: 4 Rep Power: 2 Hi everyone Is it possible to specify more than one periodic boundary condition in FLUENT?

 Tags fluent 13.0, how to, periodic boundary, tutorial

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