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-   -   How to define periodic boundary conditions at Flu (http://www.cfd-online.com/Forums/fluent/27791-how-define-periodic-boundary-conditions-flu.html)

Wang July 21, 2000 08:58

How to define periodic boundary conditions at Flu
 
Hi, I have a problem when I use FLUENT5.3. I want to change two symmetry boundary conditions to a couple periodic boundary condition. However, I can not find this MENU in Flunet5. Could you tell me how to change them? Has FLUENT5 this function?

Pierluigi Allegro July 21, 2000 18:37

Re: How to define periodic boundary conditions at
 
You mast use the command line with these istructions:
:define
:bc
:modify-zone
:make-periodic

then answer the questions. By.

Wang July 24, 2000 05:40

Re: How to define periodic boundary conditions at
 
Could you tell me some details?

Harry August 25, 2000 22:07

Merge zone in FLUENT
 
1. i've a problem using fluent 5.1. i want to model 1 full mixing tank, but because it's difficult to mesh full tank, i draw 1/4 tank and then copy and rotate it in TGRID, and merge the zone i want. everything is ok in TGRID, but after i imported to fluent, fluent separate the zone. then i try use TFILTER. it's fine, but after i imported that mesh file to fluent again and using merge zone, theres a message unable to merge thread. zone X and Y doesn't match. What wrong with that????(i think i can merge any zone without restrictions).

2. can u tell me, how to add a new boundary cond type of Discrete Phase Modelling (escape,trap,reflect). i want to make myself.

Harry August 29, 2000 21:36

Re: How to define periodic boundary conditions at
 
maybe i can tell you the other way. you can back to your gambit. if you've mesh your volume, remove mesh first and then click link mesh, on mesh surface. click surface to be linked and point of linking. then gambit will draw a vector on the edge of your surface. then click adjacent surface (shadow surface), click the point of the 2nd surface, and then a point. if direction of the vector isn't same, click reverse. then you can mesh your volume. (see Fluent volume 1 on periodic boundary condition f or detail)


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