regarding periodic boundary condition
 

Hi
I want to give Periodic boundary condition on blades but it is giving error as below...
/grid> modify-zones

/grid/modify-zones> make-periodic
Periodic zone [()] periodic_1
Shadow zone [()] periodic_2
Rotational periodic? (if no, translational) [yes]
Create periodic zones? [yes]

zone 12: matched 0 out of 676 faces.
zone 13: matched 0 out of 676 faces.

Error: Failed to make zones periodic.
Error Object: #f

/grid/modify-zones>
What is the reason and how it can be corrected...

Thanks in advance:)

Re
 

I'm face the same problem
any help pls,

Hello
For periodic boundary conditions give the boundary conditions in gambit itself and then when you will export to fluent it be a periodic boundary condition

second define it with any name and boundary types in gambit and then in fluent go to the boundary condition and change the boundary type to periodic

thanks
hope that will help you

Re
 

Many thanks for replay BUT the problem is:
I'm using Ansys Workbench, so I'm used Ansys Mesher Not Gambit in my meshing my geometry
Do you know who to solve this with Ansys?
thanks again

yup i know
give any boundary condition name there is ansys mesher
and then go to fluent in bounday condition change it to symmetry

that's it

You mean, I change the b.c to symmetry
THEN make it periodic by write the following command in fluent window:mesh -> modify-zones -> make-periodic

no
go to boundary conditions
there change the boundary condition of those ares to symmetry.

Sorry , i can't understand
I have 1/3 cylinder, the sided faces should be periodic.
Is Symmetry equivalent to Periodic type!!!

send me the files i will try to tell you how to do

Thanks
Mail pls
(the files are 11 MB)

send me geo with meshing in zip form in ansys 13 or 14 format

No symmetry is not equivalent to periodic. In figure you said the wall should be interior, rather it should be interface: one for internal fluid and one for external fluid.

Re
 

Dear/Far
No it was an an old problem, i solved it
sorry
Now, i have to define the "periodic type zone" to the two faces as appear in this pic

I'm made Match Face control in Ansys Mesher , Then i opened the fluent
and write the following (mesh -> modify-zones -> make-periodic)
After that fluent appear the first massage in this discussion !!

you can try this solution and accuracy is as good as pure periodic planes. you can write them as interface and then go to interface panel and then define them as interface with periodic condition.

I shall look into this issue, as I used to get this message in starting of my career.

Thanks ,Far
But interface solution cause dispersion to me ( i tried it before)
if you find solution, tell me pls
thanks again

I used it many times and it is as good as periodic boundary. Send files through file sharing

Re
 

Thanks but
Case File is 9 Mb
can't be attached

use 4shared http://www.4shared.com/

http://www.4shared.com/file/Xf_fq-6s/FFF.html
Many thanks Far

Hi m5edr,

Did you solve the problem? I have the same problem and I don't know what causes or what can I do :confused:

Thanks in advance!

Regards

Pls explain which part you need
thanks

Hi!

I have done a mesh with the match control option, and it works well, but when I try to make the zones periodic in Fluent it gives me the same message of your first post.

Regards

EDIT: Sorry, the message is the one that appears in the first post of discussion, not in your post. Thanks in advance!

this may help you
http://www.cfd-online.com/Forums/flu...oundaries.html
regrads

Hi,

I have remeshed the geometry and I don't have the problem right now, but I will try this solution when the message appears again.

Thank you very much!

Regards

Normally there could two reason for this error. First check the origin of rotation.
So how do we check, open the design in design modeler then use point entity to check the centre of rotation coordinate. u can even draw on the surface of your model and find the centre of rotation. (anyway works). if its rotating along z axis then get the x and y coordinate and place it in fleunt>cell zone condition> rotation axis origin.

if it does work then maybe its due to different number of cell on the face of the two surface. It a non conformal periodic.(https://www.sharcnet.ca/Software/Flu...ug/node186.htm) you have change the type of B.c from wall to interface then use Mesh Interface where you select the surfaces, check the periodic B.C set the angel offset and create periodic.

I couldn't do this step .... could you explain this step in details
thanks in advance