I want to define two rotational periodic boundaries (the angle between them is 180°). They are identically (equal number of faces, equal geometry).

/grid/modify-zones> make-periodic Periodic zone [()] 5 Shadow zone [()] 7 Rotational periodic? (if no, translational) [yes] yes Create periodic zones? [yes] yes

zone 5: matched 13596 out of 15234 faces. zone 7: matched 13596 out of 15234 faces.

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

Can someone help me ??

can u specify the details of the geometry, then we can discuss about the problem - thanks!

[m5edr]

I'm now face the same problem
could any one pls, tell me how to fix this problem

[dbarnett]

Has anyone determined a solution to this problem in Fluent? I also am working on simulations that require rotational periodicy. Occasionally I am able to create the periodic zones, but sometimes I receive the errors: "Error: Failed to make zones periodic. Error Object: #f"

I believe that I am not doing anything different when I create the periodic zone successfully. I am always ensuring that the rotational axis is aligned with the z-axis of the geometry and I am using match control in meshing for the two faces of the periodic zone. Any ideas of what may casue this?

[m5edr]

Originally Posted by dbarnett

Has anyone determined a solution to this problem in Fluent? I also am working on simulations that require rotational periodicy. Occasionally I am able to create the periodic zones, but sometimes I receive the errors: "Error: Failed to make zones periodic. Error Object: #f"

I believe that I am not doing anything different when I create the periodic zone successfully. I am always ensuring that the rotational axis is aligned with the z-axis of the geometry and I am using match control in meshing for the two faces of the periodic zone. Any ideas of what may casue this?

yes i solved it before,
Type in Fluent command Window
>Mesh
>mp if doesn't work try to type the following and change number
>Mesh
>Mz
>Mt "change value (limit is 0.5)"

[evswbok]

i faced the same problem. maybe u shoud make periodic in your meshing software ，then export the grid，at last import into FLUENT、、、、、、、which meshing software you are useing？？ICEM CFD can do it.

[Chavagnatze]

*I know I am late but, you must have the axis of rotation in the global z-direction for rotational periodicity. It may also be true that translational periodicity must be orthogonal across z as well.

Use /mesh/rotate in the interpreter and set your point of origin and axis of mesh rotation so that the global z-axis is parallel with the axis of periodicity

use /mesh/mz/make-periodic in the interpreter and move on as usual. You can also invoke periodicity in your meshing software (* Z-axis and axis of periodicity must be parallel) and Fluent should take care of it from there.

If there is a way to make the stored axis something other than (0 0 1) or any other vector, none of the above would matter.

[AbolfazlJalalabadi]

Originally Posted by Mary
;124397

I want to define two rotational periodic boundaries (the angle between them is 180°). They are identically (equal number of faces, equal geometry).

/grid/modify-zones> make-periodic Periodic zone [()] 5 Shadow zone [()] 7 Rotational periodic? (if no, translational) [yes] yes Create periodic zones? [yes] yes

zone 5: matched 13596 out of 15234 faces. zone 7: matched 13596 out of 15234 faces.

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

Can someone help me ??

Hi
The default tolerance can be problematic in small meshes

just use the text command
grid/modify-zone/mt
and specify smaller tol's untill all nodes are matched up and then you're good to go
I had to reduce from 0.1 to 1e-6