How to use linked mesh generator

Dattu B. Pawar

I am facing below error during meshing ; The PERIODICITY Periodicity Number X axis can not be taken into account Faces of the constraints without reference face: 551, 562 To obtain the same face mesh on faces, you may use the LINKED mesh generator Please suggest how to proceed

Mohammed Elamin_22169

Hi Dattu, 

First you need to create a transformation corresponding to the periodicity planes (Geometry>>Transformation>> new). for example if I have quarter of the geometry starting from X axis, I would define the transformation like below.

Then you need to define a linked mesh generator using this transformation and assign this mesh generator to the corresponding faces on the periodicity plan (select faces then right click >> assign mesh generator to faces)  

 

I hope this helps, 

 

Dattu B. Pawar

Thanks Elamin for your prompt response.

Could you please clarify below things here

1.While creating transformation you have selected coordinate system, That which one should be selected,

2. Then While assigning linked mesh generator should we select that particular faces which are mentioned in error or should we all faces should be selected?

3. I am not clear, usually why this error gets generated

Mohammed Elamin_22169

Hi Dattu, 

I will start by your last question. Whenever you are using a periodicity in Flux you need yo make sure that the two periodicity lines (in 2D) or symmetry plane (in 3D) is having exactly the same mesh. This way the software can link the state variable correctly and ensure the right boundary condition and hence you get the message to use the link mesh.

Based on the above, you should apply this condition for all the faces in one periodicity lines or planes to link with the other. Typically if you are using an infinite box, its faces will be linked be defaults when you complete it. 

The coordinate system will be the reference for the points and angles (or distance) defined in the transformation. The one you select depends on your model, the idea is to define the right transformation (with correct reference coordinate system) to link the two periodicity lines or planes.

Thanks,       

Dattu B. Pawar

Mohammed Elamin_22169 said:

Hi Dattu, 

I will start by your last question. Whenever you are using a periodicity in Flux you need yo make sure that the two periodicity lines (in 2D) or symmetry plane (in 3D) is having exactly the same mesh. This way the software can link the state variable correctly and ensure the right boundary condition and hence you get the message to use the link mesh.

Based on the above, you should apply this condition for all the faces in one periodicity lines or planes to link with the other. Typically if you are using an infinite box, its faces will be linked be defaults when you complete it. 

The coordinate system will be the reference for the points and angles (or distance) defined in the transformation. The one you select depends on your model, the idea is to define the right transformation (with correct reference coordinate system) to link the two periodicity lines or planes.

Thanks,       

Thanks for the details Elamin,

I tried with the suggested process of creating Periodicity planes, & then mesh generator, however it's reflecting same error please suggest further,

 

error I am putting below-- as well model image is attached for reference

 The PERIODICITY PeriodicityNumberXaxis can not be taken into account
Faces of the constraints without reference face:
551 562
To obtain the same face mesh on faces, you may
use the LINKED mesh generator