[OREO]

Hi! I have some trauble when i observe vorticity of an simulation of a turbine blade.

Something irregular happened at interface，shown in finger.

I choose the rotational interface and the mesh is matched.

I can not find where is wrong.

Thanks for your help.

[OREO]

Originally Posted by OREO

Hi! I have some trauble when i observe vorticity of an simulation of a turbine blade.

Something irregular happened at interface，shown in finger.

I choose the rotational interface and the mesh is matched.

I can not find where is wrong.

Thanks for your help.

How to update the image……
I clicked the icon but it didn‘t work.

[Gert-Jan]

Use "Go Advanced" in the bottom of your screen. There are more option to add a figure.

[ghorrocks]

See the FAQ for a detailed description of how to put an image on the forum: https://www.cfd-online.com/Wiki/Ansy...n_the_forum.3F

[Opaque]

It would be great if you could confirm/answer the following:

- you are looking at vorticity at an interface set with rotation periodicity, correct?

- when looking at the values in CFD-Post, are you looking at conservative values or hybrid values?

- the mesh is matched (conformal) between the two periodic surfaces, correct?

- did you set the discretization at the interface as: Automatic, 1:1 or GGI?

[OREO]

Originally Posted by Opaque

It would be great if you could confirm/answer the following:

- you are looking at vorticity at an interface set with rotation periodicity, correct?

- when looking at the values in CFD-Post, are you looking at conservative values or hybrid values?

- the mesh is matched (conformal) between the two periodic surfaces, correct?

- did you set the discretization at the interface as: Automatic, 1:1 or GGI?

-Yes, I am looking at vorticity at an interface set with rotation periodicity.
-I have tried both of conservative values and hybrid values.
- The mesh is matched (conformal) between the two periodic surfaces.
-I have tried Automatic and 1:1 ，but it didn‘t solve the strange phenomenon at interface.

[OREO]

Originally Posted by Opaque

It would be great if you could confirm/answer the following:

- you are looking at vorticity at an interface set with rotation periodicity, correct?

- when looking at the values in CFD-Post, are you looking at conservative values or hybrid values?

- the mesh is matched (conformal) between the two periodic surfaces, correct?

- did you set the discretization at the interface as: Automatic, 1:1 or GGI?

There is the picture I have mentioned before.
Thanks a lot!

[OREO]

Originally Posted by Gert-Jan

Use "Go Advanced" in the bottom of your screen. There are more option to add a figure.

Thank you! I got it!

[OREO]

Originally Posted by ghorrocks

See the FAQ for a detailed description of how to put an image on the forum: https://www.cfd-online.com/Wiki/Ansy...n_the_forum.3F

Thanks for your help! It works.

[Gert-Jan]

Well, nice picture uploaded.

I'm not an expert in this area. So you tell me what is strange, and what not? Are it the green things? Blue things? Red area's? White lines?

In other words, you have to be more specific before we can help. We cannot read your mind.

[OREO]

Originally Posted by Gert-Jan

Well, nice picture uploaded.

I'm not an expert in this area. So you tell me what is strange, and what not? Are it the green things? Blue things? Red area's? White lines?

In other words, you have to be more specific before we can help. We cannot read your mind.

I am really appreciated for your note.
And There are some supplements.
The blue things and red things at interface which are not excepted emerge is strange.
I simulationed one passage, and choosed rotational Periodicity at the interface.
The variable shown on the pic equal to vorticity contour.

[Opaque]

From the picture, it seems to me you are not plotting the variable Vorticity directly, but some other variable (Cws) computed within CFD-Post, correct?

Could you please plot the variable Vorticity without any intermediate calculation within CFD-Post?

Those vortex core variables provided in CFD-Post are computed by CFD-Post, not the CFX-Solver and then it becomes difficult to isolate where the problem comes from.

Let us do one step at a time.

[OREO]

Originally Posted by Opaque

From the picture, it seems to me you are not plotting the variable Vorticity directly, but some other variable (Cws) computed within CFD-Post, correct?

Could you please plot the variable Vorticity without any intermediate calculation within CFD-Post?

Those vortex core variables provided in CFD-Post are computed by CFD-Post, not the CFX-Solver and then it becomes difficult to isolate where the problem comes from.

Let us do one step at a time.

Thanks for your response. What you said is really reasonable!
I check the "vorticity Z" of plane Hub computed by CFX-Solver. There is no strange phenomenon at interface，but the vortex core computed by CFD-post.

I also check the "vorticity Z" of the midspan , and I found some discontinuous values at interface . I am not sure whether they should be there or not.