[ghost82]

Hi!
I'm having a problem with the latest version of ensight..I feel like a stupid but I cannot solve this problem..
I have a rotor-stator fluent simulation and I want to display in plane vectors between the rotor and the stator..it seems quite simple..
I have the planar surface, which is called interface (created in pre-processing), so I exported from fluent to ensight gold the velocity magnitude variable (I want to color vectors by velocity magnitude), selected the interface plane and click on the vector button (in advanced options I selected also tangential).
The problem is that vectors don't appear. I noticed that if I drag and drop the velocity variable (sub-group of vectors) on the interface surface, it is colored all in blu (0 m/s velocity).
The range in the vector group panel is ok (0-46 m/s).
Fluent displays correctly in plane vectors.

Any advice?

Thank you

[kevincolburn]

Daniele,

On the face of it, I think that you are following the correct procedure to create vector arrow display.

First thing to check is to make sure that Fluent actually exported velocity variables for that part. For interface parts, Fluent may not be correctly exporting vector variables for those parts.

The first thing I would do is to create a clip plane at the same location through the model (ie clip through the fluid domain). Now, display vector arrows on that clip part. If they do, then we can further investigate/verify that Fluent did not export out the vector variables for the interface parts. (It is normally pretty good export). I can help you here if that is the case.

If the clip plane also fails to show vectors (or color look wrong), then we can dig further into what the problem is.

For future reference, you don't have to export the velocity magnitude scalar specifically. In EnSight, when you color by a vector, the default option is that the color will be the magnitude of the vector. Alternatively within EnSight, you can easily specify that the color should be the X, Y, Z components (or derive your own based on surface normal or other).

-Kevin

[ghost82]

Hi Kevin
Thank you for your reply!
Vectors are displayed correctly by creating the clip plane.
I suspect a bug in fluent when exporting: when an interface is created in fluent you need to specify what type it is, and my interface is defined as wall ( for the non overlapping portion).
However since walls are defined as no slip I think fluent export the no slip condition for the whole interface (overlapping and non overlapping portions.

Daniele

[kevincolburn]

Daniele,

Yes, that sounds plausible. If the settings in Fluent are for a non-slip wall, it will attempt to write out those boundary constrained values for that part. Sounds like we know why they are zero values coming from fluent, and you can utilize the clip plane approach for internal inspection of the vector field.

-kevin

[ghost82]

Hi Kevin,
the strange thing is that if I export the velocity magnitude and I color the interface surface I get the right values (drag and drop from the scalar menu), but if I color the interface with the "velocity" (drag and drop from the vector menu) I get 0 values, so I don't know if it's a fluent bug in exporting the data or something else.
Maybe it can help.
Since the file is big I can arrange a sample case if needed.

[kevincolburn]

Sounds like the vectors are not defined for that part (while some of the scalars are). If you have an example dataset, I'd be glad to take a look at the problem and see if there is anything we can do to rectify the issue.

-Kevin