Learning Forum

[smjang]

Hello
I have a question for you while educating customers with the Ansys Discovery example.
The material I referenced is an example of fluid analysis.

(In depth tutorial -> Fluid -> 2020 r2 part4 -> 1:58)
(Discovery In-Depth – Fluids)

An example training was conducted with reference to this video, but I couldn't confirm it before, but now I see that the fluid is flowing backwards in the direction of the outlet. The same reverse flow is occurring in the example video.

The trainees asked about this, but I didn't know how to respond.
Please explain this phenomenon.
Then, we will refer to it in the next training. 

[Subashni Ravichandran]

Hello smjang

Although, the particles seem to be moving backward that is not actually the case.

The particles in that region are actually reducing as the velocity in that region is starting to go out of range. (closer to zero).

For a better picture of the direction of flow I would recommend you use the vector result representation. 

[smjang]

Subashni So, can this part be improved in the next version to make it easier to check? In a way, it seems that we have no choice but to explain to the trainees that it is a bug on the display.

[Subashni Ravichandran]

Hello smjang

It is most definitely not a bug.

In some fluid cases, there may a back flow as well near the outlets due to pressure differences in the fluid region. 

Extending the fluid volume near the outlet in such cases can help avoid back flow.

[smjang]

Subashni Thank you for answer. We will refer to it in the next training. thank you.