Learning Forum

[barteo]

Hello,

I am trying to simulate a simple piston flow, pushing the fluid out from a nozzle at the end. See the attached image. The orange, blue, purple, and yellow colors represent the moving wall (20 mm), axis (118 mm), cylinder wall (100 mm), an orifice at the end (8 mm), respectively.

I am using a laminar, axisymmetric model with VoF (air and liquid) where the liquid is a non-Newtonian fluid with known rheological parameters.

The problem I am facing is that I cannot make the wall move.

I am using a profile file (.prof) that had the following text:

((x_motion 2 point)

(time 0 10)

(v_x 0.001 0.001))

This file is defined for the moving wall (rigid body), as well as the cylinder wall (deformation)

Can you please help? What am I doing wrong? What are your recommendations?

Thanks,

Baran

Screen Shot 2022-01-22 at 9.15.48 PM.png

[Kishan Konannavar]

Hello
Ansys staff are not permitted to download attachments from the forum, can you please insert the image directly into your post?
Regards
Kishan

[barteo]

Hi Kishan, please see below
Thanks!

[Kishan Konannavar]

Hello
Could you tell what dynamic mesh settings are you using?

Regards
Kishan

[barteo]

Hello I have the Smoothing (Diffusion) setting on, and the rest is described in my previous message above.
I do not have any other setting on.
Please advise. What settings would you recommend to move the piston (moving) wall?

[Kishan Konannavar]

Hello
Probably you would need to try layering setting. I would also suggest to check the profile text syntax. Check out the following links, maybe they could be helpful.
7.8.2. Profile File Formats (ansys.com)