January 23, 2022 at 2:26 ambarteoSubscriber
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?
BaranJanuary 24, 2022 at 11:04 amKishan KonannavarAnsys EmployeeHello
Ansys staff are not permitted to download attachments from the forum, can you please insert the image directly into your post?
January 24, 2022 at 2:09 pmJanuary 28, 2022 at 2:03 pmKishan KonannavarAnsys EmployeeHello
Could you tell what dynamic mesh settings are you using?
January 28, 2022 at 3:09 pmbarteoSubscriberHello 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?
February 4, 2022 at 12:55 pmKishan KonannavarAnsys EmployeeHello" target="blank">ANSYS Fluent: Dynamic Mesh Problem for a Piston and Reed Valve - Part I - YouTube
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)
Isentropic Compression Simulation Example | Ansys Courses
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