CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Remeshing issue due to solid contact

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 17, 2015, 11:46
Post Remeshing issue due to solid contact
  #1
New Member
 
Join Date: Jul 2014
Posts: 6
Rep Power: 11
Jrmy is on a distinguished road
Hello everybody,


I am trying to simulate the oscillation of a plate in a casing. The movement of the oscillating plate is driven by a UDF. And I want to have no leakage between each side of the plate. In order to do so, I am trying to remesh correctly the region where there is a contact between my plate and my porous region – just near my casing.



But I am struggling with the remeshing due to the contact between my disk and my porous media. The mesh is moving, but no points, and then no new triangular cells are created on the “line” between my 2 zones (see picture 2 and 3 attached). As you can see the problem of the mesh is that no points are created on the “interface” between my porous mesh parts (on the left) and my fluid mesh part (right), leading to very bad quality mesh, and from a certain point, to a negative volume cell.

So I would like to know if someone can advise me about this problem, how to deal with the “line” to have a good remeshing?



My technical remeshing set up is:

-Smoothing with Spring/Laplace method:
Spring Constant factor: 0.5, Convergence Tolerance: 0.0001, Number of iterations: 150.
Moreover, Elements are Tri in Tri Zones (mesh only tri) and the Laplace Node Relaxation is set to 1.

-Remeshing:
I use Local Cell with Local Face and Region Face remeshing, I used typically a length scale min and max respectively bigger and smaller than the default one, to have a good remeshing. Maximum cell Skewness and Face skewness are set to 0.7, and the size remeshing interval is set to 1.


My Dynamic Mesh zones are:
- My plate, which is a rigid body driven by a UDF.
- My Porous parts which is deforming (to allow the mesh to deform) – Smoothing & Remeshing – Region and Local.



Thank you in advance.


Regards


Jeremy
Attached Images
File Type: jpg InitialPosition.jpg (30.3 KB, 42 views)
File Type: jpg maximumPosition.jpg (31.7 KB, 33 views)
File Type: jpg MiddlePosition.jpg (31.9 KB, 31 views)
Jrmy is offline   Reply With Quote

Old   July 27, 2015, 13:02
Default
  #2
New Member
 
Join Date: Jul 2014
Posts: 6
Rep Power: 11
Jrmy is on a distinguished road
Anybody for a small advice?

I just would like to know what kind of settings are required to allow the sweeping of my plate (or disc) along a wall?

Thank you in advance.

Jeremy
Jrmy is offline   Reply With Quote

Old   October 17, 2018, 06:18
Default
  #3
New Member
 
Join Date: Oct 2018
Location: Россия
Posts: 12
Rep Power: 7
Ingodwetrast is on a distinguished road
Quote:
Originally Posted by Jrmy View Post
Anybody for a small advice?

I just would like to know what kind of settings are required to allow the sweeping of my plate (or disc) along a wall?

Thank you in advance.

Jeremy
Honestly, I tell you, the program itself is bad, in principle. It is not clear how to change the settings. There are no examples from the developers of ansis. so I change random values.

You can change the maximum skewness from 0.7 to 0.65.
Play with the maximum and minimum scale lengths in the section "remeshing".
maximum scale length = 1.4 * nominal in mesh scale info or less than nominal (reference)
minimum scale length = 0.4 * nominal in mesh scale info or
more than nominal (reference)

Spring Constant factor: 0.9

Laplace node: 1

Number of iterations: 20...40

Last edited by Ingodwetrast; October 17, 2018 at 07:39.
Ingodwetrast is offline   Reply With Quote

Old   October 17, 2018, 07:53
Default
  #4
New Member
 
Join Date: Oct 2018
Location: Россия
Posts: 12
Rep Power: 7
Ingodwetrast is on a distinguished road
can be used to deforming by cylinder. over the plate zone layering. and then use sliding interface.
Ingodwetrast is offline   Reply With Quote

Old   October 18, 2018, 16:34
Default
  #5
New Member
 
Join Date: Oct 2018
Location: Россия
Posts: 12
Rep Power: 7
Ingodwetrast is on a distinguished road
Maximum Length Scale = 0.4 X Average length scale of fluid-ch.

Minimum Length Scale = 1.4 X Average length scale
Ingodwetrast is offline   Reply With Quote

Reply

Tags
remeshing, solid contact

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Dynamic contact angle calculation in multiphaseInterFoam rajeshchem OpenFOAM 3 December 23, 2022 14:00
Compiling issue regarding to Solid Particle injector's(solidParticle) implementation liguifan OpenFOAM Programming & Development 5 February 28, 2018 12:37
pimpleDyMFoam solid body rotation restart issue bennn OpenFOAM Running, Solving & CFD 0 November 28, 2013 17:16
[ANSYS Meshing] Solid to Solid Interface Issue cvetkovc ANSYS Meshing & Geometry 1 October 22, 2012 17:09
Multiple Solid Domains - Interfaces Scott CFX 8 July 31, 2008 15:20


All times are GMT -4. The time now is 22:40.