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

[ANSYS Meshing] Meshing issues on a very thin bag

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 24, 2021, 01:47
Default Meshing issues on a very thin bag
  #1
New Member
 
Join Date: May 2021
Posts: 1
Rep Power: 0
meck is on a distinguished road
Hi everyone,

I am fairly new to this forum, and this is my first post, so please forgive any rookie mistakes I may make .

I am trying to run a fluent simulation of a liquid inside a thin plastic bag, exactly like the blood bags you would find in a hospital. The thickness of the bag wall is 0.0127cm (5 mil), and for the sake of the simulation the bag is approximated as an elliptical cylinder.

The thickness of the plastic bag walls in uniform throughout, and the top and bottom of the elliptical cylinder are flat.

When trying to mesh my geometry, the bag fails to mesh due to it being so thin. The error I am receiving states: "Patch-conforming tetrahedron mesh failed because of an edge intersection in the boundary mesh."
I have read through some ANSYS documentation on meshing and tried other techniques such as sweeping mesh, multizone, layered tetrahedron, and creating a midplane within the wall of the bag and meshing that surface; but had no luck.

I can create the mesh by making the element size very small, but this creates over 200k elements and I am unable to run that with my license.

I think it is important to note that I only have a student license of ANSYS and do not have access to ICEM.

I am stuck trying to figure out how to mesh the thin plastic bag, so if anyone can assist or provide some other resources I can read up on it would be greatly appreciated.


Thanks in advance!
meck is offline   Reply With Quote

Old   June 8, 2021, 10:35
Default
  #2
Senior Member
 
Join Date: Mar 2009
Location: Norway
Posts: 137
Rep Power: 17
kjetil is on a distinguished road
For such a geometry I would advice to sweep the mesh from the end surface, when using Ansys Meshing (not Fluent meshing). Then make sure to select the end/start surface as your "source", as the program might not auto detect this properly.
kjetil is offline   Reply With Quote

Reply

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
[ANSYS Meshing] Problems meshing thin region ... fanta ANSYS Meshing & Geometry 0 March 6, 2021 11:38
Meshing thin and extremely long insulated pipe Y27 STAR-CCM+ 2 September 17, 2020 08:16
Issues with turbogrid meshing and mikandri CFX 7 September 13, 2020 16:10
Help needed for volume meshing issues sidharth9426 ANSA 3 March 6, 2016 13:40
thin extrusion meshing guillaume Siemens 3 November 4, 2008 09:53


All times are GMT -4. The time now is 01:00.