CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > ANSYS Meshing & Geometry

[ANSYS Meshing] Help with Ansys Meshing for fluent overset grid

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

LinkBack Thread Tools Search this Thread Display Modes
Old   September 7, 2019, 03:03
Unhappy Help with Ansys Meshing for fluent overset grid
New Member
S Ram Kumar
Join Date: Jan 2019
Location: India
Posts: 12
Rep Power: 7
ramkr is on a distinguished road
Hello all, I wish to carry out overset meshing analysis for a body moving through a cylindrical channel in 3D with a T junction as inlet (Length of Cylindrical channel>>Inlet junction pipe and T junction location is in beginning). Now the distance between the object and channel's walls are close to 1 cm only and in overset meshing there needs to be at least 4 cells between two solid walls in the geometry. If we follow it, since this method comprises of channel and object meshes separately (with object mesh having a fluid boundary for the overset interface creation in the analysis).
Now my question is, I tried and succeeded in eliminating the overset errors of orphan cells, donor etc. by creating inflation layers with total thickness and number of layers. Although the residuals are converging, the mesh motion is not converging at each time step. I am pretty sure that this is owing to large aspect ratio of 45 (>15) in the background mesh of the channel. I want to improve the simulations by giving highly fine tetrahedral cells in the 1 cm gap region between the body and channel (both are concentric) instead of inflation layers. Only tetrahedral mesh works for this geometry and giving a very low maximum size in the order of the gap between the solid walls in ansys mesh sizing simply shoots up total count.
I saw a wonderful demonstration of overset meshing in the below video, whose screenshot I am attaching as image.
I wish to have a similar kind of grid in our circular channel, except that this sizing is not limited to a small portion of the total length, but must be thoroughly from the start to end of the pipe as object moves full length of pipe. And the highly fine sizing needs to be between the enclosure and the channel walls; not in the region of body. I could find very scarce resources for this issue. Your aid is very valuable.
Thank you
Attached Images
File Type: jpg Screenshot (111).jpg (144.8 KB, 73 views)
ramkr is offline   Reply With Quote


aspect ratio, inflation layers, overset mesh, tetrahedral mesh

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
Can you help me with a problem in ansys static structural solver? sourabh.porwal Structural Mechanics 0 March 27, 2016 18:07
Ansys SIG$ILL error loth ANSYS 3 December 24, 2015 06:31
2-way FSI in Ansys CFX 15 LucasGasparino CFX 3 August 6, 2015 04:17
Using ICEM CFD to repair/edit ANSYS Meshing Kaaji1359 ANSYS 2 July 30, 2013 11:28
Grid Independent Solution Chuck Leakeas Main CFD Forum 2 May 26, 2000 12:18

All times are GMT -4. The time now is 00:16.