CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Pre-Processing

Decomposing meshes

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

Like Tree14Likes

LinkBack Thread Tools Search this Thread Display Modes
Old   October 1, 2021, 10:51
New Member
Raj Viren Lakhani
Join Date: Oct 2021
Posts: 1
Rep Power: 0
Rajl is on a distinguished road
Originally Posted by GerhardHolzinger View Post
Let me share a recent observation of mine.

I simulated axi-symmetric gas flow in a long pipe. As the domain is quite large, the simulation was run using several parallel processes. The scotch decomposition created a processor boundary, which zic-zags through the pipe.

The part of the processor boundary, which is parallel to the flow, seems to create some disturbance in the pressure field. Luckily, the disturbance does not blow up the simulation, yet it's quite interesting.

The attached images show the pressure field. The involved subdomains are shown as white wireframes.

Hi.. Were yoou able to eliminate the zig zags in the parallel subdomains?
Rajl is offline   Reply With Quote

Old   December 19, 2022, 13:35
New Member
Join Date: Nov 2018
Posts: 17
Rep Power: 7
Nidalsb is on a distinguished road
Hello Tobi,

Have you found a solution to this? I have been struggling with this issue lately with 2 cyclic pairs in my simulation. Running in series gives me completely different results for Pressure in only the Z direction, the x and y directions are the completely unchanged though. very confusing. Tried different methods of decomposition and nothing seems to help
Nidalsb is offline   Reply With Quote

Old   February 24, 2023, 09:23
Default Problem In Mesh Decomposition
New Member
Peyman Haghighi
Join Date: Feb 2023
Posts: 1
Rep Power: 0
Peyman Haghighi is on a distinguished road
Dear Friends,
I want to decompose a mesh using DecomposePar command in OpenFOAM-7 along a single axis(for example z axis). However, I want the computational boundary cells of each part to be on a single plate(top and bottom plates' cells have a fixed z value)...If any one helps me in doing so, I will be more than happy...
The picture of the decomposed mesh applying simple algorithm is attached to this post...In this figure you can easily observe the problem I am dealing with...
Attached Images
File Type: jpg 1.jpg (109.2 KB, 3 views)
Peyman Haghighi is offline   Reply With Quote


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
Hex and Tet meshes - simplefoam comparison danvica OpenFOAM Running, Solving & CFD 10 January 4, 2013 01:18
Getting prism to inflate into mixed tet-hex meshes Joe CFX 16 October 10, 2011 07:06
HELP!! How could I obtain structured-orthogonal-body fitted meshes???? DajeMoo ANSYS 0 January 28, 2011 12:52
Dynamic Meshes Cfdtoy FLUENT 2 February 6, 2004 12:14
Large 3D tetrahedral meshes Aldo Bonfiglioli Main CFD Forum 4 August 27, 1999 03:33

All times are GMT -4. The time now is 04:20.