[Gmsh] Ghost Cells

Christophe Geuzaine cgeuzaine at uliege.be
Fri Dec 8 21:09:46 CET 2017

> On 5 Dec 2017, at 21:37, Sudhi P V <SudhiPV at cmail.carleton.ca> wrote:
> Hi, 
> I am using 'gmsh' to mesh and partition a domain in to number of parts for easier and faster analysis. 
> During this process, I encountered with some -ve partition IDs in the MSH file. Upon referring to gmsh documentation, it was found to be named as Ghost Cells.
> I wanted to know the significance of these Ghost cells. Why are they called so ?

They allow to simplify the communication between adjacent partitions in some parallel codes.

The partitioner is in the process of being rewritten from scratch - and ghost cells will not be created by default anymore.


> and the use of representing them like this in any important calculations.
> I am attaching a msh file for your reference. I have meshed a simple square in four partitions.
> Regards,
> Sudhi
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Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 

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