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falke126 March 12, 2012 17:29

AMI (GGI) to connect 2 parts
Hi to all,
I would like to use 2 stationary parts in a simulation, which are not 1:1 connected by the meshes...

In CFX I just use a ggi to connect them.

Now I would like to test this in OF. Has somebody done this in OF by the new AMI in OF210 and can give me a short advice?

Best regards,


linnemann March 13, 2012 03:05

Hi look at this tutorial


falke126 March 13, 2012 15:01

Thanks for your response,

ive had a look in these tutorials (propeller and the mixerVessel).

My problem is, that in these tutorials the AMI is used for cyclic sections and the interface is some kind of a cylinder barrel...

But I want to use it for a planar circular interface... e.g. to connect two pipe sections.

I hope the problem definition is clear...

I would be pleased, if someone can help me.

Best regards,

linnemann March 13, 2012 15:07


Its exactly the same approach.

You just couple two patches, dont matter if they are square/cylinder/disk/plane.

As long as they match sufficiently you're good to go

falke126 March 13, 2012 15:50


that sounds good :)

So I just define the 2 patches of type cyclicAMI?

Are there further steps to do, to get the case running?
At the moment Im not sure, what steps of the propeller tutorial
(e.g topoSet) are needed in my case.

Chris Lucas March 16, 2012 04:40


you could also have a look at the ggi tools in OpenFOAM-1.6 ext.

Best Regards,

falke126 March 20, 2012 10:04

In the last days I tried another approach - to connect the 2 pipe parts by the mergeMesh + stitchMesh utilities in OF.

Principally that works not so bad. But sometimes non-orthogonal faces are generated. ( *-warning in checkMesh (not ***))

Now Im thinking about, what is better?

- AMI (GGI) with the original good quality mesh
- direct connection with a slightly worser mesh quality

Best Regards,


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