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March 10, 2015, 13:08 |
cyclicACMI boundary condition treatment
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#1 |
New Member
Jim
Join Date: Feb 2014
Location: UK
Posts: 22
Rep Power: 12 |
Hi All,
I was wondering if anyone could enlighten me on how the cyclicACMI boundary condition introduced in OpenFOAM 2.3.x works, more specifically: -How are two boundary conditions handled on the same cell face? e.g. when there is partial overlap of a cell face (with say a wall BC) with another mesh region where fluxes are being interpolated to/from? The reason I am interested in this is I am trying to use this BC for a compressible flow model with rhoPimpleDyMFoam. I am consistently getting oscillating pressure fluctuations at the region connecting the two non-conforming meshes, maybe suggesting some sort of conservation problem ... Any comments would be much appreciated, Thanks |
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April 24, 2015, 16:15 |
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#2 | |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,980
Blog Entries: 45
Rep Power: 128 |
Greetings James,
I know I wrote about this the other day here on the forum... ah, found it: Quote:
What this effectively/probably results in is the situation where the ongoing fluid flow hits a wall when it wasn't expected, i.e. there is an unexpected backward step or forward step that occurs when the faces are only partially covered. Oh, and it should be using AMI interpolation for weighting the overlapped faces, hence using both wall and cyclicAMI for weighting the exchange between the two sides. Beyond this, I'll have a look into your other post on this topic, since it might be easier to diagnose the problem that way: http://www.cfd-online.com/Forums/ope...interface.html Best regards, Bruno |
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acmi, dynamic meshing |
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