What is Halo nodes in SU2?

davidsubo · October 23, 2018, 18:04

Hi. I start to learn SU2_PY. For FSI problems,in FSIinterface.py, there is line:

self.nLocalFluidInterfacePhysicalNodes = self.nLocalFluidInterfaceNodes - self.nLocalFluidInterfaceHaloNode

I am confused what is HaloNode of fluid mesh? is it connected with dual mesh?

Does anybody know this and is there figure show this? I am looking forward to your response.

Thank you very much!

pcg · October 24, 2018, 10:02

Halo nodes are created during partitioning of the domain for parallelization.
Each MPI rank (i.e. processor) gets a part of the original domain. These smaller parts overlap slightly, some nodes appear in two partitions, one "owns" the node the other does not, for the latter that node is a halo node.

davidsubo · October 24, 2018, 23:02

Thank you! Yes,it is for information transfer between the the partitions for parallelization.

October 23, 2018, 18:04	What is Halo nodes in SU2?	#1
davidsubo New Member bosu Join Date: Aug 2018 Posts: 2 Rep Power: 0	Hi. I start to learn SU2_PY. For FSI problems,in FSIinterface.py, there is line: self.nLocalFluidInterfacePhysicalNodes = self.nLocalFluidInterfaceNodes - self.nLocalFluidInterfaceHaloNode I am confused what is HaloNode of fluid mesh? is it connected with dual mesh? Does anybody know this and is there figure show this? I am looking forward to your response. Thank you very much! Last edited by davidsubo; October 23, 2018 at 22:09.

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October 24, 2018, 10:02		#2
pcg Senior Member Pedro Gomes Join Date: Dec 2017 Posts: 465 Rep Power: 13	Halo nodes are created during partitioning of the domain for parallelization. Each MPI rank (i.e. processor) gets a part of the original domain. These smaller parts overlap slightly, some nodes appear in two partitions, one "owns" the node the other does not, for the latter that node is a halo node.

October 24, 2018, 23:02		#3
davidsubo New Member bosu Join Date: Aug 2018 Posts: 2 Rep Power: 0	Thank you! Yes,it is for information transfer between the the partitions for parallelization.