access the information of the neighbour cell across a processor boundary?

sophie_l · June 1, 2015, 08:18

Dear Bruno,

Is it possible to access the information of the neighbour cell across a processor boundary? I know how to do that if both owner and neighbour cell are on the same processor, however, I cannot do that if otherwise. I'm sure OpenFOAM swaps data on the processor boundary using syncTools and the like, but I don't know how to employ those functions in my own solver. What I want to realise is to know the value of alpha1 of the neighoubur cell across a processor boundary while I have the information of the face shared by its owner cell and neighbour cell, and I know the owner cell on the current processor. Therefore, I need to know the cell number of the neighbour cell on another processor. I am not sure if I can do that on the solver level of code. Could you share some hints on this please? Thanks for your time in advance.

best Wishes,
Sophie

wyldckat · June 12, 2015, 19:57

Greetings Sophie,

I've moved your post from the thread where you originally posted http://www.cfd-online.com/Forums/ope...-problems.html - since it was a bit out of context... i.e., this is a programming question.

After a very brief Google search:

Code:

site:www.cfd-online.com openfoam access neighbour across processor

I got these:

Beyond this, I never needed this myself, so I have no idea how it can be implemented

Best regards,
Bruno

sophie_l · June 15, 2015, 17:53

Hello Bruno,

Thank you very much for your time indeed. That's very helpful to me.

thanks,
Sophie

kaifu · April 5, 2016, 04:20

Hi Sophie

Have you found the solution yet？ I am also interested.

//Kai

IColin · August 9, 2016, 15:05

Hi, Sophie

I am also very interested in how the neighbor cell information is accessed during the parallel for cells with inter-processor interface. Have you found the solution?

Colin

June 1, 2015, 08:18	access the information of the neighbour cell across a processor boundary?	#1
sophie_l Member Join Date: Nov 2012 Location: Liverpool, UK Posts: 51 Rep Power: 14	Dear Bruno, Is it possible to access the information of the neighbour cell across a processor boundary? I know how to do that if both owner and neighbour cell are on the same processor, however, I cannot do that if otherwise. I'm sure OpenFOAM swaps data on the processor boundary using syncTools and the like, but I don't know how to employ those functions in my own solver. What I want to realise is to know the value of alpha1 of the neighoubur cell across a processor boundary while I have the information of the face shared by its owner cell and neighbour cell, and I know the owner cell on the current processor. Therefore, I need to know the cell number of the neighbour cell on another processor. I am not sure if I can do that on the solver level of code. Could you share some hints on this please? Thanks for your time in advance. best Wishes, Sophie

June 12, 2015, 19:57		#2
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,982 Blog Entries: 45 Rep Power: 128	Greetings Sophie, I've moved your post from the thread where you originally posted http://www.cfd-online.com/Forums/ope...-problems.html - since it was a bit out of context... i.e., this is a programming question. After a very brief Google search: Code: site:www.cfd-online.com openfoam access neighbour across processor I got these: http://www.cfd-online.com/Forums/ope...tml#post303172 - post #3 http://www.cfd-online.com/Forums/ope...ber-patch.html Beyond this, I never needed this myself, so I have no idea how it can be implemented Best regards, Bruno __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

April 5, 2016, 04:20		#4
kaifu Member Kai Join Date: May 2010 Location: Shanghai Posts: 61 Blog Entries: 1 Rep Power: 16	Hi Sophie Have you found the solution yet？ I am also interested. //Kai __________________ Kai

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June 15, 2015, 17:53		#3
sophie_l Member Join Date: Nov 2012 Location: Liverpool, UK Posts: 51 Rep Power: 14	Hello Bruno, Thank you very much for your time indeed. That's very helpful to me. thanks, Sophie

August 9, 2016, 15:05		#5
IColin New Member Join Date: Jan 2014 Posts: 7 Rep Power: 12	Hi, Sophie I am also very interested in how the neighbor cell information is accessed during the parallel for cells with inter-processor interface. Have you found the solution? Colin