# [swak4Foam] groovy BC

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 October 25, 2013, 13:31 groovy BC #1 Senior Member     ahmed Join Date: Feb 2010 Posts: 182 Blog Entries: 1 Rep Power: 13 Hi foamers, i'm using groovy BC to express relation between pressure in two different patches. the problem is that expression takes average value of pressure in each patch and input it in my equation to output one value assigned to patch with groovy BC. while i want this equation to be applied for every cell not the patch as a whole and value for every cell to be evaluated from corresponding cells pressure in the two other patches (the three patches have same number of cells). is it possible with groovy BC.

October 28, 2013, 16:48
#2
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Bernhard Gschaider
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Quote:
 Originally Posted by Ahmed Khattab Hi foamers, i'm using groovy BC to express relation between pressure in two different patches. the problem is that expression takes average value of pressure in each patch and input it in my equation to output one value assigned to patch with groovy BC. while i want this equation to be applied for every cell not the patch as a whole and value for every cell to be evaluated from corresponding cells pressure in the two other patches (the three patches have same number of cells). is it possible with groovy BC.
First: on a patch you have faces not cells (that may seem minor but it makes reading the questions harder because on has to guess what you mean)

Second: what is the third patch

Something like this is possible if the two patches are "mapped" patches. Have a look at the examples there are two mapping-examples in Examples/test

For non-mapped-patches this is not supported and I have explained multiple times on the forum why not
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 November 5, 2013, 12:09 #3 Senior Member     ahmed Join Date: Feb 2010 Posts: 182 Blog Entries: 1 Rep Power: 13 Hi, i tried mapFields and i got this error message Code: ```--> FOAM FATAL IO ERROR: cannot find file file: /home/khattab/OpenFOAM/khattab-2.1.0/run/tutorials/heatTransfer/chtMultiRegionSimpleFoam/masterCase4/processor0/system/controlDict at line 0. From function regIOobject::readStream() in file db/regIOobject/regIOobjectRead.C at line 73. FOAM exiting``` i don't know what i must do? another thing. i want to take two fields only from source case (U,P) which not only fields in source case or target case. thanks in advance

November 7, 2013, 07:08
#4
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Bernhard Gschaider
Join Date: Mar 2009
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Quote:
 Originally Posted by Ahmed Khattab Hi, i tried mapFields and i got this error message Code: ```--> FOAM FATAL IO ERROR: cannot find file file: /home/khattab/OpenFOAM/khattab-2.1.0/run/tutorials/heatTransfer/chtMultiRegionSimpleFoam/masterCase4/processor0/system/controlDict at line 0. From function regIOobject::readStream() in file db/regIOobject/regIOobjectRead.C at line 73. FOAM exiting``` i don't know what i must do? another thing. i want to take two fields only from source case (U,P) which not only fields in source case or target case. thanks in advance
How is that related to the topic of this thread? Does it only happen if you use a groovyBC or is it a general problem with mapFields in parallel and multi-region cases (in that case I suggest you start a new thread)
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 November 7, 2013, 08:51 #5 Senior Member     ahmed Join Date: Feb 2010 Posts: 182 Blog Entries: 1 Rep Power: 13 Hi, thanks for your reply, i already started new one. http://www.cfd-online.com/Forums/ope...i-regions.html but this new thread is with another problem related to multiregions. for my problem with multiprocessor i didn't find solution but i used one processor to overcome it. thanks in advance.

 Tags cell, groovy