# Measurement at an arbitrary point in the domain on the fly

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 October 17, 2013, 09:15 Measurement at an arbitrary point in the domain on the fly #1 Member   Join Date: Aug 2012 Posts: 76 Rep Power: 7 Hi == 1 == Is there any member function of a class that we can extract, say, velocity magnitudes at an arbitrary point in the computational domain? For example at the coordinate ( 1.52 2.80 3.95 ), the function will interpolate the velocity magnitude from the neighbouring cells, so that we can use this value inside a modified solver on the fly. == 2 == Probes seem do not work for this particular case whilst they extract information from the nearest cell centre. == 3 == This would give a clue http://openfoamwiki.net/index.php/In..._%28by_cell%29; yet, I ponder whether I can use it for this case - and how? == 4 == I have found some other forum pages which consider the similar topic in a slightly different context, e.g. http://www.cfd-online.com/Forums/ope...ocity-fly.html, http://www.cfd-online.com/Forums/ope...ary-point.html , http://www.cfd-online.com/Forums/ope...n-runtime.html. Therefore, I somehow couldn't adapt the given answers to my case. I appreciate any help. Many thanks in advance.

 October 17, 2013, 12:06 #2 Member   Join Date: Aug 2012 Posts: 76 Rep Power: 7 == 1 == The solution seems to be now: Code: ```#include "interpolationCellPoint.H" //... const vector arbitrary_point ( 1.52 2.80 3.95 ); interpolationCellPoint velocity_at_arbitrary_point(U); velocity_at_arbitrary_point.interpolate(arbitrary_point, cellI);``` == 2 == Doxygen states: Code: `interpolate (const vector &position, const label cellI, const label faceI=-1) const` So, I guess we can store a list of celll; then, no need to scan the domain at each time step. == 3 == More info, and thanks to Bruno, I assume: http://openfoamwiki.net/index.php/In..._%28by_cell%29

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