x and y distance between cell centroids

ak6g08 · June 29, 2009, 14:26

hi,

I am looking to implement a finite volume equation directly via the connectivity macros available, and ive come across the 'ds' as the distance between centroids. I dont really want a generic distance between centroids however, I would like the dx and dy values...since I have an orthogonal grid, and want to calculate individual vectors.

is there a function which outputs the x distance between two centroids and faces, and the y distance between them as well (as its cycling across all the cells/faces)?...my grid is non-uniform. ideally i would like to represent cells in terms of a sort of north,south,east,west type coordinate system, but I cant see how to do that with a UDF. can someone please help..

Thanks
ak

gemini · June 30, 2009, 03:44

Hi,

Use C_CENTROID (UDF manual Section 3.2.2) and F_CENTROID (UDF manual Section 3.2.3) to obtain the coordinates of cell center and face center. Then you can easily calculate any distance you wish...

best luck

Gemini

June 29, 2009, 14:26	x and y distance between cell centroids	#1
ak6g08 Member Akour Join Date: May 2009 Posts: 79 Rep Power: 17	hi, I am looking to implement a finite volume equation directly via the connectivity macros available, and ive come across the 'ds' as the distance between centroids. I dont really want a generic distance between centroids however, I would like the dx and dy values...since I have an orthogonal grid, and want to calculate individual vectors. is there a function which outputs the x distance between two centroids and faces, and the y distance between them as well (as its cycling across all the cells/faces)?...my grid is non-uniform. ideally i would like to represent cells in terms of a sort of north,south,east,west type coordinate system, but I cant see how to do that with a UDF. can someone please help.. Thanks ak

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June 30, 2009, 03:44		#2
gemini Member Join Date: Mar 2009 Location: Istanbul, Turkiye Posts: 47 Rep Power: 17	Hi, Use C_CENTROID (UDF manual Section 3.2.2) and F_CENTROID (UDF manual Section 3.2.3) to obtain the coordinates of cell center and face center. Then you can easily calculate any distance you wish... best luck Gemini