# Cell Mass flux

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 May 4, 2000, 16:32 Cell Mass flux #1 Sandeep Abhyankar Guest   Posts: n/a In a 2d problem with quad cells, I want to be able to calculate what is the mass flux of fluid flowing across a particular edge of the 2d cell. Is there a way to get this value by UDF's or by anything ?

 May 5, 2000, 04:11 Re: Cell Mass flux #2 Alfonso Ferrandez Guest   Posts: n/a Hi Sandeep, the following UDF allows you to calculate the flux across any thread in a 2D domain. If you want to calculate it for a single edge of a 2D Cell, I would recommend creating it as an independent 1D INTERIOR boundary condition. Then you can apply the algorithm below. Perhaps a check for the nodal coordinates of the given cell would also allow for a modification of the function below (Jonas! Another one for the repository! /************************************************** ****************/ /* This function calculates the flux across the given boundary. */ /* We make use of Fluent Macros for this. */ /* Note that the THREAD_ID parameter is the integer value shown as ID by the Boundary Conditions... Menu. */ /* Also, you must have defined domain as a global variable: */ /* extern Domain *domain; */ /************************************************** ****************/ real flow_rate(int thread_id) { real flowrate = 0.0; face_t face; Thread *face_thread; face_thread = Lookup_Thread(domain,thread_id); begin_f_loop(face, face_thread) { flowrate = flowrate + F_FLUX(face, face_thread); } end_f_loop(face, face_thread) return flowrate; } Hope it helps! AL

 May 5, 2000, 08:51 Re: Cell Mass flux #3 Jonas Larsson Guest   Posts: n/a I've added this UDF to the temporary UDF library at: ftp://ftp.cfd-online.com/fluent/ I named the file "flux_calculation.c" As before anyone can contribute other UDF's by uploading them to: ftp://ftp.cfd-online.com/incoming/

 May 5, 2000, 08:56 Re: Cell Mass flux #4 Sandeep Abhyankar Guest   Posts: n/a Thanks a lot AL.

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