On 09/23/2016 11:17 AM, dragniko...@gmail.com wrote:
Well, the actual situation is more complex, requires a generic solution,
but it simplifies into a calculation of total quantity through a
boundary. For instance, a simple case: say we have heat or mass transfer
problem (or any scalar quantity) and specified some boundary conditions
(problem-specific), how to get the total heat/mass passing through the
specified boundary? Theoretically, the equation is something like (c is
concentration here):
<https://lh3.googleusercontent.com/-MWUI0byfiww/V-Viw0UincI/AAAAAAAAAAo/Z_b79mL9Rv0kYw9TqBkbn3m_qcBnIKwNwCLcB/s1600/eq200.gif>
Honestly, I do not understand the theory in the tutorial 44 (it's
completely out of my area).
Here is a piece of code that does what you want, though with a bigger
set up to get at the solution gradients and coefficient values than you
probably need:
https://github.com/geodynamics/aspect/blob/master/source/postprocess/heat_flux_statistics.cc#L122
It loops over all faces and then over the quadrature points of each face.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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