Hi Georg,
there is no easier way to evaluate the gradients in the scv centers at
the moment.
If you have to do something like this, it usually hints to the fact that
your discretization isn't suited for the problem which you want to
solve. Like in Stokes, where we discretize both the pressure and the
velocities with vertex degrees of freedom. What are your primary
variables? Which other PDEs do you solve additionally?
Kind regards
Bernd
On 09/27/2016 10:16 AM, georg.fut...@dlr.de wrote:
Hello Dumuxers,
For my fuel cell model I would like to implement the following energy
balance in the membrane:
The last term on the right describes the effect of ohmic or joule
heating due to charge transport. Here, a dot product of the current
density has to be calculated resulting in a volumetric heat source.
Now here comes my question:
For the box method, the fluxes (current densities) are only defined at
the sub-control volume faces. Is there a way to calculate/interpolate
a flux representative for a sub-control volume (e.g. the flux at the
center of the scv)? Until now, I only found the possibility to
calculate the gradients at the scv center by setting the
EvalGradientsAtSCVCenter property to true and doing the same as in
computeSource of the freeflow/stokes/localresidual.hh. Then the flux
at the center of the scv can be calculated.
Is there an easier way?
Best regards
Georg Futter
——————————————————————————
*German Aerospace Center *(DLR)
Institute of Engineering Thermodynamics | Computational
Electrochemistry | Pfaffenwaldring 38-40 | 70569 Stuttgart
Dipl.-Ing. *Georg Futter* | Ph.D. student
Telefon 0711/6862-8135 | georg.fut...@dlr.de <mailto:georg.fut...@dlr.de>
www.DLR.de <http://www.dlr.de/>
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IWS, Universität Stuttgart fax: +49 711 685 60430
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