Fluxes...
The most crucial and computationally expensive task is to find an appropriate discrete representation for the flux components. To avoid unnecessary complications we look closely at just one term of the sum in (3.1-2), at the partial flux of quantity which is related to (or driven by) quantity . The transformation of the equations from physical space to computational space is linear and, therefore, we can merely consider the term
For numerical reasons we distinguish between the cases where we have
- only a diffusive flux,
- only a convective flux,
- diffusive and convective flux.
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