Subgrid flux model for scalars

Currently, for Large Eddy Simulations, subgrid flux of scalars are obtained using a constant subgrid Prandtl number (default value is 1). It would be interesting to have more options as scalar fluctuations are not always similar to velocity fluctuations.

(transferred from Mantis bug tracker issue 215, opened by Mathtrack).

The issue concerns scalar subgrid fluxes in Large Eddy Simulations, but it names no source files, tests, or entry points. First locate the existing constant subgrid-Prandtl implementation and related validation cases; done should mean additional scalar-flux options are supported and verified against appropriate simulation results.

索引モデルが issue の本文から書いたものです。