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12.7 Convective Field

(syntax)

$\begin{figure}\centering \begin{tabbing} \texttt{'MATERI'} \\ [-1.0ex] \rule{14... ...\>\texttt{UPWIND}\>\texttt{\textit{tau}}$_{r}\,${]} \end{tabbing} \end{figure}$

DIFFUS: alpha is the general diffusivity $\alpha$ .
CONVEL: specifies the convective velocity field. The values vcx, vcy and vcz are the components of the convective velocity in the global XYZ directions: v_c.X , v_c.Y and v_c.Z . The value vcz is only required for three-dimensional models.
UPWIND: tau specifies an additional diffusion $\tau$ in the streamline direction (upwind). Input of upwind is optional, by default DIANA calculates a streamline upwind value for each element, depending on its size and the values for diffusivity and convection.

DIANA-9.3 User's Manual - Material Library
First ed.

Copyright (c) 2008 by TNO DIANA BV.