Wind-US User's Guide - Keyword Reference, HLLE

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HLLE - Anti-diffusion terms for HLLE and Rusanov schemes

Structured Grids

{HLLE | RUSANOV} EPSS epss [zone_selector]

This keyword allows the user to control the behavior of the anti-diffusion term in the HLLE and Rusanov schemes for structured grids. The parameter epss is used in the computation of a switch used to regulate the anti-diffusion terms. The possible values for epss are shown below.

epss	switch	Result
0.0	1.0	Anti-diffusion terms are always fully on.

> 0.0	1.0 − epss \|p_scal\|	Anti-diffusion terms are on, scaled by the absolute value of a pressure gradient scaling parameter p_scal, with epss as a coefficient. The result is that the anti-diffusion terms are smaller in regions where the pressure gradient is changing rapidly. Larger values of epss result in smaller anti-diffusion terms. The switch is limited to a minimum value of 0.0 (fully off).

< 0.0	1.0 + epss	Anti-diffusion terms are on, with the switch hard-wired to the indicated value. Larger negative values of epss result in smaller anti-diffusion terms. The switch is limited to a minimum value of 0.0 (fully off), which corresponds to epss = −1.0.

The default value for epss is 0.0 for the HLLE scheme, and 0.5 for the Rusanov scheme.

See Also: RHS

Last updated 6 Oct 2003