WIND User's Guide - Keyword Reference, HLLE

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HLLE - HLLE scheme anti-diffusion terms

HLLE EPSS epss [zone_selector]

This keyword allows the user to control the behavior of the anti-diffusion term in the HLLE scheme. 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 1.0 Anti-diffusion terms are always fully on. This is the default.

> 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 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 mimimum value of 0.0 (fully off), which corresponds to epss = -1.0.

See Also: RHS

epss	switch	Result
0	1.0	Anti-diffusion terms are always fully on. This is the default.

> 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	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 mimimum value of 0.0 (fully off), which corresponds to epss = -1.0.