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Old   October 7, 2015, 16:48
Default Limiter in gamma scheme
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Oliver Garbrecht
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Hi everyone,

I wrote a little post-processing tool to evaluate in which areas of my domain the upwind scheme is used for interpolation when using the gamma scheme.
The limiter / blending factor in the gamma scheme is calculated by

min(max(phict/k_, 0), 1);
For a phict larger than k_, the limiter is 1 and the scheme is 100% central differencing.
However, I don't understand what happens if phict is larger than +1. The scheme should then be 100% upwind, as stated in the gamma-paper by Prof. Jasak. However, the limiter still is 1 instead of 0. What am I missing here?

Many thanks in advance,
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gamma scheme, phict

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