Highly resolved numerical model

The advantage of LS and D1 techniques over the VOF method is that their indicator functions are smooth, rather than discontinuous, and are easier to solve. Another advantage of the LS and D1 methods over the MAC method is that these two techniques do not suffer from the lack of divisibility that discrete particles exhibit. There are highly accurate numerical schemes that can be applied to the level set equation. The disadvantage of level set method, however, is that the level set needs to be reset periodically which is not strictly mass conservative. The DI method models interfacial forces as continuum forces by smoothing interface discontinuities and forces over thin but numerically resolvable layers. This... 

As can be seen from the above, the shape of the resolved rotational structure is well described when the parameters of the fitting law were chosen from the best fit to experiment. The values of estimated from the rotational width of the collapsed Q-branch qZE. Therefore the models giving the same high-density limits. One may hope to discriminate between them only in the intermediate range of densities where the spectrum is unresolved but has not yet collapsed. The spectral shape in this range may be calculated only numerically from Eq. (4.86) with impact operator Tj, linear in n. Of course, it implies that binary theory is still valid and that vibrational dephasing is not yet... 

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