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Brooks-Corey: fix some comments

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they were misleading or wrong.
This commit is contained in:
Andreas Lauser 2015-07-28 17:24:12 +02:00
parent bb100ced1c
commit 01aaaea95c
1 changed files with 7 additions and 23 deletions
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30
opm/material/fluidmatrixinteractions/RegularizedBrooksCorey.hpp
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@ -156,25 +156,15 @@ public:
} }
/*! /*!
* \brief A regularized Brooks-Corey capillary pressure-saturation * \brief A regularized Brooks-Corey capillary pressure-saturation curve.
* curve.
* *
* This is a regularized variant of the Brooks-Corey curve. For * This is a regularized variant of the Brooks-Corey curve:
* wetting phase saturations between a lower threshold saturation
* and \f$S_w=1\f$, for other wetting phase saturations it is
* regularized in a way which removes the singularity at
* \f$S_w=0\f$, avoids kinks and allows the capillary pressure to
* reach arbitrary values. (Albeit, to reach a given capillary
* pressure, the saturations can become unphysical). The
* regularization is done in the following way:
* *
* - For wetting phase saturations lower than the threshold * - For wetting phase saturations lower than the threshold saturation, the
* saturation, the \f$p_c(S_w)\f$ curve is extrapolated using a * \f$p_c(S_w)\f$ curve is extrapolated using a straight line exhibiting the slope
* straight line exhibiting the slope unregularized capillary * unregularized capillary pressure curve at the threshold saturation.
* pressure curve at the threshold saturation. * - For wetting phase saturations larger than 1, the curve is extrapolated using a
* - For wetting phase saturations larger than 1, the Brooks-Corey * straight line that exhibits the slope of the unregularized curve at \f$S_w =
* curve is extrapolated using a straight line that exhibits the
* slope of the unregularized Brooks-Corey curve at \f$S_w =
* 1\f$ * 1\f$
* *
* \sa BrooksCorey::pcnw * \sa BrooksCorey::pcnw
@ -193,12 +183,6 @@ public:
{ {
const Scalar Sthres = params.pcnwLowSw(); const Scalar Sthres = params.pcnwLowSw();
// make sure that the capilary pressure observes a
// derivative != 0 for 'illegal' saturations. This is
// required for example by newton solvers (if the
// derivative is calculated numerically) in order to get the
// saturation moving to the right direction if it
// temporarily is in an 'illegal' range.
if (Sw <= Sthres) { if (Sw <= Sthres) {
Scalar m = params.pcnwSlopeLow(); Scalar m = params.pcnwSlopeLow();
Scalar pcnw_SwLow = params.pcnwLow(); Scalar pcnw_SwLow = params.pcnwLow();