New MPL property: Brooks&Corey relative permeability

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/c_RelPermBrooksCorey.md

@@ -0,0 +1 @@
+The relative permeability function proposed by Brooks&Corey (1964) \cite BrooksCorey1964.

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/t_k_rel_min_gas.md

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+The minimal relative permeability of the gas (or non-wetting) phase.

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/t_k_rel_min_liquid.md

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+The minimal relative permeability of the liquid (or wetting) phase.

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/t_lambda.md

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+Exponent of the Brooks&Corey relative permeability function.

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/t_residual_gas_saturation.md

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+The smallest degree of saturation of the gas (or non-wetting) phase in the medium.

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/t_residual_liquid_saturation.md

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+The smallest degree of saturation of the liquid (or wetting) phase in the medium.

MaterialLib/MPL/CreateProperty.cpp

@@ -65,6 +65,11 @@ std::unique_ptr<MaterialPropertyLib::Property> createProperty(
         return createSaturationBrooksCorey(config);
     }
 
+    if (boost::iequals(property_type, "RelPermBrooksCorey"))
+    {
+        return createRelPermBrooksCorey(config);
+    }
+
     // If none of the above property types are found, OGS throws an error.
     OGS_FATAL("The specified component property type '%s' was not recognized",
               property_type.c_str());

MaterialLib/MPL/Properties/CreateProperties.h

@@ -17,4 +17,5 @@
 #include "CreateIdealGasLaw.h"
 #include "CreateLinearProperty.h"
 #include "CreateParameterProperty.h"
+#include "CreateRelPermBrooksCorey.h"
 #include "CreateSaturationBrooksCorey.h"

MaterialLib/MPL/Properties/CreateRelPermBrooksCorey.cpp

@@ -0,0 +1,50 @@
+/**
+ * \copyright
+ * Copyright (c) 2012-2019, OpenGeoSys Community (http://www.opengeosys.org)
+ *            Distributed under a Modified BSD License.
+ *              See accompanying file LICENSE.txt or
+ *              http://www.opengeosys.org/project/license
+ *
+ */
+
+#include "BaseLib/ConfigTree.h"
+#include "RelPermBrooksCorey.h"
+
+namespace MaterialPropertyLib
+{
+std::unique_ptr<RelPermBrooksCorey> createRelPermBrooksCorey(
+    BaseLib::ConfigTree const& config)
+{
+    // check is reading the parameter, not peeking it...
+    //! \ogs_file_param{prj__media__medium__properties__property__RelPermBrooksCorey}
+    config.checkConfigParameter("type", "RelPermBrooksCorey");
+    DBUG("Create RelPermBrooksCorey medium property");
+
+    auto const residual_liquid_saturation =
+        //! \ogs_file_param{prj__media__medium__properties__property__RelPermBrooksCorey__residual_liquid_saturation}
+        config.getConfigParameter<double>("residual_liquid_saturation");
+    auto const residual_gas_saturation =
+        //! \ogs_file_param{prj__media__medium__properties__property__RelPermBrooksCorey__residual_gas_saturation}
+        config.getConfigParameter<double>("residual_gas_saturation");
+    auto const min_relative_permeability_liquid =
+        //! \ogs_file_param{prj__media__medium__properties__property__RelPermBrooksCorey__k_rel_min_liquid}
+        config.getConfigParameter<double>("min_relative_permeability_liquid");
+    auto const min_relative_permeability_gas =
+        //! \ogs_file_param{prj__media__medium__properties__property__RelPermBrooksCorey__k_rel_min_gas}
+        config.getConfigParameter<double>("min_relative_permeability_gas");
+    auto const exponent =
+        //! \ogs_file_param{prj__media__medium__properties__property__RelPermBrooksCorey__lambda}
+        config.getConfigParameter<double>("lambda");
+    if (exponent == 0.)
+    {
+        OGS_FATAL("Exponent 'lambda' must be positive.");
+    }
+
+    return std::make_unique<RelPermBrooksCorey>(
+        residual_liquid_saturation,
+        residual_gas_saturation,
+        min_relative_permeability_liquid,
+        min_relative_permeability_gas,
+        exponent);
+}
+}  // namespace MaterialPropertyLib

MaterialLib/MPL/Properties/CreateRelPermBrooksCorey.h

@@ -0,0 +1,26 @@
+/**
+ * \copyright
+ * Copyright (c) 2012-2019, OpenGeoSys Community (http://www.opengeosys.org)
+ *            Distributed under a Modified BSD License.
+ *              See accompanying file LICENSE.txt or
+ *              http://www.opengeosys.org/project/license
+ *
+ */
+
+#pragma once
+
+namespace BaseLib
+{
+class ConfigTree;
+}
+
+namespace MaterialPropertyLib
+{
+class RelPermBrooksCorey;
+}
+
+namespace MaterialPropertyLib
+{
+std::unique_ptr<RelPermBrooksCorey> createRelPermBrooksCorey(
+    BaseLib::ConfigTree const& config);
+}  // namespace MaterialPropertyLib

MaterialLib/MPL/Properties/Properties.h

@@ -17,4 +17,5 @@
 #include "IdealGasLaw.h"
 #include "LinearProperty.h"
 #include "ParameterProperty.h"
+#include "RelPermBrooksCorey.h"
 #include "SaturationBrooksCorey.h"

MaterialLib/MPL/Properties/RelPermBrooksCorey.cpp

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+/**
+ * \author Norbert Grunwald
+ * \date   02.07.2018
+ * \brief
+ *
+ * \copyright
+ * Copyright (c) 2012-2018, OpenGeoSys Community (http://www.opengeosys.org)
+ *            Distributed under a Modified BSD License.
+ *              See accompanying file LICENSE.txt or
+ *              http://www.opengeosys.org/project/license
+ *
+ */
+
+#include "MaterialLib/MPL/Properties/RelPermBrooksCorey.h"
+#include "MaterialLib/MPL/Medium.h"
+
+#include <algorithm>
+#include <cmath>
+
+namespace MaterialPropertyLib
+{
+RelPermBrooksCorey::RelPermBrooksCorey(
+    const double residual_liquid_saturation,
+    const double residual_gas_saturation,
+    const double min_relative_permeability_liquid,
+    const double min_relative_permeability_gas,
+    const double exponent)
+
+    : _residual_liquid_saturation(residual_liquid_saturation),
+      _residual_gas_saturation(residual_gas_saturation),
+      _min_relative_permeability_liquid(min_relative_permeability_liquid),
+      _min_relative_permeability_gas(min_relative_permeability_gas),
+      _exponent(exponent){};
+
+PropertyDataType RelPermBrooksCorey::value(
+    VariableArray const& variable_array,
+    ParameterLib::SpatialPosition const& pos,
+    double const t) const
+{
+    /// here, an extra computation of saturation is forced, guaranteeing a
+    /// correct value. In order to speed up the computing time, saturation could
+    /// be insertred into the primary variable array after it is computed in the
+    /// FEM assembly.
+    auto const s_L = _medium->property(PropertyType::saturation)
+                         .template value<double>(variable_array, pos, t);
+
+    auto const s_L_res = _residual_liquid_saturation;
+    auto const s_L_max = 1. - _residual_gas_saturation;
+    auto const k_rel_min_LR = _min_relative_permeability_liquid;
+    auto const k_rel_min_GR = _min_relative_permeability_gas;
+
+    auto const lambda = _exponent;
+
+    auto const s_eff = (s_L - s_L_res) / (s_L_max - s_L_res);
+
+    if (s_eff >= 1.0)
+    {
+        // fully saturated medium
+        return Pair{{1.0, k_rel_min_GR}};
+    }
+    if (s_eff <= 0.0)
+    {
+        // dry medium
+        return Pair{{k_rel_min_LR, 1.0}};
+    }
+
+    auto const k_rel_LR = std::pow(s_eff, (2. + 3. * lambda) / lambda);
+    auto const k_rel_GR = (1. - s_eff) * (1. - s_eff) *
+                          (1. - std::pow(s_eff, (2. + lambda) / lambda));
+
+    const Pair kRel = {std::max(k_rel_LR, k_rel_min_LR),
+                       std::max(k_rel_GR, k_rel_min_GR)};
+    return kRel;
+}
+PropertyDataType RelPermBrooksCorey::dValue(
+    VariableArray const& variable_array, Variable const primary_variable,
+    ParameterLib::SpatialPosition const& pos, double const t) const
+{
+    (void)primary_variable;
+    assert((primary_variable == Variable::liquid_saturation) &&
+           "RelPermBrooksCorey::dValue is implemented for "
+           " derivatives with respect to liquid saturation only.");
+    auto const s_L = _medium->property(PropertyType::saturation)
+                         .template value<double>(variable_array, pos, t);
+
+    auto const s_L_res = _residual_liquid_saturation;
+    auto const s_L_max = 1. - _residual_gas_saturation;
+    auto const lambda = _exponent;
+
+    auto const s_eff = (s_L - s_L_res) / (s_L_max - s_L_res);
+    if ((s_eff < 0.) || (s_eff > 1.))
+        return Pair{0., 0.};
+
+    auto const d_se_d_sL = 1. / (s_L_max - s_L_res);
+    auto const dk_rel_LRdse =
+        (3 * lambda + 2.) / lambda * std::pow(s_eff, 2. / lambda + 2.);
+
+    auto const dk_rel_LRdsL = dk_rel_LRdse * d_se_d_sL;
+
+    auto const _2L_L = (2. + lambda) / lambda;
+    auto const dk_rel_GRdse =
+        -2. * (1 - s_eff) * (1. - std::pow(s_eff, _2L_L)) -
+        _2L_L * std::pow(s_eff, _2L_L - 1.) * (1. - s_eff) * (1. - s_eff);
+
+    auto const dk_rel_GRdsL = dk_rel_GRdse * d_se_d_sL;
+    const Pair dkReldsL = {{dk_rel_LRdsL, dk_rel_GRdsL}};
+
+    return dkReldsL;
+}
+
+}  // namespace MaterialPropertyLib

MaterialLib/MPL/Properties/RelPermBrooksCorey.h

@@ -0,0 +1,75 @@
+/**
+ * \author Norbert Grunwald
+ * \date   27.06.2018
+ * \brief
+ *
+ * \copyright
+ * Copyright (c) 2012-2019, OpenGeoSys Community (http://www.opengeosys.org)
+ *            Distributed under a Modified BSD License.
+ *              See accompanying file LICENSE.txt or
+ *              http://www.opengeosys.org/project/license
+ *
+ */
+#pragma once
+
+#include "BaseLib/ConfigTree.h"
+#include "MaterialLib/MPL/Property.h"
+
+namespace MaterialPropertyLib
+{
+class Medium;
+class Phase;
+class Component;
+/**
+ * \class RelPermBrooksCorey
+ * \brief Relative permeability function proposed by Brooks&Corey
+ * \details This property must be a medium property, it
+ * computes the permeability reduction due to saturation as function
+ * of capillary pressure.
+ */
+class RelPermBrooksCorey final : public Property
+{
+private:
+    Medium* _medium;
+    const double _residual_liquid_saturation;
+    const double _residual_gas_saturation;
+    const double _min_relative_permeability_liquid;
+    const double _min_relative_permeability_gas;
+    const double _exponent;
+
+public:
+    RelPermBrooksCorey(const double /*residual_liquid_saturation*/,
+                       const double /*residual_gas_saturation*/,
+                       const double /*_min_relative_permeability_liquid*/,
+                       const double /*_min_relative_permeability_gas*/,
+                       const double /*exponent*/
+    );
+    /// This method assigns a pointer to the meterial object that is the owner
+    /// of this property
+    void setScale(
+        std::variant<Medium*, Phase*, Component*> scale_pointer) override
+    {
+        if (std::holds_alternative<Medium*>(scale_pointer))
+        {
+            _medium = std::get<Medium*>(scale_pointer);
+        }
+        else
+        {
+            OGS_FATAL(
+                "The property 'RelPermBrooksCorey' is implemented on the "
+                "'media' scale only.");
+        }
+    }
+
+    /// Those methods override the base class implementations and
+    /// actually compute and set the property _values and _dValues.
+    PropertyDataType value(VariableArray const& variable_array,
+                           ParameterLib::SpatialPosition const& pos,
+                           double const t) const override;
+    PropertyDataType dValue(VariableArray const& variable_array,
+                            Variable const variable,
+                            ParameterLib::SpatialPosition const& pos,
+                            double const t) const override;
+};
+
+}  // namespace MaterialPropertyLib