Corrected and simplified GiantBranch::CalculateRadialExtentConvectiveEnvelope()

Author: Ilya Mandel

src/GiantBranch.cpp

@@ -694,15 +694,9 @@ double GiantBranch::CalculateRadialExtentConvectiveEnvelope() const{
     std::tie(convectiveEnvelopeMass, convectiveEnvelopeMassMax) = CalculateConvectiveEnvelopeMass();
     if (utils::Compare(convectiveEnvelopeMass, 0.0) <= 0 || utils::Compare(convectiveEnvelopeMassMax, 0.0) <= 0 ) return 0.0;   // massless convective envelope has zero radial extent
 
-    double convectiveCoreMass   = CalculateConvectiveCoreMass();
     double convectiveCoreRadius = CalculateConvectiveCoreRadius();
-    // assume that the final radiative intershell (if any) would have a density that is a geometric mean of the core density and total density
-    double radiativeIntershellMass           = m_Mass - convectiveCoreMass - convectiveEnvelopeMassMax;
-    double convectiveCoreRadiusCubed         = convectiveCoreRadius * convectiveCoreRadius * convectiveCoreRadius;
-    double radiativeIntershellDensity        = 1.0 / (4.0 /3.0 * M_PI) * std::sqrt(convectiveCoreMass / convectiveCoreRadiusCubed * m_Mass / m_Radius / m_Radius / m_Radius);
-    double outerEdgeRadiativeIntershellCubed = radiativeIntershellMass / (4.0 / 3.0 * M_PI * radiativeIntershellDensity) + convectiveCoreRadiusCubed;
 
-    return std::sqrt(convectiveEnvelopeMass/convectiveEnvelopeMassMax) * (m_Radius - std::cbrt(outerEdgeRadiativeIntershellCubed));
+    return std::sqrt(convectiveEnvelopeMass/convectiveEnvelopeMassMax) * (m_Radius - convectiveCoreRadius);
 }
 
 

src/changelog.h

@@ -1553,7 +1553,9 @@
 //                                      - Added several outputs to provide more information and aid code testing: SEMI_MAJOR_AXIS_POST_STAGE_1_CE (for the 2-stage CE); BINDING_ENERGY_CONVECTIVE_ENVELOPE, CONVECTIVE_ENV_MASS, LAMBDA_CONVECTIVE_ENVELOPE (convective envelope binding energy,  mass, and lambda, respectively, Picker prescription)
 //                                      - Ensure that the MANDEL main sequence core mass prescription never provides a core mass exceeding the total mass
 //                                      - Corrected several erroneous comments, cleaned up a few function definitions
+//  03.18.07    IM - May 11, 2025   - Defect repair:
+//                                      - Corrected and simplified GiantBranch::CalculateRadialExtentConvectiveEnvelope()
 
-const std::string VERSION_STRING = "03.18.06";
+const std::string VERSION_STRING = "03.18.07";
 
 # endif // __changelog_h__