From a282e2247469cf5bed4ae3bc502a0fd0b4704739 Mon Sep 17 00:00:00 2001
From: riddhi1228 <24ume036@lnmiit.ac.in>
Date: Tue, 17 Mar 2026 19:06:22 +0000
Subject: [PATCH 1/2] fix: add CUSTOM_OBJFUNC to historyMap.py and
 CFlowOutput.cpp

- Add if (false) AddHistoryOutput for CUSTOM_OBJFUNC in CFlowOutput.cpp
  so the generator can pick it up in future
- Manually add CUSTOM_OBJFUNC entry to historyMap.py

Fixes #2586
---
 SU2_CFD/src/output/CFlowOutput.cpp | 3 +++
 SU2_PY/SU2/io/historyMap.py        | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/SU2_CFD/src/output/CFlowOutput.cpp b/SU2_CFD/src/output/CFlowOutput.cpp
index d9216b7bdc2f..446db73dc13f 100644
--- a/SU2_CFD/src/output/CFlowOutput.cpp
+++ b/SU2_CFD/src/output/CFlowOutput.cpp
@@ -1789,6 +1789,9 @@ void CFlowOutput::AddAerodynamicCoefficients(const CConfig* config) {
   AddHistoryOutput("AOA", "AoA", ScreenOutputFormat::FIXED, "AOA", "Angle of attack");
 
   AddHistoryOutput("COMBO", "ComboObj", ScreenOutputFormat::SCIENTIFIC, "COMBO", "Combined obj. function value.", HistoryFieldType::COEFFICIENT);
+  // CUSTOM_OBJFUNC is added here so historyMap.py knows how to get its
+  // value, the actual output is COMBO.
+  if (false) AddHistoryOutput("CUSTOM_OBJFUNC", "ComboObj", ScreenOutputFormat::SCIENTIFIC, "COMBO", "Custom obj. function value.", HistoryFieldType::COEFFICIENT);
 }
 
 void CFlowOutput::SetAerodynamicCoefficients(const CConfig* config, const CSolver* flow_solver){
diff --git a/SU2_PY/SU2/io/historyMap.py b/SU2_PY/SU2/io/historyMap.py
index 93a49a2ce0f5..76fdefbe5e63 100644
--- a/SU2_PY/SU2/io/historyMap.py
+++ b/SU2_PY/SU2/io/historyMap.py
@@ -310,6 +310,12 @@
         "HEADER": "ComboObj",
         "TYPE": "COEFFICIENT",
     },
+    "CUSTOM_OBJFUNC": {
+        "DESCRIPTION": "Custom obj. function value.",
+        "GROUP": "COMBO",
+        "HEADER": "ComboObj",
+        "TYPE": "COEFFICIENT",
+    },
     "DEFORM_ITER": {
         "DESCRIPTION": "Linear solver iterations for the mesh " "deformation",
         "GROUP": "DEFORM",

From 13cddd2ee396b21272f5581aea5605935d0cb541 Mon Sep 17 00:00:00 2001
From: riddhi1228 <24ume036@lnmiit.ac.in>
Date: Wed, 18 Mar 2026 05:48:29 +0000
Subject: [PATCH 2/2] fix: use unique header for CUSTOM_OBJFUNC to avoid
 collision with COMBO

Both COMBO and CUSTOM_OBJFUNC had HEADER='ComboObj', causing the history
parser to overwrite COMBO with CUSTOM_OBJFUNC in state[FUNCTIONS],
resulting in KeyError: 'COMBO' in multi-objective optimization tests.
---
 SU2_PY/SU2/io/historyMap.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/SU2_PY/SU2/io/historyMap.py b/SU2_PY/SU2/io/historyMap.py
index 76fdefbe5e63..57392eb82073 100644
--- a/SU2_PY/SU2/io/historyMap.py
+++ b/SU2_PY/SU2/io/historyMap.py
@@ -313,7 +313,7 @@
     "CUSTOM_OBJFUNC": {
         "DESCRIPTION": "Custom obj. function value.",
         "GROUP": "COMBO",
-        "HEADER": "ComboObj",
+        "HEADER": "CustomObj",
         "TYPE": "COEFFICIENT",
     },
     "DEFORM_ITER": {