Fix sorting bug (#147)

Author: 1-Bart-1

CHANGELOG.md

@@ -3,6 +3,13 @@ SPDX-FileCopyrightText: 2025 Uwe Fechner, Bart van de Lint
 SPDX-License-Identifier: MPL-2.0
 -->
 
+# v0.6.1 23-02-2026
+
+## Fixed
+- Disable VSM auto-sorting of sections (`sort_sections=false`) in all
+  VortexStepMethod calls. Auto-sorting silently broke the correspondence
+  between VSM sections and structural point indices / group mappings.
+
 # v0.6.0 21-02-2026
 
 ## Changed

Project.toml

@@ -1,6 +1,6 @@
 name = "SymbolicAWEModels"
 uuid = "9c9a347c-5289-41db-a9b9-25ccc76c3360"
-version = "0.6.0"
+version = "0.6.1"
 authors = ["Bart van de Lint <bart@vandelint.net> and contributors"]
 
 [deps]

src/system_structure/utilities.jl

@@ -360,7 +360,7 @@ function reinit!(sys_struct::SystemStructure, set::Settings;
         for wing in wings
             # Recreate VSM wing from settings
             wing.vsm_wing = VortexStepMethod.Wing(set, sys_struct.vsm_set;
-                prn=false)
+                prn=false, sort_sections=false)
             wing.vsm_aero = VortexStepMethod.BodyAerodynamics([wing.vsm_wing])
             wing.vsm_solver = VortexStepMethod.Solver(wing.vsm_aero;
                 solver_type=VortexStepMethod.NONLIN,

src/system_structure/wing.jl

@@ -374,7 +374,8 @@ function VSMWing(name, set::Settings,
     origin_ref = isnothing(origin) ? nothing : _to_name_ref(origin)
 
     # Create VSM wing, aero, and solver
-    vsm_wing = VortexStepMethod.Wing(set, vsm_set; prn=false)
+    vsm_wing = VortexStepMethod.Wing(set, vsm_set; prn=false,
+        sort_sections=false)
     vsm_aero = VortexStepMethod.BodyAerodynamics([vsm_wing])
     vsm_solver = VortexStepMethod.Solver(vsm_aero;
         solver_type=VortexStepMethod.NONLIN,

src/vsm_refine.jl

@@ -328,7 +328,7 @@ function update_vsm_wing_from_structure!(wing::VSMWing, points::AbstractVector{P
         end
     end
 
-    refine!(wing.vsm_wing; recompute_mapping=false)
+    refine!(wing.vsm_wing; recompute_mapping=false, sort_sections=false)
     VortexStepMethod.reinit!(wing.vsm_aero)
     # Do NOT call reinit! on wing - only modify sections!
     # body_aero reinit! will update panels from modified sections (called in update_vsm!)