Ref axis

.github/workflows/oas.yml

@@ -51,6 +51,7 @@ jobs:
     # we need OpenVSP to run vsp tests.
     - name: Install OpenVSP
       run: |
+        sudo apt-get update
         export PYTHON_INCLUDE_DIR=$(python -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())")
         export PYTHON_LIBRARY=$(python -c "import distutils.sysconfig as sysconfig; print(sysconfig.get_config_var('LIBDIR'))")
         export INST_PREFIX=$(python -c "import distutils.sysconfig as sysconfig; print(sysconfig.get_config_var('prefix'))")

openaerostruct/__init__.py

@@ -1 +1 @@
-__version__ = "2.6.2"
+__version__ = "2.7.0"

openaerostruct/docs/user_reference/mesh_surface_dict.rst

@@ -95,10 +95,10 @@ The surface dict will be provided to Groups, including ``Geometry``, ``AeroPoint
       - np.array([0.1, 5])
       - m
       - B-spline control points for chord distribution. Array convention is the same than ``twist_cp``.
-    * - chord_scaling_pos
+    * - ref_axis_pos
       - 0.25
       - 
-      - Chord position at which the chord scaling factor is applied. 1 is the trailing edge, 0 is the leading edge.
+      - Position of reference axis along the chord about which to apply twist, chord, taper, and span geometry transformations. 1 is the trailing edge, 0 is the leading edge.
 
 .. list-table:: Aerodynamics definitions
     :widths: 20 20 5 55

openaerostruct/examples/rectangular_wing/mphys_opt_chord.py

@@ -31,6 +31,7 @@ def setup(self):
             "S_ref_type": "wetted",  # how we compute the wing area,
             # can be 'wetted' or 'projected'
             "twist_cp": np.zeros(3),  # Define twist using 3 B-spline cp's
+            "ref_axis_pos": 0.25,  # Define the reference axis position. 0 is the leading edge, 1 is the trailing edge.
             # Aerodynamic performance of the lifting surface at
             # an angle of attack of 0 (alpha=0).
             # These CL0 and CD0 values are added to the CL and CD

openaerostruct/examples/rectangular_wing/mphys_opt_twist.py

@@ -31,6 +31,7 @@ def setup(self):
             "S_ref_type": "wetted",  # how we compute the wing area,
             # can be 'wetted' or 'projected'
             "twist_cp": np.zeros(3),  # Define twist using 3 B-spline cp's
+            "ref_axis_pos": 0.25,  # Define the reference axis position. 0 is the leading edge, 1 is the trailing edge.
             # Aerodynamic performance of the lifting surface at
             # an angle of attack of 0 (alpha=0).
             # These CL0 and CD0 values are added to the CL and CD

openaerostruct/examples/rectangular_wing/opt_chord.py

@@ -57,7 +57,7 @@
     "S_ref_type": "projected",  # how we compute the wing area,
     # can be 'wetted' or 'projected'
     "chord_cp": np.ones(3),  # Define chord using 3 B-spline cp's
-    "chord_scaling_pos": 0.25,  # Define the chord scaling position. 0 is the leading edge, 1 is the trailing edge.
+    "ref_axis_pos": 0.25,  # Define the reference axis position. 0 is the leading edge, 1 is the trailing edge.
     # distributed along span
     "mesh": mesh,
     # Aerodynamic performance of the lifting surface at

openaerostruct/examples/rectangular_wing/opt_twist.py

@@ -56,6 +56,7 @@
     "S_ref_type": "projected",  # how we compute the wing area,
     # can be 'wetted' or 'projected'
     "twist_cp": np.zeros(3),  # Define twist using 3 B-spline cp's
+    "ref_axis_pos": 0.25,  # Define the reference axis position. 0 is the leading edge, 1 is the trailing edge.
     # distributed along span
     "mesh": mesh,
     # Aerodynamic performance of the lifting surface at

openaerostruct/geometry/geometry_mesh.py

@@ -15,7 +15,6 @@
     ShearZ,
     Rotate,
 )
-import warnings
 
 
 class GeometryMesh(om.Group):
@@ -55,6 +54,11 @@ def initialize(self):
     def setup(self):
         surface = self.options["surface"]
 
+        if "ref_axis_pos" in surface:
+            ref_axis_pos = surface["ref_axis_pos"]
+        else:
+            ref_axis_pos = 0.25  # if no reference axis line is specified : it is the quarter-chord
+
         mesh = surface["mesh"]
         ny = mesh.shape[1]
         mesh_shape = mesh.shape
@@ -73,26 +77,21 @@ def setup(self):
             val = 1.0
             promotes = []
 
-        self.add_subsystem("taper", Taper(val=val, mesh=mesh, symmetry=symmetry), promotes_inputs=promotes)
+        self.add_subsystem(
+            "taper", Taper(val=val, mesh=mesh, symmetry=symmetry, ref_axis_pos=ref_axis_pos), promotes_inputs=promotes
+        )
 
         # 2. Scale X
 
         val = np.ones(ny)
-        chord_scaling_pos = 0.25  # if no scaling position is specified : chord scaling w.r.t quarter of chord
         if "chord_cp" in surface:
             promotes = ["chord"]
-            if "chord_scaling_pos" in surface:
-                chord_scaling_pos = surface["chord_scaling_pos"]
         else:
-            if "chord_scaling_pos" in surface:
-                warnings.warn(
-                    "Chord_scaling_pos has been specified but no chord design variable available", stacklevel=2
-                )
             promotes = []
 
         self.add_subsystem(
             "scale_x",
-            ScaleX(val=val, mesh_shape=mesh_shape, chord_scaling_pos=chord_scaling_pos),
+            ScaleX(val=val, mesh_shape=mesh_shape, ref_axis_pos=ref_axis_pos),
             promotes_inputs=promotes,
         )
 
@@ -124,15 +123,17 @@ def setup(self):
             val = surface["span"]
         else:
             # Compute span. We need .real to make span to avoid OpenMDAO warnings.
-            quarter_chord = 0.25 * mesh[-1, :, :] + 0.75 * mesh[0, :, :]
-            span = max(quarter_chord[:, 1]).real - min(quarter_chord[:, 1]).real
+            ref_axis = ref_axis_pos * mesh[-1, :, :] + (1 - ref_axis_pos) * mesh[0, :, :]
+            span = max(ref_axis[:, 1]).real - min(ref_axis[:, 1]).real
             if symmetry:
                 span *= 2.0
             val = span
             promotes = []
 
         self.add_subsystem(
-            "stretch", Stretch(val=val, mesh_shape=mesh_shape, symmetry=symmetry), promotes_inputs=promotes
+            "stretch",
+            Stretch(val=val, mesh_shape=mesh_shape, symmetry=symmetry, ref_axis_pos=ref_axis_pos),
+            promotes_inputs=promotes,
         )
 
         # 6. Shear Y
@@ -179,7 +180,7 @@ def setup(self):
 
         self.add_subsystem(
             "rotate",
-            Rotate(val=val, mesh_shape=mesh_shape, symmetry=symmetry),
+            Rotate(val=val, mesh_shape=mesh_shape, symmetry=symmetry, ref_axis_pos=ref_axis_pos),
             promotes_inputs=promotes,
             promotes_outputs=["mesh"],
         )