Version 1.2

Version 1.2 - Transonic correction and analytical gradients

This version mainly features a transonic solver and analytical pressure derivatives.

Changes

• Add transonic correction
• Add analytical gradients
• Add feature to deform the body
• Fix calculation of motion-induced velocity and unsteady pressure
• Refactor APIs and utilities

Notes

Transonic correction
The unsteady pressure solution can now be corrected by higher-fidelity data (typically obtained from CFD) to include transonic and viscous effects.
Analytical gradients
Although CoDiPack works well, its memory footprint is too large for practical unsteady cases (see #6). Analytical pressure and aerodynamic forces gradients have therefore been implemented so that flutter constrained optimization can be performed within a reasonable computational time.
Body deformation
The body nodes can now be set to new positions for aeroelastic and optimization purposes.
Formulation fixes
The calculation of the surface velocity induced by a rigid pitching motion has been corrected to use original instead of compressible coordinates. Additionally, a mistake in the calculation of the unsteady pressure coefficient has been fixed.
Refactoring
The default values in the API have been refactored. The slicing utility now also outputs z-coordinates.

Tests

• Ubuntu 22.04 (gcc 11, python 3.10)

sdpm/api/om.py

@@ -66,6 +66,8 @@ class SdpmSolver(om.ExplicitComponent):
         # self.declare_partials(of=['Q_re', 'Q_im'], wrt=['x_aero', 'q_aero'], method='exact')
 
     def compute(self, inputs, outputs):
+        # Update coordinates
+        self.bdy.setNodes(inputs['x_aero0'].reshape((len(self.bdy.getNodes()), 3)))
         # Update modes
         for i in range(self.nm):
             x_modes = np.zeros((len(self.bdy.getNodes()), 3)) # 3 DOF per mode and node