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Some adjustments to the skin friction drag solvers. #127

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merged 5 commits into from
Feb 5, 2024
Merged

Some adjustments to the skin friction drag solvers. #127

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f205431
Tighten up tolerance of skin friction solver.
Kenneth-T-Moore Feb 1, 2024
e6665a1
Added a residual scaling to Re, since it is large.
Kenneth-T-Moore Feb 2, 2024
91e475c
Added a residual scaling to Re, since it is large.
Kenneth-T-Moore Feb 2, 2024
a162439
Merge branch 'main' of github.com:OpenmDAO/om-Aviary into drag_tol
Kenneth-T-Moore Feb 2, 2024
fd8abb5
Merge branch 'main' into drag_tol
johnjasa Feb 5, 2024
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5 changes: 3 additions & 2 deletions aviary/subsystems/aerodynamics/flops_based/skin_friction.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,8 @@ def __init__(self, **kwargs):
self.TAW = 1.0
self.sea_level_pressure = 14.6959 * 144 # psi -> psf

self.nonlinear_solver = om.NewtonSolver(solve_subsystems=False)
self.nonlinear_solver = om.NewtonSolver(solve_subsystems=False,
atol=1e-12, rtol=1e-12)
self.linear_solver = om.DirectSolver()
self.nonlinear_solver.options['iprint'] = -1
self.linear_solver.options['iprint'] = -1
Expand Down Expand Up @@ -61,7 +62,7 @@ def setup(self):

self.add_output('cf_iter', np.ones((nn, nc)), units='unitless')
self.add_output('skin_friction_coeff', np.ones((nn, nc)), units='unitless')
self.add_output('Re', np.ones((nn, nc)), units='unitless')
self.add_output('Re', np.ones((nn, nc)), units='unitless', res_ref=1e6)
self.add_output('wall_temp', np.ones((nn, nc)), units='degR')

def setup_partials(self):
Expand Down
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