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Added linear solver for cases where states solved via optimizer have input_initial=True #991

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Sep 14, 2023
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Added linear solver for cases where states solved via optimizer have input_initial=True #991

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1 change: 1 addition & 0 deletions dymos/examples/finite_burn_orbit_raise/finite_burn_orbit_raise_problem.py
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Original file line number Diff line number Diff line change
@@ -224,6 +224,7 @@ def two_burn_orbit_raise_problem(transcription='gauss-lobatto', optimizer='SLSQP
p.driver.opt_settings['nlp_scaling_method'] = 'gradient-based' # for faster convergence
p.driver.opt_settings['alpha_for_y'] = 'safer-min-dual-infeas'
p.driver.opt_settings['mu_strategy'] = 'monotone'
p.driver.opt_settings['derivative_test'] = 'first-order'
if show_output:
p.driver.opt_settings['print_level'] = 5

2 changes: 0 additions & 2 deletions dymos/examples/finite_burn_orbit_raise/test/test_ex_two_burn_orbit_raise.py
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Original file line number Diff line number Diff line change
@@ -39,8 +39,6 @@ def test_ex_two_burn_orbit_raise_connected(self):
compressed=False, optimizer=optimizer,
show_output=False, connected=True, run_driver=True)

p.check_totals(compact_print=True)

if p.model.traj.phases.burn2 in p.model.traj.phases._subsystems_myproc:
assert_near_equal(p.get_val('traj.burn2.states:deltav')[0], 0.3995,
tolerance=4.0E-3)
3 changes: 1 addition & 2 deletions dymos/transcriptions/pseudospectral/pseudospectral_base.py
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Original file line number Diff line number Diff line change
@@ -95,6 +95,7 @@ def setup_states(self, phase):
if self.any_solved_segs or self.any_connected_opt_segs:
indep = StateIndependentsComp(grid_data=grid_data,
state_options=phase.state_options)
indep.linear_solver = om.DirectSolver()
else:
indep = om.IndepVarComp()

@@ -513,8 +514,6 @@ def configure_solvers(self, phase):
newton.options['stall_limit'] = 3
newton.linesearch = om.BoundsEnforceLS()

# even though you don't need a nl_solver for connections, you still ln_solver since its implicit
if self.any_solved_segs or self._implicit_duration:
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Should the next 2 lines be de-dented?

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Oh, didn't notice the line cut. This is fine.

if isinstance(phase.linear_solver, om.LinearRunOnce):
phase.linear_solver = om.DirectSolver()