Two Parallel Subsystems in Series

gistfile1.txt

import openmdao.api as om

prob = om.Problem()
model = prob.model

model.add_subsystem('p1', om.IndepVarComp('x', 1.0))

parallel = model.add_subsystem('parallel', om.ParallelGroup())
parallel.add_subsystem('c1', om.ExecComp(['y=-2.0*x']))

parallel2 = model.add_subsystem('parallel_copy', om.ParallelGroup())
parallel2.add_subsystem('comp1', om.ExecComp(['y=-2.0*x']))

model.add_subsystem('con', om.ExecComp('y = 3.0*x'))

model.connect("p1.x", "parallel.c1.x")
model.connect('parallel.c1.y', 'parallel_copy.comp1.x')
model.connect('parallel_copy.comp1.y', 'con.x')

prob.setup(check=True)

prob.run_model()
print('done')