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calc_cf.py
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calc_cf.py
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import openmdao.api as om
import omtools.api as ot
import numpy as np
from lam_func import LamFunc
from turb_func import TurbFunc
class CalcCf(ot.Group):
def initialize(self):
pass
def setup(self):
density = self.declare_input('air_density', val=1.225)
viscosity = self.declare_input('air_viscosity', val=1.789e-5)
a = self.declare_input('a', val=343)
length = self.declare_input('length', val=1.)
velocity = self.declare_input('velocity_cruise', val=50.)
k = 0.7e-5
RE_CRIT_TURB = 38.21*(length/k)**1.053
x_crit_turb = RE_CRIT_TURB*viscosity/(velocity*density)
if length > x_crit_turb:
x = length
self.register_output('x', x)
lam_comp_group = LamFunc()
self.add_subsystem('lam_comp_group', lam_comp_group, promotes=['*'])
cf_lam_comp = self.declare_input('cf_lam_comp')
turb_comp_group = TurbFunc()
self.add_subsystem('turb_comp_group', turb_comp_group, promotes=['*'])
cf_turb_comp = self.declare_input('cf_turb_comp')
cf = (cf_lam_comp*x_crit_turb + \
cf_turb_comp*(length-x_crit_turb)) \
/length
else:
x = length
cf = LamFunc()
x = length
turb_comp_group = TurbFunc()
self.add_subsystem('turb_comp_group', turb_comp_group, promotes=['*'])
cf_turb_comp = self.declare_input('cf_turb_comp')
cf = cf_turb_comp
self.register_output('cf', cf)