"""
Estimation of wing wet area
"""
# This file is part of FAST-OAD : A framework for rapid Overall Aircraft Design
# Copyright (C) 2021 ONERA & ISAE-SUPAERO
# FAST is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import numpy as np
from openmdao.core.explicitcomponent import ExplicitComponent
[docs]class ComputeWetAreaWing(ExplicitComponent):
# TODO: Document equations. Cite sources
""" Wing wet area estimation """
[docs] def setup(self):
self.add_input("data:geometry:wing:root:chord", val=np.nan, units="m")
self.add_input("data:geometry:wing:root:y", val=np.nan, units="m")
self.add_input("data:geometry:wing:area", val=np.nan, units="m**2")
self.add_input("data:geometry:fuselage:maximum_width", val=np.nan, units="m")
self.add_output("data:geometry:wing:outer_area", units="m**2")
self.add_output("data:geometry:wing:wetted_area", units="m**2")
[docs] def setup_partials(self):
self.declare_partials(
"data:geometry:wing:outer_area",
[
"data:geometry:wing:area",
"data:geometry:wing:root:y",
"data:geometry:wing:root:chord",
],
method="fd",
)
self.declare_partials(
"data:geometry:wing:wetted_area",
[
"data:geometry:wing:area",
"data:geometry:wing:root:chord",
"data:geometry:fuselage:maximum_width",
],
method="fd",
)
[docs] def compute(self, inputs, outputs):
wing_area = inputs["data:geometry:wing:area"]
l2_wing = inputs["data:geometry:wing:root:chord"]
y2_wing = inputs["data:geometry:wing:root:y"]
width_max = inputs["data:geometry:fuselage:maximum_width"]
s_pf = wing_area - 2 * l2_wing * y2_wing
wet_area_wing = 2 * (wing_area - width_max * l2_wing)
outputs["data:geometry:wing:outer_area"] = s_pf
outputs["data:geometry:wing:wetted_area"] = wet_area_wing