"""
Creation of a group to ease the use of the Xfoil Polar ExternalCodeComp in the block analysis
function.
"""
# This file is part of FAST-OAD_CS23 : A framework for rapid Overall Aircraft Design
# Copyright (C) 2022 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
from openmdao.core.group import Group
from stdatm import Atmosphere
from .xfoil_polar import _DEFAULT_AIRFOIL_FILE, XfoilPolar
[docs]class XfoilGroup(Group):
[docs] def initialize(self):
self.options.declare("airfoil_folder_path", default=None, types=str, allow_none=True)
self.options.declare("airfoil_file", default=_DEFAULT_AIRFOIL_FILE, types=str)
self.options.declare("compute_negative_air_angle", default=False, types=bool)
[docs] def setup(self):
self.add_subsystem(
"pre_xfoil_group_prep",
_XfoilGroupPrep(),
promotes=["data:TLAR:v_approach", "data:Xfoil_pre_processing:reynolds"],
)
self.add_subsystem(
"pre_xfoil_polar",
XfoilPolar(
airfoil_folder_path=self.options["airfoil_folder_path"],
airfoil_file=self.options["airfoil_file"],
alpha_end=20.0,
activate_negative_angle=True,
),
promotes=[],
)
self.connect("pre_xfoil_group_prep.xfoil_group:mach", "pre_xfoil_polar.xfoil:mach")
self.connect("pre_xfoil_group_prep.xfoil_group:reynolds", "pre_xfoil_polar.xfoil:reynolds")
class _XfoilGroupPrep(ExplicitComponent):
"""Compute the correct mach number for the Xfoil preprocessing"""
def setup(self):
self.add_input("data:TLAR:v_approach", val=np.nan, units="m/s")
self.add_input("data:Xfoil_pre_processing:reynolds", val=np.nan)
self.add_output("xfoil_group:mach")
self.add_output("xfoil_group:reynolds")
def compute(self, inputs, outputs, discrete_inputs=None, discrete_outputs=None):
sos = Atmosphere(0.0).speed_of_sound
outputs["xfoil_group:mach"] = inputs["data:TLAR:v_approach"] / sos
outputs["xfoil_group:reynolds"] = inputs["data:Xfoil_pre_processing:reynolds"]