fastoad.models.aerodynamics.components.cd_compressibility module¶
Compressibility drag computation.
- class fastoad.models.aerodynamics.components.cd_compressibility.CdCompressibility(**kwargs)[source]¶
Bases:
openmdao.core.explicitcomponent.ExplicitComponent
Computation of drag increment due to compressibility effects.
Formula from §4.2.4 of [DCAC14]. This formula can be used for aircraft before year 2000. Earlier aircraft have more optimized wing profiles that are expected to limit the compressibility drag below 2 drag counts. Until a better model can be provided, the variable tuning:aerodynamics:aircraft:cruise:CD:compressibility:characteristic_mach_increment allows to move the characteristic Mach number, thus moving the CD divergence to higher Mach numbers.
Store some bound methods so we can detect runtime overrides.
- Parameters
**kwargs (dict of keyword arguments) – Keyword arguments that will be mapped into the Component options.
- setup_partials()[source]¶
Declare partials.
This is meant to be overridden by component classes. All partials should be declared here since this is called after all size/shape information is known for all variables.
- compute(inputs, outputs)[source]¶
Compute outputs given inputs. The model is assumed to be in an unscaled state.
- Parameters
inputs (Vector) – unscaled, dimensional input variables read via inputs[key]
outputs (Vector) – unscaled, dimensional output variables read via outputs[key]
discrete_inputs (dict or None) – If not None, dict containing discrete input values.
discrete_outputs (dict or None) – If not None, dict containing discrete output values.