vulcan::aero Namespace Reference

Classes
struct	AeroState
	Complete aerodynamic state at a flight condition. More...

Functions
template<typename Scalar>
Scalar	dynamic_pressure (const Scalar &density, const Scalar &velocity)
	Dynamic pressure.
template<typename Scalar>
Scalar	mach_number (const Scalar &velocity, const Scalar &speed_of_sound)
	Mach number.
template<typename Scalar>
Scalar	reynolds_number (const Scalar &density, const Scalar &velocity, const Scalar &length, const Scalar &viscosity)
	Reynolds number.
template<typename Scalar>
Scalar	airspeed (const Vec3< Scalar > &velocity_ground, const Vec3< Scalar > &velocity_wind)
	Compute airspeed from ground velocity and wind.
template<typename Scalar>
Scalar	airspeed (const Vec3< Scalar > &velocity)
	Compute airspeed magnitude from velocity vector.
template<typename Scalar>
Vec2< Scalar >	aero_angles (const Vec3< Scalar > &velocity_body)
	Compute aerodynamic angles from velocity in body frame.
template<typename Scalar>
AeroState< Scalar >	aero_state (const Scalar &density, const Scalar &speed_of_sound, const Scalar &viscosity, const Vec3< Scalar > &velocity_body, const Scalar &char_length)
	Compute complete aerodynamic state.

Function Documentation

aero_angles()

template<typename Scalar>

Vec2< Scalar > vulcan::aero::aero_angles

(

const Vec3< Scalar > &

velocity_body

)

Compute aerodynamic angles from velocity in body frame.

These are the fundamental aerodynamic angles used for force calculations:

• Alpha (angle of attack): rotation about body Y-axis
• Beta (sideslip angle): rotation about body Z-axis

Sign conventions:

• Alpha positive: nose up relative to velocity
• Beta positive: wind from right (velocity has positive Y component)

Template Parameters

Scalar

Scalar type (double or casadi::MX)

Parameters

velocity_body

Velocity vector in body frame [m/s]

Returns

[alpha, beta] aerodynamic angles [rad]

aero_state()

template<typename Scalar>

AeroState< Scalar > vulcan::aero::aero_state	(	const Scalar &	density,
		const Scalar &	speed_of_sound,
		const Scalar &	viscosity,
		const Vec3< Scalar > &	velocity_body,
		const Scalar &	char_length )

Compute complete aerodynamic state.

Template Parameters

Scalar

Scalar type (double or casadi::MX)

Parameters

density	Air density [kg/m³]
speed_of_sound	Speed of sound [m/s]
viscosity	Dynamic viscosity [Pa·s]
velocity_body	Velocity in body frame [m/s]
char_length	Characteristic length for Reynolds number [m]

Returns

Complete aerodynamic state

airspeed() [1/2]

template<typename Scalar>

Scalar vulcan::aero::airspeed

(

const Vec3< Scalar > &

velocity

)

Compute airspeed magnitude from velocity vector.

Template Parameters

Scalar

Scalar type (double or casadi::MX)

Parameters

velocity

Velocity vector [m/s]

Returns

Airspeed magnitude [m/s]

airspeed() [2/2]

template<typename Scalar>

Scalar vulcan::aero::airspeed	(	const Vec3< Scalar > &	velocity_ground,
		const Vec3< Scalar > &	velocity_wind )

Compute airspeed from ground velocity and wind.

V_air = ||V_ground - V_wind||

Template Parameters

Scalar

Scalar type (double or casadi::MX)

Parameters

velocity_ground	Ground-relative velocity vector [m/s]
velocity_wind	Wind velocity vector [m/s]

Returns

Airspeed magnitude [m/s]

dynamic_pressure()

template<typename Scalar>

Scalar vulcan::aero::dynamic_pressure	(	const Scalar &	density,
		const Scalar &	velocity )

Dynamic pressure.

q = 0.5 * rho * V²

Template Parameters

Scalar

Scalar type (double or casadi::MX)

Parameters

density	Air density [kg/m³]
velocity	Airspeed magnitude [m/s]

Returns

Dynamic pressure [Pa]

mach_number()

template<typename Scalar>

Scalar vulcan::aero::mach_number	(	const Scalar &	velocity,
		const Scalar &	speed_of_sound )

Mach number.

M = V / a

Template Parameters

Scalar

Scalar type (double or casadi::MX)

Parameters

velocity	Airspeed magnitude [m/s]
speed_of_sound	Local speed of sound [m/s]

Returns

Mach number [-]

reynolds_number()

template<typename Scalar>

Scalar vulcan::aero::reynolds_number	(	const Scalar &	density,
		const Scalar &	velocity,
		const Scalar &	length,
		const Scalar &	viscosity )

Reynolds number.

Re = rho * V * L / mu

Template Parameters

Scalar

Scalar type (double or casadi::MX)

Parameters

density	Air density [kg/m³]
velocity	Airspeed magnitude [m/s]
length	Characteristic length [m]
viscosity	Dynamic viscosity [Pa·s]

Returns

Reynolds number [-]