DSAeroToolsSim.Models.Parasite package

DSAeroToolsSim.Models.Parasite.componentParasite module

Component-wise Parasite Drag Model

DSAeroToolsSim

REQUIRED INPUT STRUCTURE
Vehicle.GeometryModel.Sref
Vehicle.GeometryModel.surfaces	Defined automatically by GeometryModel
Vehicle.ParasiteModel.cfType	Optional, defaults to “prandtlTurb”
Vehicle.ParasiteModel.formFactorType	Optional, defaults to “hoernerWingLike”
Vehicle.ParasiteModel.components	Optional, list of <Component>
	List of additional drag-generating components
	Must have “length” or “mac” + “Swet” defined
Vehicle.State.Trajectory.V[-1]	Latest velocity must have been already appended
Vehicle.State.Atmosphere.rho[-1]	Latest density must have been already appended
Vehicle.State.Atmosphere.mu[-1]	Latest dynamic viscosity must have been appended

DSAeroToolsSim.Models.Parasite.componentParasite.JSONify(Vehicle)

JSONification of ParasiteModel

Called by Vehicle’s JSONify method. This function creates a JSON-compatible dictionary of the ParasiteModel attributes.

The function does not return the dictionary, but rather stores it in the Vehicle’s ParasiteModel.JSON attribute.

Parameters:

Vehicle (Vehicle) – Vehicle whose ParasiteModel is being JSONified

DSAeroToolsSim.Models.Parasite.componentParasite.componentParasite(Vehicle)

Parasitic Drag Coefficient Buildup

Appends ‘CD0’ to Vehicle.State.Aero.CD0.

User can specify what boundary layer friction coefficient and form factor correction to use.

By default, the model uses:

• Friction Coefficient: Prandtl’s Turbulent Flow Approximation

• Form Factor: Hoerner’s Wing-like correction

Additional drag-generating components can be defined in the Vehicle.ParasiteModel.components list.

Each additional component can specify its own friction coefficient and form factor correction with:

• component.cfType

• component.formFactorType

### Note: componentParasite requires the following variables to have already been appended to the state:

• Vehicle.State.Trajectory.V

• Vehicle.State.Atmosphere.rho

• Vehicle.State.Atmosphere.mu

### Note: ParasiteDrag model does NOT return CD0. It is appended to the state for later use.

Parameters:

Vehicle (Vehicle) – Vehicle from which the drag is being called for. Automatically passed when a call to the Wrapper is made.

DSAeroToolsSim.Models.Parasite.constantParasite module

Constant Parasite Drag Model

DSAeroToolsSim

REQUIRED INPUT STRUCTURE
Vehicle.ParasiteModel.CD0

DSAeroToolsSim.Models.Parasite.constantParasite.JSONify(Vehicle)

JSONification of ParasiteModel

Called by Vehicle’s JSONify method. This function creates a JSON-compatible dictionary of the ParasiteModel attributes.

The function does not return the dictionary, but rather stores it in the Vehicle’s ParasiteModel.JSON attribute.

Parameters:

Vehicle (Vehicle) – Vehicle whose ParasiteModel is being JSONified

DSAeroToolsSim.Models.Parasite.constantParasite.constantParasite(Vehicle, *args)

Constant Parasite Drag Model

Appends ‘CD0’ to Vehicle.State.Aero.CD0.

Simplest model: constant CD0.

Parameters:

Vehicle (Vehicle) – Vehicle from which the drag is being called for. Automatically passed when a call to the Wrapper is made.