Parasite Drag Functions

This group of API functions is supplemental to performing a Paraste Drag analysis through the Analysis Manager. They include functions to write out Parasite Drag Tool equations, calculate atmospheric properties, and control excrescences. Click here to return to the main page. More...

Functions
void	vsp::AddExcrescence (const std::string &excresName, const int &excresType, const double &excresVal)
void	vsp::DeleteExcrescence (const int &index)
void	vsp::UpdateParasiteDrag ()
void	vsp::WriteAtmosphereCSVFile (const std::string &file_name, const int &atmos_type)
void	vsp::CalcAtmosphere (const double &alt, const double &delta_temp, const int &atmos_type, double &temp, double &pres, double &pres_ratio, double &rho_ratio)
void	vsp::WriteBodyFFCSVFile (const std::string &file_name)
void	vsp::WriteWingFFCSVFile (const std::string &file_name)
void	vsp::WriteCfEqnCSVFile (const std::string &file_name)
void	vsp::WritePartialCfMethodCSVFile (const std::string &file_name)

Detailed Description

Function Documentation

AddExcrescence()

void vsp::AddExcrescence	(	const std::string &	excresName,
		const int &	excresType,
		const double &	excresVal
	)

Add an Excresence to the Parasite Drag Tool

AddExcrescence( "Miscellaneous", EXCRESCENCE_COUNT, 8.5 );
 
AddExcrescence( "Cowl Boattail", EXCRESCENCE_CD, 0.0003 );

See also

EXCRES_TYPE

Parameters

[in]	excresName	Name of the Excressence
[in]	excresType	Excressence type enum (i.e. EXCRESCENCE_PERCENT_GEOM)
[in]	excresVal	Excressence value

CalcAtmosphere()

void vsp::CalcAtmosphere	(	const double &	alt,
		const double &	delta_temp,
		const int &	atmos_type,
		double &	temp,
		double &	pres,
		double &	pres_ratio,
		double &	rho_ratio
	)

Calculate the atmospheric properties determined by a specified model at input altitude and temperature deviation. This function may not be used for any manual atmospheric model types (i.e. ATMOS_TYPE_MANUAL_P_T). This function assumes freestream units are metric, temperature units are Kelvin, and pressure units are kPA.

double temp, pres, pres_ratio, rho_ratio;
 
double alt = 4000;
 
double delta_temp = 0;
 
CalcAtmosphere( alt, delta_temp, ATMOS_TYPE_US_STANDARD_1976, temp, pres, pres_ratio, rho_ratio );

See also

ATMOS_TYPE

Parameters

[in]	alt	Altitude
[in]	delta_temp	Deviation in temperature from the value specified in the atmospheric model
[in]	atmos_type	Atmospheric model enum (i.e. ATMOS_TYPE_HERRINGTON_1966)
[out]	temp	output Temperature
[out]	pres	output Pressure
[out]	pres_ratio	Output pressure ratio
[out]	rho_ratio	Output density ratio

DeleteExcrescence()

void vsp::DeleteExcrescence

(

const int &

index

)

Delete an Excresence from the Parasite Drag Tool

AddExcrescence( "Miscellaneous", EXCRESCENCE_COUNT, 8.5 );
 
AddExcrescence( "Cowl Boattail", EXCRESCENCE_CD, 0.0003 );
 
AddExcrescence( "Percentage Example", EXCRESCENCE_PERCENT_GEOM, 5 );
 
DeleteExcrescence( 2 ); // Last Index

Parameters

[in]

index

int Index of the Excressence to delete

UpdateParasiteDrag()

void vsp::UpdateParasiteDrag

(

)

Update any reference geometry, atmospheric properties, excressences, etc. in the Parasite Drag Tool

WriteAtmosphereCSVFile()

void vsp::WriteAtmosphereCSVFile	(	const std::string &	file_name,
		const int &	atmos_type
	)

Calculate the atmospheric properties determined by a specified model for a preset array of altitudes ranging from 0 to 90000 m and write the results to a CSV output file

Print( "Starting USAF Atmosphere 1966 Table Creation. \n" );
 
WriteAtmosphereCSVFile( "USAFAtmosphere1966Data.csv", ATMOS_TYPE_HERRINGTON_1966 );

See also

ATMOS_TYPE

Parameters

[in]	file_name	Output CSV file
[in]	atmos_type	Atmospheric model enum (i.e. ATMOS_TYPE_HERRINGTON_1966)

WriteBodyFFCSVFile()

void vsp::WriteBodyFFCSVFile

(

const std::string &

file_name

)

Calculate the form factor from each body FF equation (i.e. Hoerner Streamlined Body) and write the results to a CSV output file

Print( "Starting Body Form Factor Data Creation. \n" );
WriteBodyFFCSVFile( "BodyFormFactorData.csv" );

Parameters

[in]

file_name

Output CSV file

WriteCfEqnCSVFile()

void vsp::WriteCfEqnCSVFile

(

const std::string &

file_name

)

Calculate the coefficient of friction from each Cf equation (i.e. Power Law Blasius) and write the results to a CSV output file

Print( "Starting Turbulent Friciton Coefficient Data Creation. \n" );
WriteCfEqnCSVFile( "FrictionCoefficientData.csv" );

Parameters

[in]

file_name

Output CSV file

WritePartialCfMethodCSVFile()

void vsp::WritePartialCfMethodCSVFile

(

const std::string &

file_name

)

Calculate the partial coefficient of friction and write the results to a CSV output file

Print( "Starting Partial Friction Method Data Creation. \n" );
WritePartialCfMethodCSVFile( "PartialFrictionMethodData.csv" );

Parameters

[in]

file_name

Output CSV file

WriteWingFFCSVFile()

void vsp::WriteWingFFCSVFile

(

const std::string &

file_name

)

Calculate the form factor from each wing FF equation (i.e. Schemensky 4 Series Airfoil) and write the results to a CSV output file

Print( "Starting Wing Form Factor Data Creation. \n" );
WriteWingFFCSVFile( "WingFormFactorData.csv" );

Parameters

[in]

file_name

Output CSV file