totalCoefficients Element

Formulas for modification of aerodynamic data.

Namespace: Empty

Schema: Empty

Type
Parents
Children
NameOccurrencesDescription
All All
      Element cfxFormula[0, 1]

Formula for the force coefficient in x direction

      Element cfyFormula[0, 1]

Formula for the force coefficient in y direction

      Element cfzFormula[0, 1]

Formula for the force coefficient in z direction

      Element cmxFormula[0, 1]

Formula for the moment coefficient around the x axis

      Element cmyFormula[0, 1]

Formula for the moment coefficient around the y axis

      Element cmzFormula[0, 1]

Formula for the moment coefficient around the z axis

      Element controlSurfaces[0, 1]

List of control surfaces

      Element dampingDerivatives[0, 1]

Formulas for damping derivatives for positive and negative rotation rates

Attributes
NameTypeRequiredDescription
Attribute externalDataDirectorySimple Type string
Attribute externalDataNodePathSimple Type string
Attribute externalFileNameSimple Type string
Remarks

0. General overview

This node contains the formulas for modification of the aerodynamic coefficients. They are formulated in the way: coefficient = [coefficientFormula], e.g.: <cfzFormula>="cfz + 0.1" means "cfz = cfz + 0.1". The formulas are either modifying the total results of discrete loadcases, or they are modifying the whole performance map for that coefficient. Available formula operators are (from low to high priority):

OperatorExplanation
+Addition
-Subtraction
*Multiplication
/Division
^Raise to power
SQRT()Square root
ARCSIN()Arc sine
SIN()Sine
ARCCOS()Arc cosine
COS()Cosine
ARCTAN()Arc tangent
TAN()Tangent
EXP()Exponential function (base-e)
LN()Natural logarithm (base-e)
LOG()Common logarithm (base-10)
()Brackets (can be nested to a nearly unlimited depth)
The formula parser is working case-insensitive and ignores whitespaces. Numbers can be written in decimal or exponential form (examples (separated by semicolons): 5 3. 7.3 5.7e2), using "." as decimal character. The following parameters can be used:
ParameterExplanation
MAMach number
REReynolds number
AOYAngle of yaw
AOAAngle of attack
CFXForce coefficient in x direction
CFYForce coefficient in y direction
CFZForce coefficient in z direction
CMXMoment coefficient around the x axis
CMYMoment coefficient around the y axis
CMZMoment coefficient around the z axis
PIPI constant
The coefficient formulas are evaluated in such order, that the coefficients, which are used as parameters, are recalculated first. If, e.g., <cfxFormula> would be "CFZ^2/(PI*10)", then <cfzFormula> would be evaluated first.

1. <cfxFormula> (optional)

Formula for modification of force coefficients in x direction

2. <cfyFormula> (optional)

Formula for modification of force coefficients in y direction

3. <cfzFormula> (optional)

Formula for modification of force coefficients in z direction

4. <cmxFormula> (optional)

Formula for modification of moment coefficients around the x axis

5. <cmyFormula> (optional)

Formula for modification of moment coefficients around the y axis

6. <cmzFormula> (optional)

Formula for modification of moment coefficients around the z axis

7. <dampingDerivatives> (optional)

Formula for modification of the damping derivatives. This node can only be used in case of performance map computations.

8. <controlSurfaces> (optional)

Formula for modification of the control surface performance maps. This node can only be used in case of performance map computations.

See Also