HighLift Device
 @HIGH_LIFT_DEVICE_DEFINITION {
 @HIGH_LIFT_DEVICE_NAME {HlfdName} {
 @DIMENSIONS {
 @DIMENSION_01 {c}
 @DIMENSION_02 {η_{s}}
 @DIMENSION_03 {η_{1}}
 @DIMENSION_04 {η_{2}}
 @DIMENSION_05 {η_{e}}
 @DIMENSION_06 {t_{fT}}
 @DIMENSION_07 {t_{wO}}
 @DIMENSION_08 {t_{wI}}
 @DIMENSION_09 {h_{L}}
 @DIMENSION_10 {α_{L}}
 @DIMENSION_11 {h_{R}}
 @DIMENSION_12 {α_{R}}
 @DIMENSION_13 {α}
 @DIMENSION_14 {β}
 }
 @MATERIALS {
 @MATERIAL_01 {Mat_{1}}
 @MATERIAL_02 {Mat_{2}}
 @MATERIAL_02 {Mat_{3}}
 }
 @AIRFOIL_SHAPE_NAME {AirfName}
 @NUMBER_OF_CONTROL_POINTS {N_{cp}}
 @IS_DEFINED_IN_FRAME {FrameName}
 @MESH_DENSITY {m_{d}}
 @COMMENTS {CommentText}
 }
 }
Notes

The airfoil is based on the airfoil shape defined by AirfName. It is necessary to specify such shape thorugh an airfoil definition.

The base section is a closed box supporting a portion of an airfoil, as illustrated in figs. 1, 2, and 3. No options are available for this shape.

The definition of the geometry of the crosssection relies on the concept of NURBS curves. N_{cp} control points will be used for the definition of these NURBS curves. (Default: N_{cp} = 2,048)

Optional dimensions @DIMENSION_13 and @DIMENSION_14 define two shaping parameters, denoted α and β, respectively, which are used to round the corners of the section. (Default value: α = β = 0.5).

Sectional shapes are defined in their own local coordinate system, which is assumed to coincide with the global coordinate system. If a fixed frame, FrameName, is specified, the local coordinate system coincides with this fixed frame.

The mesh density parameter, m_{d}, determines the level of mesh refinement. (Default: m_{d} = 4)

It is possible to attach comments to the definition of the object; these comments have no effect on its definition.
The highlift device: base configuration

Fig.1 illustrates the base configuration of the highlift device.

The geometric configuration of the highlift device if defined by the dimensions listed in table 1, which are also indicated in figs. 1, 2, and 3. Dimensions labeled in red are required. Dimensions labeled in blue are optional and are assigned the default value indicated in table 1.
Component 
Dimension 
Symbol 
Default 
Nb. 
Airfoil 
chord length 
c 
required 
01 
Airfoil 
location 
η_{s} 
required 
02 
Airfoil 
location 
η_{1} 
required 
03 
Airfoil 
location 
η_{2} 
required 
04 
Airfoil 
location 
η_{e} 
required 
05 
Flange 
thickness 
t_{fT} 
required 
06 
Outer wrap 
thickness 
t_{wO} 
t_{fT} 
07 
Inner wrap 
thickness 
t_{wI} 
t_{fT} 
08 
Left web 
height 
h_{L} 
required 
09 
Left web 
skew angle 
α_{L} 
90° 
10 
Right web 
height 
h_{R} 
h_{L} 
11 
Right web 
skew angle 
α_{R} 
90 ° 
12 
Table 1. Dimensions defining the geometry of the highlift device.

Zone 1 of the highlift device is defined as follows.

It comprises the following faces: FlangeFrontTop, FlangeMiddleTop, FlangeRearTop, TrailingEdgeTop, FlangeFrontBottom, FlangeMiddleBottom, FlangeRearBottom, and TrailingEdgeBottom.

It is associated with material Mat_{1} , which can refer to material properties or solid properties.

Zone 2 of the highlift device is defined as follows.

It comprises the following faces: WrapTop, SideRearTop, SideRearBot, WrapBot, SideFrontBot, and SideFrontTop.

It is associated with material Mat_{2} , which can refer to material properties or solid properties.
Figure 1. The highlift device
Figure 2. The highlift device, left web detail
Figure 3. The highlift device, leading edge detail