PAERO2
Bulk Data Entry Defines the cross-sectional properties of slender bodies. This is used for Vortex Lattice Method (VLM) and Doublet Lattice Method (DLM) in subsonic aeroelastic analysis.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
PAERO2 | PID | ORIENT | WIDTH | AR | LRSB | LRIB | LTH1 | LTH2 | |
THI1 | THN1 | THI2 | THN2 | THI3 | THN3 |
Example
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
PAERO2 | 3 | ZY | 2.5 | 1.0 | 300 | 200 | |||
1 | 10 |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
PID | Property identification number. This is to be referenced by a
CAERO2 Bulk Data Entry. No default (Integer > 0) |
|
ORIENT | Orientation flag. Type of motion allowed for bodies defined
in the aerodynamic coordinate system of
ACSID. See AERO
Bulk Data Entry. No default (Character = “Z”, “Y”, or “ZY”) |
|
WIDTH | Reference the half-width of body and the half-width of the
constant width interference tube. No default (Real > 0.0) |
|
AR | Aspect ratio of the interference tube which is calculated as
the height of the tube divided by the width. No default (Real > 0.0) |
|
LRSB | Identification number of an AEFACT entry
containing a list of slender body half-widths at the end points
of the slender body elements.
|
|
LRIB | Identification number of an AEFACT entry
containing a list of interference body half-widths at the end
points of the interference elements.
|
|
LTH1 | Identification number of AEFACT entries
for defining θ1 arrays for interference calculations.
Default = blank (Integer ≥ 0) |
|
LTH2 | Identification number of AEFACT entries
for defining θ2 arrays for interference calculations.
Default = blank (Integer ≥ 0) |
|
THIi, THNi | The first and last interference element of a body to use the
θ1 array; the others use the θ2 array.
No default for THI1 and THN1 (Integer > 0) Default = blank for THI2/3 and THN2/3 (Integer ≥ 0) |
Comments
- The half-widths (given on AEFACT entries referenced in fields 6 and 7) are specified at division points. The number of entries on an AEFACT entry used to specify half-widths must be one greater than the number of elements.
- THIi and THNi are interference element numbers on a body. The first element is one for each body. If THI1~3 and THN1~3 are all defined, the union of [THI1, THN1], [THI2, THN2] and [THI3, THN3] defines the complete set of interference elements using the θ1 array.
- A body is represented by a slender body surrounded by an interference tube. The slender body creates the downwash due to the motion of the body, while the interference tube represents the effects upon panels and other bodies.
- The angles θ1 and θ2 are input in degrees using the aerodynamic element coordinate system as the reference coordinate system for defining the theta points.
- Distribution of the theta points does not need to be uniform. A theta point must be placed a finite distance (instead of zero distance) from any aerodynamic box edge; preferably the box edge is equidistant from any two theta points located on the two sides of that box.
- For half models, the theta arrays LTH1 and LTH2 should encompass a full 360-degree range.