Transform

Transform

 

Description

 

Here the keyword *TRANSFORM and its corresponding parameters are described. This is used to define local coordinate systems which can for example facilitate definition of boundary conditions (e.g. normal displacement to a tilted surface).

 

 

TRANSFORM    Transform coordinate system

Usage

*TRANSFORM,  NSET=Node_set_Name,  TYPE=Coordinate_system_type (NOT IMPLEMENTED)

Description

Defines a local coordinate system for the assigned node set. This data structure will be used to create ParaGeo Coordinate_system and Transformed_freedoms data structures. Following the keyword *TRANSFORM and all its corresponding parameters the direction cosines of the new coordinate system should be defined in a comma separated value as shown below.

 

•Direction cosines in 2D:

dx/dX,

dy/dX

dx/dY,

dy/dY

 

Coordinates_DirectionCosines2D

 

•Direction cosines in 3D:

dx/dX,

dy/dX,

dz/dX

dx/dY,

dy/dY,

dz/dY

dx/dZ,

dy/dZ,

dz/dZ

 

 

Compulsory Parameters

NSET

Specifies the NSET to which the coordinate system will be assigned

TYPE

Defines the type of coordinate system. Valid types are:

- GLOBAL : Orientation is defined relative to the global system (default)

- BEDDING : Orientation is defined relative to the approximate bedding plane system

 

 

Examples

 

*TRANSFORM, NSET=East, TYPE=GLOBAL

 0.999200959,  -0.039968038

 0.039968038,   0.999200959

 

1A rotation on the local coordinate system for East geometry set will be performed according to the specified direction cosines.