WTBCREATE
WTBCREATE, IEL, NODE, DAMP
Creates a USER300 element to
model the turbine for full aeroelastic coupling analysis and specifies
relevant settings for the analysis.
IELElement number (next available number by default).
NODENode number connecting support structure and turbine.
DAMPDamping option for the turbine:
0
—
Damping matrix obtained from the aeroelastic code plus Rayleigh damping (default).
1
—
Rayleigh damping only.
2
—
Damping from the aeroelastic code only.
Notes
WTBCREATE invokes a predefined Mechanical APDL macro that automatically generates a turbine element and issue relevant data commands that are necessary to run a full aeroelastic coupling analysis. For detailed information on how to perform a fully coupled aeroelastic analysis, see Fully Coupled Wind Turbine Example in Mechanical APDL in the Programmer's Reference.
The generated USER300 turbine element will have 9 nodes with node numbers NODE, NMAX+1, NMAX+2, ..., NMAX+8, where NMAX is the maximum node number currently in the model.
There are six freedoms on the first node of the element: UX, UY, UZ, ROTX, ROTY, ROTZ, and these are true structural freedoms. For all the other nodes (that is, nodes 2 to 9), only the translational freedoms (UX, UY, UZ) are used. These are generalized freedoms that are internal to the turbine element and are used by the aeroelastic code only.
The element type integer of the USER300 element is the current maximum element type integer plus one.
The command will also set up the analysis settings appropriate for a full aeroelastic coupling analysis. These include full Newton-Raphson solution (NROPT,FULL) and a USRCAL command to activate the relevant user routines.