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January 5, 2025 at 2:13 pm
peteroznewman
Subscriber

Look at the Mechanical APDL command LOCAL on how to define a local coordinate system where you can define a Spherical coordinate system. In that coordinate system, the X axis is the radial direction.

LOCAL

LOCAL, KCN, KCS, XC, YC, ZC, THXY, THYZ, THZX, PAR1, PAR2
Defines a local coordinate system by a location and orientation.

KCN

Arbitrary reference number assigned to this coordinate system. Must be greater than 10. A coordinate system previously defined with this number will be redefined.

KCS

Coordinate system type:

0 or CART  

 — 

Cartesian

1 or CYLIN  

 — 

Cylindrical (circular or elliptical)

2 or SPHE  

 — 

Spherical (or spheroidal)

3 or TORO  

 — 

Toroidal

XC, YC, ZC

Location (in the global Cartesian coordinate system) of the origin of the new coordinate system.

THXY

First rotation about local Z (positive X toward Y).

THYZ

Second rotation about local X (positive Y toward Z).

THZX

Third rotation about local Y (positive Z toward X).