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The GF Library includes three coordinate systems: rectangular, cylindrical,
and spherical. The numbering system has letters to denote coordinates in
each coordinate system, and one letter is needed to indicate each coordinate
present. Thus, a one-dimensional body designation contains one letter; a 2-D
body designation contains two letters, and, a 3-D body designation contains
three letters.

**Rectangular coordinate system **(*x*, *y*, *z*).
Symbol *X* is used to
denote the *x*-coordinate, *Y* denotes the *y*-coordinate, and *Z* denotes
the *z*-coordinate. Example: a 1-D plate with type 2 boundaries is
designated *X*22.

**Cylindrical coordinate system**
(*r*,, *x*).
Symbol *R* is used to
denote the *r*-coordinate, symbol
denotes angle
(
0 <
< 2), and symbol *X* denotes the axial *x*-coordinate. Example: 1-D
radial heat transfer in a hollow cylindrical shell with both surfaces
convectively heated is designated *R*33.

**Spherical (polar) coordinate system**
(*r*,,).
Symbol *RS* is used to denote the spherical *r*-coordinate, symbol
denotes
azimuthal angle
(
0 <
< 2), and symbol
denotes the
polar angle
(
0 <
< ). Example: 1-D radial heat
transfer in a hollow sphere with type 1 boundary conditions is designated *RS*11.

** Next:** Boundary Condition Designation.
** Up:** GF Numbering System.
** Previous:** GF Numbering System.
*Kevin D. Cole*

*2003-07-21*