Nodal fields (such as the displacement, the velocity, the temperature, etc.) are defined thanks to a combination of two “codes”: a Nature and a Variant.
field = Field1D(Nature, Variant)
Here is a list of some Nature identifiers :
Nature | meaning |
|---|---|
TX | X-coordinate |
TY | Y-coordinate |
TZ | Z-coordinate |
TO | temperature |
TM | time |
and the most basic Variant ones
Variant | meaning |
|---|---|
RE | relative |
AB | absolute |
GF1 | force #1 - External Forces (reaction & contact) |
GF2 | force #2 - Internal Forces |
GF3 | force #3 - Inertial Forces |
GV | first order derivative – velocity |
GA | second order derivative – acceleration |
Examples:
The meaning of a given Field1D is deduced from the previous tables by combining the two components:
Field | meaning |
|---|---|
Field1D(TX,RE) | “X-coordinate”, “relative” = displacement along X |
Field1D(TX,AB) | “X-coordinate”, “absolute” = initial position along X |
Field1D(TX,GF1) | “X-coordinate”, “force #1” = external load along X |
Field1D(TY,GA) | “Y-coordinate”, “acceleration” = acceleration along Y |
| Field1D | Meaning in Metafor |
|---|---|
Field1D(TX,AB), Field1D(TY,AB), Field1D(TZ,AB) | initial positions ($x$, $y$ and $z$) |
Field1D(TX,RE), Field1D(TY,RE), Field1D(TZ,RE) | displacements ($x$, $y$ and $z$) |
Field1D(TO,AB) | initial temperature |
Field1D(TO,RE) | temperature variation |
Field1D(TX,GV), Field1D(TY,GV), Field1D(TZ,GV) | velocities ($v_x$, $v_z$ and $v_z$) |
Field1D(TX,GA), Field1D(TY,GA), Field1D(TZ,GA) | accelerations ($a_x$, $a_y$, $a_z$) |
Field1D(TM,RE) | time |
Field1D(TX,GF1), Field1D(TY,GF1), Field1D(TZ,GF1) | mechanical external forces / contact forces |
Field1D(TX,GF2), Field1D(TY,GF2), Field1D(TZ,GF2) | mechanical internal forces |
Field1D(TX,GF3), Field1D(TY,GF3), Field1D(TZ,GF3) | inertia forces |
Field1D(TO,GF1) | thermal external forces |
Field1D(TO,GF2) | thermal external forces |
| … | … |