doc:user:general:locks
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Table of Contents
Fields at Nodes
Definition
Fields are codes used to refer to nodal values. These codes must be known to use Metafor, and are divided into two entities, a Nature and a Variant.
field = Field(Nature, Variant)
Here is a list of some Nature identifiers :
Nature | meaning |
|---|---|
TX | X-coordinate (default) |
TY | Y-coordinate |
TZ | Z-coordinate |
TO | temperature |
TM | time |
and the most basic Variant ones
Variant | meaning |
|---|---|
RE | relative (default) |
AB | absolute |
GF1 | force #1 |
GF2 | force #2 |
GF3 | force #3 |
GV | first order derivative – velocity |
GA | second order derivative – acceleration |
Examples:
The meaning of a given Field 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 |
Common Fields used in Metafor
| Field | Meaning in Metafor |
|---|---|
(TX,AB), (TY,AB), (TZ,AB) | initial positions ($x$, $y$ and $z$) |
(TX,RE), (TY,RE), (TZ,RE) | displacements ($x$, $y$ and $z$) |
(TO,AB) | initial temperature |
(TO,RE) | temperature variation |
(TX,GV), (TY,GV), (TZ,GV) | velocities ($v_x$, $v_z$ and $v_z$) |
(TX,GA), (TY,GA), (TZ,GA) | accelerations ($a_x$, $a_y$, $a_z$) |
(TM,RE) | time |
(TX,GF1), (TY,GF1), (TZ,GF1) | mechanical external forces / contact forces |
(TX,GF2), (TY,GF2), (TZ,GF2) | mechanical internal forces |
(TX,GF3), (TY,GF3), (TZ,GF3) | inertia forces |
(TO,GF1) | thermal external forces |
(TO,GF2) | thermal external forces |
| … | … |
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