/MONVOL/PRES

Block Format Keyword Describes the pressure load curve monitored volume type.

Format

Field	Contents	SI Unit Example
`monvol_ID`	Monitored volume identifier (Integer, maximum 10 digits)
`unit_ID`	Unit Identifier (Integer, maximum 10 digits)
`monvol_title`	Monitored volume title (Character, maximum 100 characters)
`surf_ID`_ex	External surface identifier. (Integer)
`Ascale`_t	Abscissa scale factor for time based functions. (Real)	$[s]$ $[s]$
`fct_ID`	Load curve identifier for relative pressure $P_{r e l} (\frac{V_{0}}{V})$ $P_{r e l} (\frac{V_{0}}{V})$ or $P_{r e l} (t)$ $P_{r e l} (t)$ depending on `Itypfun` input. (Integer)
`Fscale`	Load curve scale factor for relative pressure. Default = 1.0 (Real)	$[Pa]$ $[Pa]$
`Itypfun`	Argument of the relative pressure function flag. =0 Pressure depends on relative volume. = 1 Pressure depends on time. (Integer)

The relative pressure is defined as, Prel = pressure inside of monitored volume - atmospheric pressure.
surf_ID_ex must be defined using segments associated with 4- or 3-nodes shell elements (possibly void elements) and not with /SURF/SEG.
The volume must be closed and the normals must be oriented outwards.
Abscissa scale factors are used to transform abscissa units in airbag functions, for example:(1)
$F (t') = fct_{ID}_{t} = f (\frac{t}{{Ascale}_{t}})$ $F (t') = fct_{ID}_{t} = f (\frac{t}{{Ascale}_{t}})$

Where,

$t$ $t$

Time

(2)
$F (P') = f c t_I D_{P} = f (\frac{P_{r e l}}{A s c a l e_{P}})$ $F (P') = f c t_I D_{P} = f (\frac{P_{r e l}}{A s c a l e_{P}})$

Where,

$P_{r e l}$ $P_{r e l}$

Relative pressure