/FVMBAG/MODIF
Engine Keyword Activates FVM airbag merging parameter modifications in Engine file.
Format
/FVMBAG/MODIF
monvol_ID
Igmerg Cgmerg Cnmerg Ilvout
Definition
Field | Contents | SI Unit Example |
---|---|---|
monvol_ID | Finite Volume Method
monitored volume identification number. (Integer) |
|
Igmerg | Global merging formulation
flag. 1
(Integer) |
|
Cgmerg | Factor for global merging.
1 (Real) |
|
Cnmerg | Factor for neighborhood
merging. 1 (Real) |
|
Ilvout | Output level:
(Integer) |
Comments
- When a finite
volume fails during the inflation process of the airbag (volume becoming negative,
internal mass or energy becoming negative), it is merged to one of its neighbors so
that the calculation can continue. Two merging approaches are used:
- Global merging: a finite volume is merged if its volume becomes less than a certain factor multiplying the mean volume of all the finite volumes. The flag Igmerg determines if the mean volume uses the current mean volume (Igmerg =1) or the initial mean volume (Igmerg =2). The factor giving the minimum volume from the mean volume is Cgmerg.
- Neighborhood merging: a finite volume is merged if its volume becomes less than a certain factor multiplying the mean volume of its neighbors. The factor giving the minimum volume from the mean volume is Cnmerg.
If both Cgmerg and Cnmerg are not equal to 0, merging approach will be used simultaneously.