/BEGIN

Description

This option is required.

Work unit system and Input unit system are used instead of unit system defined previously in: /UNIT/name for input format prior to v10.0.

Format

Definitions

Prefix and Associated Multiplying Factor

Prefix

Multiplying Factor

y

1.E-24

z

1.E-21

a

1.E-18

f

1.E-15

p

1.E-12

n

1.E-09

$\mu$ or mu

1.E-06

m

1.E-03

c

1.E-02

d

1.E-01

1

da

1.E+01

h

1.E+02

k

1.E+03

M

1.E+06

G

1.E+09

T

1.E+12

P

1.E+15

E

1.E+18

Z

1.E+21

Y

1.E+24

Comments

1. To be taken into account, this option must be written after the mandatory keyword # Radioss Starter.
2. The Runname is defined by the first non-blank character. It may have a maximum of 80 characters and a minimum of four characters. The characters "/" and "\" are not allowed.
3. The Input unit system defines the unit of the input deck. The work unit system defines which unit has been used during the computation. If the Input unit system is not equal to work unit system, Radioss will convert the input unit system (in Starter file, not in Engine file) to work unit system automatically.
4. The Work unit system defines the unit in which the calculation is done. The output is defined in the work unit system.
5. In submodels, Work unit system defined in /BEGIN of a submodel is ignored: the Work unit system defined in the main /BEGIN card is used.
6. If an Input unit system is not defined, Input unit system is equal to work unit system.
7. A code defining a unit is composed of a prefix giving the multiplying factor and a suffix giving the corresponding SI unit (kg for mass, m for length, and s for time):

   Code (Mass) Value yg 1.E-27 zg 1.E-24 ag 1.E-21 fg 1.E-18 pg 1.E-15 ng 1.E-12 $\mu g$ or mug 1.E-09 mg 1.E-06 cg 1.E-05 dg 1.E-04 g 1.E-03 dag 1.E-02 hg 1.E-01 kg 1 Mg 1.E+03 Gg 1.E+06 Tg 1.E+09 Pg 1.E+12 Eg 1.E+15 Zg 1.E+18 Yg 1.E+21

   Code (Length) Value ym 1.E-24 zm 1.E-21 am 1.E-18 fm 1.E-15 pm 1.E-12 nm 1.E-09 $\mu m$ or mum 1.E-06 mm 1.E-03 cm 1.E-02 dm 1.E-01 m 1 dam 1.E+01 hm 1.E+02 km 1.E+03 Mm 1.E+06 Gm 1.E+09 Tm 1.E+12 Pm 1.E+15 Em 1.E+18 Zm 1.E+21 Ym 1.E+24

   Code (Time) Value ys 1.E-24 zs 1.E-21 as 1.E-18 fs 1.E-15 ps 1.E-12 ns 1.E-09 $\mu s$ or mus 1.E-06 ms 1.E-03 cs 1.E-02 ds 1.E-01 s 1 das 1.E+01 hs 1.E+02 ks 1.E+03 Ms 1.E+06 Gs 1.E+09 Ts 1.E+12 Ps 1.E+15 Es 1.E+18 Zs 1.E+21 Ys 1.E+24

8. Radioss does not have a built-in unit system, so it is very important to keep unit consistency in your model.
9. As an alternative to the unit code, it is possible to input its value instead.