## RANDOM_NUMBER_GENERATOR_SEED

#### Solution control and techniques

*RANDOM_NUMBER_GENERATOR_SEED
"Optional title"
seed

### Parameter definition

Variable
Description
seed
seed value
options:
0 $\rightarrow$ System clock used to set seed
ℤ+ $\rightarrow$ Any positive integer used to set seed
ℤ- $\rightarrow$ Any negative integer used to set seed

### Description

This command is used to set the seed for simulations where randomness is wanted. A random seed can be generated based on the system clock by setting seed to 0. Any positive/negative integer can also be used to set the seed. Setting it to 1 will give one specific result each consecutive simulation. Setting it to 2 will give a different, and so on.

### Example

###### Random initial damage on a surface

Randomly distributed initial damage is defined on the top surface of a plate consisting of $32 \times 32$ linear hexahedral elements. RANDOM_NUMBER_GENERATOR_SEED is used to generate a new random damage distribution each time the solver starts. By setting a value of 0 means that the seed is set according to the system clock.

*UNIT_SYSTEM SI *RANDOM_NUMBER_GENERATOR_SEED 0 # # --- MESH AND MATERIAL --- # *COMPONENT_BOX 1, 1, 32, 32, 1 0, 0, 0, 0.32, 0.32, 0.01 *MAT_METAL 1, 7800.0, 210.0e9, 0.3, 1 1 *FUNCTION 1 1.0e8 *PROP_DAMAGE_CL 1, 1 1.0e7 *PART 1, 1 # # --- INITIAL DAMAGE SURFACE RANDOM --- # *INITIAL_DAMAGE_SURFACE_RANDOM G, 1, 0.15, 4, 1.0, 0.01 *GEOMETRY_SEED_COORDINATE 1 0.16, 0.16, 0.01, , 1 *END