# fracture aperture command

Syntax

fracture aperture keyword ... <range>

Primary keywords:

Assign apertures to fractures. Apertures can be used during contact model assignment (with the fracture contact-model command), for connectivity distance calculations (with the fracture connectivity command) and with the DFN range element.

constant f

Constant aperture with f>0.

dfn s

Limit aperture assignment to the DFN with provided name.

fish s a1...an

Apertures are assigned via the user-defined FISH function s with arguments . This function is called for each fracture and must return a floating point value corresponding to the fracture aperture.

gauss fm fs

Draw apertures randomly from a Gaussian distribution with mean fm and standard deviation fs.

limits fmin fmax

Apertures fall within the range [fmin, fmax], where fmax is greater than or equal to fmin. By default, fmin = 0 and fmax = +∞.

log-normal fm fs

Draw apertures randomly from a log-normal distribution with mean fm and standard deviation fs.

power-law f

Draw apertures randomly from a negative power-law distribution with exponent f.

uniform

Draw apertures randomly from a uniform distribution within the given limits as defined by the limit keyword.

Usage Example

The following example illustrates how the fracture aperture command can be used to assign apertures drawn from a number of distributions.

model new
model random 10000
model domain extent -5 5
;Generate fractures using the default template
fracture generate fracture-count 1000
;Set the apertures
fracture aperture log-normal 0.1 10
program return