---
name: "upscale_relpermvisc"
section: "1"
platform: "linux"
package: "libopm-upscaling-bin"
version: "2024.10+ds-1+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/upscale_relpermvisc"
---

# upscale\_relpermvisc(1)

Upscale two-phase relative permeability

## NAME

upscale\_relpermvisc - Upscale two-phase relative permeability

## SYNOPSIS

upscale\_relpermvisc \[option=value\] \[grid file\] \[rock file 1\] \[rock file 2\] \[rock file 3\] ...

## DESCRIPTION

Upscale two-phase relative permeability in the capillary limit for lithofacies models described by Eclipse corner point grids.

Example usage:

upscale\_relpermvisc -bc p grid.grdecl swof1.inc swof2.inc

For isotropic input, the rock file has four columns, and looks like this:

\-- Stone 1 -- Sw           Krw             Kro     J-func\
   1\.42000E-01  0.00000E+00  1.00000E+00  2.25999E+00\
   2\.79250E-01  1.93652E-03  5.03619E-01  5.76122E-02\
   4\.14850E-01  1.09648E-02  2.36036E-01  -1.23421E-02\
   6\.14150E-01  4.10007E-02  3.95006E-02  -8.96693E-02\
   7\.26100E-01  1.41398E-01  9.30808E-03  -1.19849E-01\
   9\.48000E-01  8.40000E-01  0.00000E+00  -1.42553E+00

## OPTIONS

**-bc** Which boundary conditions to use. Possible values are p (periodic), f (fixed) or l (linear). Defaults to f.\
 **-points** Number of saturation points to upscale for, uniformly distributed. Defaults to 30.\
 **-waterViscosity** Viscosity of water given in Pascal seconds (1000 cP = 1 Pa s).\
 **-oilViscosity** Viscosity of oil given in Pascal seconds (1000 cP = 1 Pa s).\
 **-waterCurve** The column number in the rock files that represent relative permeability for water. Defaults to 2.\
 **-oilCurve** The column number in the rock files that represent relative permeability for oil. Defaults to 3.\
 **-outputWater** Filename for where to write upscaled values for water relperm. If not supplied, output will only go to the terminal (standard out).\
 **-outputOil** Filename for where to write upscaled values for oil relperm. If not supplied, output will only go to the terminal (standard out).\
 **-interpolate** If this option is used, the outputted values will be interpolated values using the supplied number of points (integer larger than 0). Monotone cubic interpolation is used, and will thus produce a smooth curve for a few number of saturation points.\
 **-minPerm** Minimum floating point value allowed for phase permeability in computations. If set to zero, some models can end up singular. Defaults to 1e-12.

## REPORTING BUGS

Report on github repository \<https://github.com/OPM/opm-upscaling/issues\>

## SEE ALSO

upscale\_relperm