---
name: "upscale_elasticity"
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_elasticity"
---

# upscale\_elasticity(1)

Upscale elastic parameters

## NAME

upscale\_elasticity - Upscale elastic parameters

## SYNOPSIS

upscale\_elasticity \[grid file\] \[option=value\]

## DESCRIPTION

Utility that generalizes Backus upscaling to general geometry. Elastic moduli specified on a cell-basis on corner-point grids can be upscaled to an elasticity tensor with possibly 21 independent components. The code simulates the 6 load conditions (three normal and three shear forces applied to the geometry) necessary for determining the elastic properties.

Example usage:

upscale\_elasticity gridfilename=filename.grdecl rock\_list=rocklist.txt output=outfilename.txt

## OPTIONS

**gridfilename** Filename for grid file.\
 **vtufilename** Save results to vtu file for visual inspection. If not specified, vtu results are not saved.\
 **rock\_list** A file with a list of one file per satnum specifying elastic properties for each rock type.\
 **output** Filename for which results are written in ASCII format. If not specified, output is not written to file.\
 **method** The kind of boundary couplings to use, can be 'mpc' or 'mortar'. Defaults to 'mortar' (best for non-perfect periodic grids).\
 **Emin** Minimum E (youngs) modulus. Used to avid numerical issues if contrasts in grid is too large. Defaults to 0.\
 **ctol** Collapse tolerance in grid parsing. Defaults to 1e-6.\
 **ltol** Tolerance in iterative linear solvers. Defaults to 1e-8.\
 **linsolver\_type** Type of solver for linear system. Possibilities are 'iterative' and 'direct' (LU factorization). Default is 'iterative'.

## REPORTING BUGS

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