A general implementation of an EARSM in OpenFOAM 2.3.1
OpenFOAM 2.3.1 can be downloaded here: https://sourceforge.net/projects/openfoam/files/2.3.1/OpenFOAM-2.3.1.tgz/download
Follow the steps given in the wiki for installation of OpenFOAM 2.3.1 under, e.g., UBUNTU 18.04: https://openfoamwiki.net/index.php/Installation/Linux/OpenFOAM-2.3.1/Ubuntu#Ubuntu_18.04
The OpenFOAM code can be installed via
cd src_turbulenceModels
wmake