OpenFOAM is written for the UNIX and GNU/Linux operating systems. While running OpenFOAM on the Windows operating system has historically been challenging, an increasing number of options are available, particularly with more recent versions of Windows.
Option 1: Running OpenFOAM on Windows 10
The packaged distributions of OpenFOAM for Ubuntu 18.04LTS can be installed directly on Microsoft Windows 10 using Bash on Ubuntu on Windows, a full compatibility layer for running Linux applications on Windows through the Windows Subsystem for Linux (WSL). Additional X server software is needed to run graphical applications, such as the version of ParaView that includes the official OpenFOAM reader module.
blueCFD-Core is free, open source software provided by blueCAPE Lda. It provides source code and builds of OpenFOAM for updated Windows 64 bit OS, versions 7 to 10. The builds use a component of MinGW known as MSys2.