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OpenFOAM tutorial: Wind around buildings (domain, mesh, solver, solution)

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Hi! In this post I will explain to you a nice tutorial aviable on every openFOAM version (link), called windAroundBuildings. I will separete this post in many section dedicate to each step of a CFD case set up, so feel free of jup in to any part of you interest. The most important parts are how to incorporate the buildings and the mesh refinement around them. OpenFOAM tutorial - windAroundBuildings Brief explanation of the case This tutorial simulate the atmospheric wind flow arround a group of buildings, wich could be part of a city. The objetive is to see the presure (loads) on each face of the buildings and the wind circulation for an especific wind direction and intensity. Domain Domain - OpenFOAM tutorial - windAroundBuildings We have a group of buildings, max ...m high, that ocupy an area of ... x ... . The total domain has a bigger size, with a total doimension of 350m in x, 280m in y and 140m in z.   Border conditions There is a inlet face, with a c