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I'm a mechanical engineer and I work at Pontifical Catholic University of Rio de Janeiro/Brazil. I started to use OpenFOAM in my PhD thesis, in order to use commercial CFD softwares. My research is about non-Newtonian fluid displacement in annuli geometries. The displacement of non-Newtonian fluids is an important subject on oil and gas industry, such as cement and completions operations. The successful of cementing process guarantee the desired well life, since the lifetime of the well is strongly influenced by the cementing operation. The cementing process in an oil well is a crucial operation that needs to be very well performed. The aim of this work is increase the displacement efficiency optimizing the rheological fluids parameters, flow rate, density and viscosity ratios.