Flow pipe model for fluid circulation

The report will contain a description of the different available tools for well modeling and results for different well configurations using water as pipe-fluid. The available models for the heat flow towards geothermal well from Task 2.1 will be integrated in models for the heat and fluid flow in the annulus and the central pipe. We will see how a model for heat flow towards a geothermal well can be coupled with advanced state-of-the-art models for pipe flow, either commercial software (i.e., OLGA Dynamic Multiphase Flow Simulator) or in-house tools. Using CFD advanced models for the pipe flow, we will predict the flow regime in the pipes, in case of multiphase flows, and test the heat transfer coefficients that control the heat flow from the well-wall interface to the fluid. We will add details to the numerical grids for better resolution of the heat flow between the inner tube and the annulus and the structure of the near well area.