Thermo-Hydro-Mechanical coupled modeling Modeling of heat exchange between fluids and structures is challenging to obtain adequate accuracy in both. The underlying constraint is that most of the numerical methods used, can optimally model either fluids or structures but not both simultaneously. In general the heat exchange coefficient through the boundary layer is calculated with the help of a computational fluid dynamics code, very often in Finite Volumes. This coefficient is then used by a Finite Element code to calculate the thermal conduction. The main problems in this practice are: * Thermal deformations in the structural surfaces, which are in contact with fluid, may modify the boundary layer and substantially change the heat exchange coefficient as well. Accurate calculation of the thermal exchange is the most important aspect as it influences the mechanical deformation. But, the changes in the boundary layer due to the same thermal deformation of the surfaces also modify it. * Any transient phenomenon is difficult to simulate accurately as the changes in boundary conditions and heat exchange coefficients require several information exchanges between the CFD code in Finite Volume and the structural mechanics code in Finite Element.