Abstract <p>This paper addresses the modeling of film cooling for high-temperature turbine blades. In cases when air is injected onto the outer surface of the blade, thermal calculation software based on empirical data does not take into account the airflow direction. This can be critical when cooling holes are oriented toward each other and counter-directed flows are formed in the midsection of the blade. To evaluate such a flow, it is necessary to solve the conjugate thermal-hydraulic (CTH) simulation in its full formation, which can be done using commercial packages such as Ansys CFX. This paper studies the influence of the grid and numerical model parameters on the turbine blade’s thermal state under the direct modeling of CTH simulation. The influence of grid parameters and solver settings is preliminarily investigated using a flat plate as an example. A comparison of the simulation and experimental data shows a strong dependence on the grid parameters and the absence of grid convergence. The calculated values approach the experimental ones only at a considerable distance from the cooling hole. Similar results are shown by the computational and experimental study of a vane (nozzle guide vane, NGV) with film cooling. The film on the vane surface strongly depends on the grid discretization and solver settings. Using the recommended grid and solver settings for the convective heat transfer problems leads to the presence of an excessively intense film along the entire vane, which contradicts the experimental data. The numerical modeling of film cooling on vanes therefore remains relevant.</p>