Tidal energy has significant potential yet to be developed. One of the key areas of the research lines being developed is the ability to perform accurate computational models in order to make a full appraisal of kinetic energy potential in different areas through tide movements. So far, due to the limitations of computational resources and the extension of the geographical domains, existing models have manly used simplifications such as low resolution mesh sizes and velocity profile approximations in the vertical dimension. The investigation put forward includes a high resolution two dimensional equivalent model of the zone studied using a longitudinal section with depth and length dimensions, as well as a simulation methodology to study the velocity field in different sections. The model can be used in cases of channels of high width compared to the depth. With such data, kinetic power and energy of tidal currents can be predicted. Both, model and methodology have been applied and validated to the specific case of the estuary of Avilés port, thereby obtaining a new perspective in the hydrodynamic study as well as a tidal current energy potential assessment.