UBF2D: a pilot research code for the aerodynamic force analysis

Unsteady Break-Force 2D (UBF2D) is a pilot two-dimensional code developed by the Italian Aerospace Research Centre (C.I.R.A. SCpA) and the University of Naples Federico II, for the analysis and decomposition of the aerodynamic force on clean aerofoils. It is written in C++ (roughly 8300 code lines) and uses the public-domain TecIO library to manage input and output of structured datasets. The code is able to post-process a steady or unsteady 2D flow-field, where data are provided in dimensional form (International System of Units) at grid nodes of a structured C-mesh (organised in one or multiple blocks, clock-wise-oriented along the C-direction). UBF2D reads in solution input files, together with a case configuration file (containing asymptotic conditions, reference values, mesh movement specification, numerical settings, etc.). The accepted solution input format is given by Tecplot sub-zone (load-on-demand) binary files (one file for each solution time) containing at least primitive variables data and grid velocities. Indeed, either fixed or moving meshes are considered, where harmonic pitching and/or plunging oscillations may be prescribed. Similarly, the code is able to deal with either viscous or inviscid solutions, obtained from compressible or incompressible flow solvers.