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Kutta, published by Cesar Gimenes and currently available in version 0.1.11, is a qualitative 2D wind tunnel simulation tool combined with an airfoil editor. The software is distributed in a single version, and it falls within the educational and scientific visualization category, specifically addressing aerodynamics and fluid flow simulation. Its primary purpose is to let users visualize how a two-dimensional flow behaves around an airfoil: the application streams the flow past the profile and renders the speed field, vorticity, and smoke streaklines, alongside lift and drag vectors. All of these visual elements update in real time as the user changes the angle of attack, making it possible to observe how flow patterns, circulation, and aerodynamic forces evolve with the orientation of the wing. A defining component of kutta is its integrated shape editor, which allows users to draw custom airfoil profiles rather than being restricted to predefined geometries. The editor also supports more advanced configurations: a wing can be split into a main wing plus a flap, and control surfaces can be animated using keyframes, enabling exploration of how flap deflections influence the surrounding flow. This makes the software suitable for interactive experimentation with basic airfoil design concepts and control surface behavior. Typical use cases include teaching and learning aerodynamics, demonstrating flow phenomena such as vorticity and streamline behavior, and conducting informal, exploratory experiments with wing shapes and angles of attack. Importantly, kutta is explicitly qualitative and educational in nature: it is designed to capture the shape and character of the flow rather than to produce calibrated numerical results. Users seeking precise quantitative lift and drag data or engineering-grade computations should therefore treat its output as an illustrative approximation rather than validated measurement.
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