Fluid Dynamic Computations with NaSt2D2.0 
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Would you know, how looks the turbulent flow around a cabriolet at 100 km/h? On the left you see the streamlines with colorcoded pressure distribution as background or with the velocity vectors with colorcoded vorticity distribution as background or with as GIFanimation the moved velocity vectors with colorcoded vorticity distribution as background. Calculated are the pictures with NaSt2D2.0 and the standard kε turbulence model. 
The program package NaSt2D2.0 solves with the SORmethod (successive overrelaxation) the NavierStokes equations, discreted by finite difference method, in a staggered rectangle grid for given boundary conditions. Viskous, unsteady, incompressible, laminar and turbulent flows you can numerically simulate. The lowReynold number model and the standard kε model are implemented as turbulence models.
The program package contains the source files in the programming language C, a detailed instruction manual as HTMLfile, the input samples for the numerous implemented problems, and as C resp. FORTRANfiles the preprocessing programs for visualization of computation results with the graphic programs GNUPLOT and DISLIN. It is here available free of charge:
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The source files of NaSt2D2.0 are clearly arranged structured, and thus very good applicable for work out the difficulty of fluiddynamic computations, from flows around solid bodies, over flows through complicated geometries, up to computations of free boundary value problems and flows with energy transport.
The basic version NaSt2D is from Institute for Numerical Simulation of the University Bonn available free of charge here. NaSt2D2.0 is an extension particularly for computation of turbulent flows. It can download on "click" free of charge; and here online to the program package a detailed instruction manual.
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© 12.06.2018 Klaus Bauerfeind all rights reserved last changed on May 6, 2018 with the extensions : ✱ exemplary representation of all implemented problems in a "compilation" ✱ computation of the Kármán vortex street behind a "flying gyrocopter". 