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quickfluid


Matlab package for the numerical simulation of 2D laminar, incompressible fluid flow.

quickfluid solves the unsteady Navier-Stokes equations in two dimension on (regular) Cartesian grids as a testbed for mathematical and physical methods in the context of flow simulation.
Based on the Chorin projection method, the time discretisation of the momentum equations is done by an explicit Euler method. The discretisation of the space is realised by bilinear elements for the velocities using constant pressure per cell as the corresponding Lagrangeian multiplier for the continuity constraint. In each time step, thus, a linear system of equations (the discrete pressure poisson equation) is solved whose solution is used to update the velocities for the next time step. For the calculation of force values (on obstacles, e.g.), the method of consistent forces is used.

Screenshot of the matlab-GUI quickvis.

Via the use of obstacle node lists, arbitrary geometries can be used in a rectangular domain. Built in scenarios are e.g. driven cavity, free channel flow, and cylinder channel benchmarks.

An extension to adaptive cartesian grids exists and is named quadfluid.

The program package comes with an easy to use visualisation GUI called quickvis.

A GNU GPL version of this matlab package is available by contacting T. Neckel
T. Neckel, 11.04. 2007