I'm wondering: If I wanted to illustrate the 2D/3D air-flow and turbulence around simple solid objects which I define myself, would that be possible in Matlab? Cheers Jakob
The FEATool Multiphysics and Matlab CFD Toolbox allows you to perform fluid flow and other physics simulations directly in a GUI environment. In addition to using the built-in GUI you can also use all toolbox functions directly on the command line, so in your case you could use featool m-functions for just geometry and grid generation, or 3D visualization and postprocessing as in the linked post.
The tutorial videos on the linked page show how to set up and solve a flow over a backwards facing step simulation directly in Matlab with the external OpenFOAM CFD solver.
Yes, MATLAB can be used to visualize data for turbulent flows. One of the examples would be the MATLAB code available on the Johns Hopkins Turbulence database website: Using the JHU Turbulence Database Matlab Analysis Tools. This GUI based implementation "provides functionality for plotting/animating velocity and vorticity fields, computing and plotting longitudinal energy spectra, and computing PDF's of velocity, pressure, and velocity increments". Here is one of the snapshots I could produce at my end.
Here, the data is fetched from the JHU Turbulence Database Cluster. You can write a similar code to visualize your own data.
You can also use QuickerSim CFD Toolbox for analysis of general 2-D flows. Full 3-D and turbulence comes soon.
Here are the links for download and documentation: http://www.mathworks.com/matlabcentral/fileexchange/53993-quickersim-cfd-toolbox