Three Fluid Solvers, compared.  Visualization Description 


Simple stream line tracking particle, I used some my own improvements here to get better view of particle movements. 

U horizontal velocity component (absolute value of U), darker means slower in U direction here 

V velocity component (absolute value of U), darker means slower in U direction here. 

both U and V velocity sketch, where absolute value of U is placed as RED component of RGB colour pixel, and V is placed as GREEN velocity component 
There you can download Animations of fluid flow trough
different geometries. These two examples have been done for my friend
Jakub Kominiarczuk. Firs example animation is a fluid flow trough 0 degree frisbee with Re=400. Second example is also a frisbee but it was made with Re=10000 and for freesbee angle 45 degree. If you are interested, I can do for you animations of geometries which you are interested in. Just drop me an Email. If I will have some time, I will do it for you. 
SIMPLE, SIMPLER, Vorticity  Stream Fluid Solvers 

Some time ago I took a course TMM53 Computational Fluid Mechanics. It was taken during my exchange studies in Sweden (Linkopings University). During the course I haven't been on any lecture (because lectures were provided in Swedish) but I made three projects, and the final one I am presenting on that web page. My task was to implement one (or two) of NavierStokes solution methods. I will not describe it very carefully there, because they are described in my paper which is listed below. I had to implement three different solution methods: 1. SIMPLE  Semi Implicit Method for Pressure Linked Equations 2. SIMPLER  Semi Implicit Method for Pressure Linked Equations Revised 3. VorticityStream Functions approach for 2D NS equations There I will show some results from three solvers. Three of them gives me the same result (ohh! maybe it is good test case of my solvers?) so there is no different between the results. First of all let us consider Driven Cavity problem for Reynolds Number Re=400: I have got good quality pictures with well known vortices in the corners: Re=400, Classical Driven Cavity problem, Ratio 1:1 Re=400, Classical DrivenCavity Problem, Ratio 1:2 Flow over rectangular obstacle,
Re=100, SIMPLE Method (Only in SIMPLE Solver Boundary conditions have
been implemented).
Pictures have been generated with particle tracking method, and I add there some my ideas. . I also developed some other kinds of visualization, most of them you can find in my report which can be downloaded from main page or there: "Solution to twodimensional Incompressible NavierStokes Equations with SIMPLE, SIMPLER and VorticityStream Function Approaches. DrivenLid Cavity Problem: Solution and Visualization.", Maciej Matyka , University of Linkoping, CFD Project Report #3, 6.V.2003 (.ps.zip ~1.2 Mb) PDF (~300 kb) On that page you can also find some examples of animations which are made with SIMPLE solver. In that solver I have implemented boundary conditions which allow me to make for example some kind of wind tunnel, to see how air is going trough different geometries. 