Well, the other day I saw a solution of a DNS (Direct Numeric Simulation) of a turbulent flow. My questions are a bit phylosophical, so that if I do not obtain some opinion in some day in this forum, it will be not a strange thing. -The turbulence is inherently three-dimensional and unsteady. A flow over a flat plate has to have a third dimension (the width of the plate). It seemed a mesh filled with a lot of very small eddies. So that, symmetry seems to be broken up. If there is no symmetry possible in spite of having a symmetric geometry and a symmetric initial condition, then you will see a different event depending on your angle of view. Don't you think it violates the common sense? In spite of having initial symmetry, the flow does not behave in a symmetric form. It is not usual to see this phenomena in other physics problems. -My principal question is about unsteadyness and the apparent alleatory behaviour. I'm going to quote the book "Computational Fluid Dynamics and Heat Transfer" of Anderson: The question is: if such certain random behaviour is real, Would I obtain two different solutions for the same problem? If I would solve the turbulent equations twice, would I obtain two distinct solutions each time?. Thanks for pay attention to this auto-quiz-puzzle.