New approaches in computational dynamics of the mixing flow

Between the most mature interdisciplinary areas, computational fluid dynamics (CFD) comes recently into focus. In the same time, it becomes more and more difficult to contribute fundamental research to it. However, although it remains unpredictable how CFD develops, it is part of what makes it an exciting and attractive discipline. This paper aims to exhibit some part of recent work in CFD. It concerns the qualitative approach of the turbulent behaviour of a mixing flow in an excitable media. Studying a mixing for a flow implies the analysis of successive stretching and folding phenomena for its particles, the influence of parameters and initial conditions. In the previous works, the study of the 3D non‐periodic models exhibited a quite complicated behaviour. In agreement with experiments, there were involved some significant events, the so‐called ‘rare events’. The variation of parameters had a great influence on the length and surface deformations. The experiments were realized with a special vortex installation, it was used a well‐known aquatic algae as biologic material, and the water as basic fluid. In the paper there are presented some features of a qualitative comparative analysis of the model associated to the vortex flow technology. In the computational analysis there were used the fast analysis tools of MAPLE11 soft, in order to check the ‘rare events’ and to complete the statistical analysis of the behaviour of the model.