Space exploration and advanced astronomy have dramatically expanded our
knowledge of outer space and made it possible to study the indepth
mechanisms underlying various natural phenomena caused by complex
interaction of physical-chemical and dynamical processes in the
universe. Huge breakthroughs in astrophysics and the planetary s- ences
have led to increasingly complicated models of such media as giant
molecular clouds giving birth to stars, protoplanetary accretion disks
associated with the solar system's formation, planetary atmospheres and
circumplanetary space. The creation of these models was promoted by the
development of basic approaches in modern - chanics and physics
paralleled by the great advancement in the computer sciences. As a
result, numerous multidimensional non-stationary problems involving the
analysis of evolutionary processes can be investigated using wide-range
numerical experiments. Turbulence belongs to the most widespread and, at
the same time, the most complicated natural phenomena, related to the
origin and development of organized structures (- dies of different
scale) at a definite flow regime of fluids in essentially non-linear -
drodynamic systems. This is also one of the most complex and intriguing
sections of the mechanics of fluids. The direct numerical modeling of
turbulent flows encounters large mathematical difficulties, while the
development of a general turbulence theory is hardly possible because of
the complexity of interacting coherent structures. Three-dimensional
non-steady motions arise in such a system under loss of la- nar flow
stability defined by the critical value of the Reynolds number.
