IUTAM Symposium on Computational Physics and New by Peter Eberhard, Peter Eberhard

By Peter Eberhard, Peter Eberhard

This quantity comprises the complaints of the IUTAM Symposium on Computational Physics and New views in Turbulence, held at Nagoya college, Nagoya, Japan, in September 2006. top specialists in turbulence study have been introduced jointly at this Symposium to switch rules and speak about, within the gentle of the hot growth in computational equipment, new views in our knowing of turbulence. specific emphasis was once given to primary facets of the physics of turbulence. the topics mentioned right here disguise: computational physics and the idea of canonical turbulent flows; experimental techniques to primary difficulties in turbulence; turbulence modeling and numerical tools; and geophysical and astrophysical turbulence.This paintings may be important to graduate scholars and researchers attracted to primary elements of turbulence.

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Based on numerical simulations of shell models, we found that there exists a stable fixed point in which the scaling exponents corresponds to the non linear field for a particular choice of the parameter δ. e. independent of δ) and we provided some qualitative arguments to explain the observed universality. At this stage, no claim can be done concerning the relation between the universal fixed point and the scaling of the non linear field. The existence of such relation would imply the universality of the scaling properties of the nonlinear shell models and the Navier-Stokes equations.

Based on numerical simulations of shell models, we found that there exists a stable fixed point in which the scaling exponents corresponds to the non linear field for a particular choice of the parameter δ. e. independent of δ) and we provided some qualitative arguments to explain the observed universality. At this stage, no claim can be done concerning the relation between the universal fixed point and the scaling of the non linear field. The existence of such relation would imply the universality of the scaling properties of the nonlinear shell models and the Navier-Stokes equations.

These results provide a clear answer to the question whether the scaling exponents of the linear model (either shell model or Navier-Stokes) are anomalous. What remains is to find out whether they are also universal, and this is what we attempt to find in the rest of this paper. 5 Fixed Point Properties For the shell model, we consider the chain of equations (s) i dwn = Φn (w(s−1) , w(s) ) − νkn2 wn(s) + fn(s) . dt 3 (12) 42 I. Procaccia et al. Such a chain of equations has, in addition to the dependence on the initial field, also free parameters δ (s) .

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