Generalization of Hopf Functional Equation

IntroductionThe techniques ofcharacteristic functionals of fluidmechanical fields are widely used in solving thegeneral problem of turbulence. Thesecharacteristic functionals uniquely define theprobability distributions P(dω) in the phase spaceof turbulent flow,which would give a completesolution of the problem of turbulence.Thetechniques of using a characteristic functional todefine the random field of any fluid dynamicquantity were first pointed out by Kolmogorov(1 93 5 ) ,since then a num…

Generalization of Hopf Functional Equation

This paper generalizes the Hopf functional equation in order to apply it to a wider class of not necessarily incompressible fluid flows. We start by defining characteristic functionals of the velocity field, the density field and the temperature field of a compressible field. Using the continuity equation, the Navier-Stokes equations and the equation of energy we derive a functional equation governing the motion of an ideal gas flow and a van der Waals gas flow, and then give some general methods of deriving a functional equation governing the motion of any compressible fluid flow. These functional equations can be considered as the generalization of the Hopf functional equation.