Electronic Journal of Differential Equations,
Vol. 2010(2010), No. 110, pp. 1-19.

Title: Effect of hyperviscosity on the Navier-Stokes turbulence
       
Author: Abdelhafid Younsi (USTHB, Algiers, Algeria)

Abstract:
 In this article, we modified the Navier-Stokes equations by
 adding a higher order artificial viscosity term to the conventional
 system. We first show that the solution of the regularized system
 converges strongly to the solution of the conventional system as
 the regularization parameter approaches zero, for each dimension
 $d\leq 4$. Then we show that the use of this artificial viscosity
 term leads to truncated the number of degrees of freedom in the
 long-time behavior of the solutions to these equations.
 This result suggests that the hyperviscous Navier-Stokes system
 is an interesting model for three-dimensional fluid turbulence.

Submitted December 2, 2009. Published August 09, 2010.
Math Subject Classifications: 76D05, 76F20, 35B30, 35B41, 
                              35B65, 37L30, 37K40.
Key Words: Navier-Stokes equations;  hyperviscosity;
           weak solutions; attractor dimension; turbulence models

An addendum was attached on September 27, 2011. It corrects some misprints and presents another proof of estimates for the dimension of the attractor.