Depression of nonlinearity in decaying isotropic turbulence
Abstract
Simulations of decaying isotropic NavierStokes turbulence exhibit depression of the normalized meansquare nonlinear term to 57 percent of the value for a Gaussianly distributed velocity field with the same instantaneous velocity spectrum. Similar depression is found for dynamical models with random coupling coefficients (modified Betchov models). This suggests that the depression is dynamically generic rather than specifically driven by alignment of velocity and vorticity.
 Publication:

Physics of Fluids
 Pub Date:
 September 1988
 Bibcode:
 1988PhFl...31.2395P
 Keywords:

 Computational Fluid Dynamics;
 Flow Stability;
 Isotropic Turbulence;
 NavierStokes Equation;
 Vorticity;
 Computerized Simulation;
 Flow Velocity;
 Least Squares Method;
 Normal Density Functions;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer