In order to study the polymer effect on the behavior of nonlinearities in decaying homogeneous isotropic turbulence (DHIT),\r\ndirect numerical simulations were carried out for DHIT with and without polymers.We investigate the nonlinear processes, such\r\nas enstrophy production, strain production, polymer effect, the curvature of vortex line, andmany others. The analysis results show\r\nthat the nonlinear processes like enstrophy production (and many others) are strongly depressed in regions dominated by enstrophy\r\nas compared to those dominated by strain either in the Newtonian fluid case or in polymer solution case. Polymers only decrease\r\nthe values of these parameters in the strongest enstrophy and strain regions. In addition, polymer additive has a negative effect on\r\nenstrophy and strain production, that is, depression of nonlinearity in DHIT with polymers.
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