The spectral dynamics of isotropic decaying turbulence with polymer additives is numerically investigated using a hybrid Eulerian-Lagrangian approach with making use of large-scale parallel computation.We found that the kinetic energy and pressure variance spectra obeyed the power law E(k) ～ k~(?α) and E_p(k) ～ k~(?β) in the scale range below the Kolmogorov length l_K when the turbulence sufficiently decayed while the Weissenberg number W_i remained greater than unity. The exponents α and β were found to be α = 4.1 ? 4.6 and β = 2.8 ? 3.2, respectively, and were found to decrease with increasing Wi.We discuss the similarities and differences between the present results and the results of previous experimental and numerical studies for elastic turbulence, which is characterized by W_i 1 and a Reynolds number below unity.
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