FENE-P shearing flows have up to six continuous spectra; for L>50 three are nearly identical and β-independent while two novel β-dependent spectra allow phase speeds outside the base velocity range including negative values.
Here, the CS are curved, tilting down from left to right, and extend into the right half of the complex plane
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Nature of continuous spectra in wall-bounded shearing flows of FENE-P fluids
FENE-P shearing flows have up to six continuous spectra; for L>50 three are nearly identical and β-independent while two novel β-dependent spectra allow phase speeds outside the base velocity range including negative values.