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.
Phan-Thien, Coaxial-disk flow of an Oldroyd-B fluid: exact solution and stability, Journal of Non-Newtonian Fluid Mechanics 13, 325 (1983)
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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.