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Onset of Primary and Secondary Instabilities of Viscoelastic Fluids Saturating a Porous Layer Heated from below by a Constant Flux

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Figure 1. The porous rectangular cavity heated from below by a constant flux.
Figure 2. Neutral stability curves: (a) stationary instability; (b) oscillatory instability.
Figure 3. (a) Critical Rayleigh number and (b) critical frequency at the onset of oscillatory convectionas a function of λ1 for different values of Γ
Figure 4. Critical Rayleigh number against the lateral aspect ratio with different number of rolls(L = 1: red dashed curve , L = 2: green dotted curve, L = 3: black dash dotted curve and L = 4: bluedensely dotted curve): (a) steady longitudinal rolls; (b) o
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