Abstract
Linear and nonlinear (energy) stability analysis are performed for a layer of couple-stress fluid with different types of internal heat source profiles. The paper presents the numerical and graphical results for couple-stress fluid when it is influenced by an internal heat source and heated from below. Linear instability is performed by normal mode technique and energy method is used for nonlinear stability analysis. The effects of couple-stress parameter and internal heat source on the stability and instability boundaries are analyzed numerically using Chebyshev pseudospectral method.
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