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Stability of explicit transient schemes is related to _________

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Stability of explicit transient schemes is related to _________

(a) over-relaxation

(b) the time-step

(c) the grid size

(d) under-relaxation

The question was asked in examination.

My doubt stems from Discretization Aspects in section Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

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Correct answer is (b) the time-step

Easiest explanation: Stability of transient schemes vary for implicit and explicit problems. Stability of explicit transient scheme is ensured by limiting the time-step size. Stability of implicit transient scheme is improved by under-relaxing the equations.

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