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Discretization of the transient term is not affected by uniform or non-uniform grids when _________

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Discretization of the transient term is not affected by uniform or non-uniform grids when _________

(a) the scheme is downwind

(b) the scheme is upwind

(c) the scheme is first-order

(d) the scheme is second-order

This question was addressed to me in examination.

The query is from Approaches for Non-uniform Time Steps in portion Transient Flows of Computational Fluid Dynamics

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Correct option is (c) the scheme is first-order

Easiest explanation: Since the second-order schemes use a stencil with two time-steps in the same direction, only the second-order schemes are affected by the non-uniformity of the grids. The first-order schemes are not affected.

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