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When the Peclet number is zero, the isolines are ___________

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When the Peclet number is zero, the isolines are ___________

(a) hyperbolic

(b) elliptic

(c) circular

(d) parabolic

I had been asked this question during a job interview.

This intriguing question comes from Discretization Aspects topic in division Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

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Right answer is (c) circular

To explain: When the Peclet number is zero, the isolines of flow property are circular with the current node at its centre. Here, diffusive strength dominates.

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