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While changing the coordinates from Cartesian to non-orthogonal in the Finite Difference Method, which of the following remains the same?

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While changing the coordinates from Cartesian to non-orthogonal in the Finite Difference Method, which of the following remains the same?

(a) all the terms in the equation

(b) conservation properties of the equation

(c) number of terms in the equation

(d) source terms of the equation

This question was posed to me by my college professor while I was bunking the class.

My question is based upon Numerical Methods in division Numerical Methods of Computational Fluid Dynamics

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The correct option is (b) conservation properties of the equation

Explanation: In the Finite Difference Method, while changing from Cartesian to non-orthogonal grids, the terms change and the number of terms increases. But, the conservation properties of the equation remain the same.

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