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The zero sum rule and the opposite signs rule are applicable to _______________

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The zero sum rule and the opposite signs rule are applicable to _______________

(a) each discretized equation

(b) the global matrix

(c) the coefficients of each discretized equation

(d) the coefficient matrix

I got this question in unit test.

This interesting question is from Diffusion Problem topic in division Diffusion Problem of Computational Fluid Dynamics

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The correct option is (c) the coefficients of each discretized equation

The explanation: A proper discretization should result in a discretized algebraic equation that reflects the characteristics of the original conservation equation. The coefficients of each discretized equation should satisfy the zero sum and the opposite signs rules.

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