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What is the cost of flexibility in unstructured grids?

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What is the cost of flexibility in unstructured grids?

(a) Consistency

(b) Stability

(c) Accuracy

(d) Complexity

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Question is from FVM topic in chapter Finite Volume Methods of Computational Fluid Dynamics

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The correct option is (d) Complexity

Easy explanation: All these properties such as consistency, stability and accuracy depends upon the method used for discretization. They do not depend on whether the grid is structured or unstructured. The cost of increased flexibility in unstructured grids is its complexity.

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