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While using the Cartesian grids, the coefficient matrix becomes ____________

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in Computational Fluid Dynamics by (118k points)
While using the Cartesian grids, the coefficient matrix becomes ____________

(a) a square matrix

(b) an upper triangular matrix

(c) a diagonal matrix

(d) a lower triangular matrix

The question was posed to me in an online interview.

Query is from Diffusion Problem in section Diffusion Problem of Computational Fluid Dynamics

1 Answer

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Best answer
Right choice is (c) a diagonal matrix

Best explanation: The coefficient matrix in the least-square method gives a square matrix. While substituting the required values in this square matrix for the Cartesian grids, the matrix is reduced into a diagonal one.

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