TDMA and PDMA are particularly suitable for _____________(a) Cartesian grid problems(b) Curvilinear grid problems(c) Unstructured grid problems(d) Structured grid problemsThis question was posed to me at a job interview.Question is from Numerical Methods in division Numerical Methods of Computational Fluid Dynamics

TDMA and PDMA are particularly suitable for _____________(a) Cartesian

1.	TDMA and PDMA are particularly suitable for _____________(a) Cartesian grid problems(b) Curvilinear grid problems(c) Unstructured grid problems(d) Structured grid problemsThis question was posed to me at a job interview.Question is from Numerical Methods in division Numerical Methods of Computational Fluid Dynamics
Answer» Correct option is (d) Structured grid problems Explanation: When a structured grid is used for discretization, it RESULTS in a coefficient matrix with its non-zero ELEMENTS aligning along a few diagonals. The NUMBER of non-zero diagonals DEPENDS on the discretization stencil and the dimension of the problem. So, TDMA and PDMA are suitable to solve this kind of banded matrix.

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