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The Arbitrary Lagrangian-Eulerian method is advantageous for ___________

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The Arbitrary Lagrangian-Eulerian method is advantageous for ___________

(a) Curvilinear grids

(b) Non-orthogonal grids

(c) Cartesian grids

(d) Orthogonal grids

This question was addressed to me in an international level competition.

My question is taken from Incompressible Flows topic in division Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

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Right answer is (b) Non-orthogonal grids

To elaborate: The Arbitrary Lagrangian-Eulerian method has some advantages for the non-orthogonal grids. One of these advantages is that the pressure at the boundaries need not be specified here.

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