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What are zonal grids?

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What are zonal grids?

(a) Grids generated for a particular zone of the domain of interest

(b) Grids varying at different zones

(c) Grids generated for a particular time in the flow

(d) Grids varying with time

I had been asked this question by my school teacher while I was bunking the class.

This key question is from Discretization Aspects in division Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

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The correct choice is (a) Grids generated for a particular zone of the domain of interest

The explanation: While dealing with a complex problem, grids are generated separately for different zones which are called zonal grids. These are then attached together to form grids for the whole domain.

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