The central differencing scheme gives good results when _____________(a) the grid is coarse(b) the grid is very fine(c) the grid is Cartesian and uniform(d) the gird is on-CartesianI got this question by my school teacher while I was bunking the class.My doubt is from Convection-Diffusion Problems topic in chapter Convection-Diffusion Problems of Computational Fluid Dynamics

The central differencing scheme gives good results when _____________(

1.	The central differencing scheme gives good results when _____________(a) the grid is coarse(b) the grid is very fine(c) the grid is Cartesian and uniform(d) the gird is on-CartesianI got this question by my school teacher while I was bunking the class.My doubt is from Convection-Diffusion Problems topic in chapter Convection-Diffusion Problems of Computational Fluid Dynamics
Answer» CORRECT option is (b) the GRID is very FINE Explanation: The CENTRAL differencing scheme is good when the cell Peclet number is LESS than 2. For this, the grid should be very fine. So, the central differencing scheme is good to use when the grid is fine.

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