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If the discretization error is the ratio of grid spacing to time step, then for the system to be consistent, which of these is correct?

If the discretization error is the ratio of grid spacing to time step, then for the system to be consistent, which of these is correct? Correct Answer the ratio should tend to zero

We know that consistency is satisfied if discretization error is zero. When discretization error is the ratio of grid spacing to time step, then actually the ratio should be zero. But, this is not practically possible as the grid spacing cannot be zero. So, grid spacing and time step must be reduced in a way that the ratio tends to zero.

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