Differencing scheme for transport equation may be:
- Centered in space: The preferred general method.
- Backward (upstream) in space: Less accurate than centered in space, but
can be used to avoid oscillations when coarse spacing is used.
- Centered in time: (Crank-Nicholson scheme) Generally gives a
more accurate simulation but could cause oscillations.
- Backward in time: (Fully implicit scheme) Generally gives a
less accurate simulation but may be needed to avoid oscillations.
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