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If a model is run at twice the horizontal resolution in both directions and the time step is halved, the computational cost rises by roughly a factor of

  • A.16
  • B.8
  • C.2
  • D.4

Answer: B

Twice as many points in each of two horizontal directions gives four times the work, and halving the time step doubles it again. Adding vertical refinement as well would make it sixteen times. Cost rises very steeply with resolution.

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