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In the early days, CFD simulations were limited to two-dimensional analyses. Three-dimensional analyses could not be performed because of _________

a) Complex mathematical models were not resolved
b) Governing equations were not developed for three-dimensions
c) Approximations for three-dimensions did not exist
d) The type of computers and algorithms that existed

Answer: d
Explanation: The computers and algorithms that existed that time was not suitable for three-dimensional analyses. Storage and speed capacities of computers were not enough.

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