No, 'the latter', if it refers to anything, refers to 'axisymmetric'; 'the former' would seem to refer to nothing in your sentences. To use 'former' and 'latter', there must be two clearly parallel cases, events, alternatives, etc. ' To make use of these terms in your passage, you will have to clarify the relationship by recasting to something like: ' True 2D flow alone may be difficult to achieve in the lab.
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