Flows should generally be modeled in three dimensions; however, in certain cases, two-dimensional calculations may be sufficient, particularly for wind effects on elongated structures like bridge cross-sections. In RANS simulations, a 3D system with only one element in the thickness direction is used. In contrast, LES simulations require a sufficiently large area transverse to the main flow direction to correctly depict turbulence characteristics.
D1.1 Spatial Dimensions: 3D or 2D
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