Which risk increases when fluid velocity exceeds design limits, particularly related to computational solvers relying entirely on the Reynolds-Averaged Navier-Stokes (RANS) equation?

💡 Explanation

Exceeding design velocities leads to turbulence that is not fully resolved by solely RANS. This causes spurious amplification of numerical diffusion because the model struggles to accurately capture the small-scale turbulent fluctuations; therefore, it introduces artificial dissipation, rather than simulating turbulence.

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