A roughness wall model based on the equivalent sandgrain roughness approach that accounts for the log-law solution for turbulent boundary layer over fully rough surfaces is implemented into a viscous flow solver called NavyFOAM. The rough wall model is implemented as a wall function and is used in conjunction with the k-ω turbulence model. The roughness model is validated against experiments conducted on rough plates in a water tunnel and towed in a channel. Two sets of simulations, single-phase Reynolds-Averaged Navier-Stokes (RANS) and two-phase unsteady RANS were conducted to validate the current roughness model. Current results show good agreement with the roughness functions (ΔU+) and is within 1.5% of the experimental results. The overall frictional resistance predicted for the rough plates towed in a water channel is within 2% of the experimentally obtained results. With these promising results, the aim is to develop a computational capability for predicting added hull resistance due to biofouling.
- Fluids Engineering Division
A Numerical Approach for Modeling Roughness for Marine Applications
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Vargas, A, & Shan, H. "A Numerical Approach for Modeling Roughness for Marine Applications." Proceedings of the ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1B, Symposia: Fluid Mechanics (Fundamental Issues and Perspectives; Industrial and Environmental Applications); Multiphase Flow and Systems (Multiscale Methods; Noninvasive Measurements; Numerical Methods; Heat Transfer; Performance); Transport Phenomena (Clean Energy; Mixing; Manufacturing and Materials Processing); Turbulent Flows — Issues and Perspectives; Algorithms and Applications for High Performance CFD Computation; Fluid Power; Fluid Dynamics of Wind Energy; Marine Hydrodynamics. Washington, DC, USA. July 10–14, 2016. V01BT30A005. ASME. https://doi.org/10.1115/FEDSM2016-7791
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