An Application of Two-Layer k-ε Model to Ship Flow Computation

Abstract

A numerical method is developed for calculating ship boundary layers and wakes for zero Froude number (i. e., the free surface is considered to be flat and treated as a plane of symmetry). The Reynolds-averaged Navier-Stokes and continuity equations are solved with the two-layer k-ε turbulence model. The results are validated through comparisons with the experimental data for the Series 60C_B=.6 ship model and results of the precursory wall function as well as the Baldwin-Lomax model approaches. The three turbulence models yield satisfactory results; however, the present and Baldwin -Lomax model results indicate improved resolution of the flow close to the hull and wake centerplane due to near-wall turbulence modeling. An overview is given of the present approach, and a discussion is provided of the relative performance of three turbulence models. Lastly, some concluding remarks are made, including the requirements and prognosis for improvements.