Comparison of PANS and LES of the flow past a generic ship. (1st October 2018)

• Record Type: Journal Article
• Authors: Zhang, Jie; Minelli, Guglielmo; Rao, Anirudh Narayan; Basara, Branislav; Bensow, Rickard; Krajnović, Siniša
• Is Part Of: Ocean engineering. Volume 165(2018)
• Page Start: 221
• Page End: 236
• Publication Date: 2018-10-01
• Subjects: PANS -- LES -- Generic ship -- Bi-stability -- Separated flows; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2018.07.023
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: The prediction of flow past a generic ship has been performed using partially-averaged Navier–Stokes (PANS) turbulence model. The Reynolds number based on the width of the ship is 8 × 10 4 . A detailed comparison with resolved large-eddy simulation (LES) solution and available experimental data is made for a better understanding of the capability of PANS in predicting the turbulent flow in the wake. The results show that PANS produces similar trends to those predicted by LES. However, a coarse grid resolution will lead PANS to act as unsteady Reynolds-averaged Navier–Stokes (URANS). Although the geometry is symmetric for the incoming flow at a zero yaw angle, bi-stable behaviour is observed in the wake, contributing to an asymmetric flow distribution on the heli-deck. Highlights: Flow past a generic ship has been predicted using PANS and LES. A comparison of PANS results with the LES solution and available experimental data was made. PANS simulations show similar trends to those predicted by LES for this generic ship model. Bi-stable behaviour in the turbulent wake is observed; with the two possible equilibrium flow states exhibiting a high degree of asymmetry.