Development of WakeLES: a two-phase large-eddy simulation capability for the turbulent free-surface air-entraining bubbly flow near wake of a surface ship
Abstract
Development of WakeLES: a two-phase large-eddy simulation capability for the turbulent free-surface air-entraining bubbly flow near wake of a surface shipWe propose a four-year fundamental research effort to develop a two-phase Large-Eddy Simulation (hereafter WakeLES) capability for predicting the complex 3D free-surface turbulent (FST) flow in the near wake of a surface ship. WakeLES will model, characterize, and predict quantitatively the incompressible highly-variable density turbulence (IHVDT); the violent wavebreaking and air-entraining free surface; as well as the volume, spatial-temporal distribution,and size spectra of the entrained air. By incorporating appropriate inflow, initial and boundary conditions, WakeLES will be capable of modeling and prediction for different ship speeds and hull characteristics, as well as ambient incident wavefield and currents.The proposed research builds on substantial theoretical and computational (direct numerical simulation (DNS) and implicit large-eddy simulation (iLES)) work by this MIT team on the canonical ship wake problem and underlying turbulent air-entraining flows. These include elucidation of the surface and flow features and their scaling with geometry and speed (Hendrickson et al. 2019a); the URANS closure modeling of the wake IHVDT (Hendrickson & Yue 2019b); the dependence of FST air entrainment volume on the Froude and Weber number (Yu et al. 2019a); a new scaling law on the size spectra of FST bubble entrainment (Yu et al. 2019b); and parameterization of air entrainment volume in vortical free-surface interactions in FST.While we have arrived at a unique position and are fully equipped to carry out the proposed research, the research agenda to develop WakeLES represent significant challenges. On the critical path are the implementation of large-eddy simulation (LES) for the bubbly (IHVDT) turbulent flow; the development of large-wave simulation (LWS) for the violent/breaking/entraining (air-water) mixed-flow free surface; and the incorporation of largebubble simulation (LBS) for capturing the entrained bubbles and their evolution. In addition, the proposed work must be envisaged as an essential part of a larger effort involving highfidelityquantitative laboratory experiments to validate the LES/LWS/LBS models, as well as other modeling/computational efforts to assess the efficacy of WakeLES for realistic ship hulls and near-field environmental input.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 17, 2020
- Source ID
- N000142012059
Entities
People
- Dick K P Yue
Organizations
- Massachusetts Institute of Technology
- Office of Naval Research
- United States Navy