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<p>Air-entrained bubbles around a hull form exhibit spatial and temporal longevity, posing a threat to the vessel’s stealth signature. In this paper, Computational Fluid Dynamics (CFD) based studies employing the Detached Eddy Simulation (DES) turbulence model in combination with the Volume of Fluid (VOF) approach are used to investigate unsteady multiphase flow around a Wigley hull. Asymmetric wave profiles, lateral wave making behaviour, air entrainment, and vortical structures were all captured reasonably well by the numerical setup, which was first verified against published experimental and numerical results for a 10° drift angle at a Froude number (<i>Fr</i>) of 0.181 in calm water. Additional simulations were carried out with the hull exposed to regular waves at a 12° drift with a <i>Fr</i> of 0.42 in order to evaluate the DES model under more realistic conditions at sea. A case with the hull fixed and another with the hull free to move in heave and pitch were examined. Particularly in the vicinity of the windward (port side) aft region, the results demonstrated that DES successfully captured air entrainment, vortex shedding, free-surface deformation and the presence of bubbles. Visualizations based on the Q-criterion validated how wave- interaction and vessel motions affects wake behaviour. On the whole, the DES-VOF framework in a CFD solver can accurately model air-entrained turbulent flows for predicting the presence of bubbles and making it ideal for advanced naval hydrodynamic applications.</p>

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Towards the Investigation on the Efficacy of DES Turbulence Model in Predicting Air Entrained Bubbles Around a Wigley Hull

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Sheeja Janardhanan,
  • Avinash Godey,
  • Srija Sravani Donthamsetty,
  • Manu Korulla

摘要

Air-entrained bubbles around a hull form exhibit spatial and temporal longevity, posing a threat to the vessel’s stealth signature. In this paper, Computational Fluid Dynamics (CFD) based studies employing the Detached Eddy Simulation (DES) turbulence model in combination with the Volume of Fluid (VOF) approach are used to investigate unsteady multiphase flow around a Wigley hull. Asymmetric wave profiles, lateral wave making behaviour, air entrainment, and vortical structures were all captured reasonably well by the numerical setup, which was first verified against published experimental and numerical results for a 10° drift angle at a Froude number (Fr) of 0.181 in calm water. Additional simulations were carried out with the hull exposed to regular waves at a 12° drift with a Fr of 0.42 in order to evaluate the DES model under more realistic conditions at sea. A case with the hull fixed and another with the hull free to move in heave and pitch were examined. Particularly in the vicinity of the windward (port side) aft region, the results demonstrated that DES successfully captured air entrainment, vortex shedding, free-surface deformation and the presence of bubbles. Visualizations based on the Q-criterion validated how wave- interaction and vessel motions affects wake behaviour. On the whole, the DES-VOF framework in a CFD solver can accurately model air-entrained turbulent flows for predicting the presence of bubbles and making it ideal for advanced naval hydrodynamic applications.