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Seminar, Vuko Vukcevic

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July 6 @ 1:30 pm - 2:30 pm

| Free

Marine and O shore Hydrodynamics with the Naval Hydro Pack

 

Presented by, Vuko Vukcevic
University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Ivana

 

Abstract:
The CFD model in the Naval Hydro pack for marine hydrodynamics is discussed in detail, revealing all relevant numerical modeling details and presenting extensive validation and verification results. The first part of the presentation will focus on unique numerical modeling capabilities in the Naval

Hydro pack:

  •  Ghost Fluid Method (GFM) [1, 2] for in finitesimally sharp representation of free surface (interface{
    corrected density and dynamic pressure discretization schemes) [5, 6],
  •  Interface capturing via:
    -Geometric Volume-of-Fluid method: isoAdvector [4],
    -Algebraic Volume-of-Fluid method using compressive numerical schemes,
    -Implicitly redistanced Level Set Method [5].
  •  Solution decomposition via SpectralWave-Explicit Navier-Stokes Equations (SWENSE) method
    for efficient wave propagation [8, 9],
  •  Extensive wave modeling library including Higher Order Spectrum (HOS) nonlinear potential flow method,
  •  Efficient and accurate propeller modeling with actuator disc.

Recent validation and verifi cation will be presented in detail, where special focus will be given on efficient seakeeping simulations at head and oblique waves, comparing results with experiments and other CFD codes [7]. The results for the self{propelled REGAL ship (within first Lloyd’s Workshop on Ship Scale Computer Hydrodynamic Simulation [3]) and a car carrier (built in Croatian shipyard Uljanik) are directly compared to sea trials. The results include numerical uncertainty assessment via grid re finement study. Furthermore, green water eff ects are veri fied and validated against experimental data, where it is shown that the numerical  uncertainty is of the same order as the experimental uncertainty.

Finally, a future roadmap of the Naval Hydro pack is shown, presenting unique numerical capabilities we are currently developing: pseudo{spectral nonlinear Harmonic Balance method and monolithic 6DOF{pressure equation coupling.

Details

Date:
July 6
Time:
1:30 pm - 2:30 pm
Cost:
Free

Venue

Stanley Hydraulics Lab
127 SHL
Iowa City, IA 52242 United States
Phone:
319-335-5237
Posted on June 28th, 2017

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