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The Influence of Turbulence Model on Wake Structure of TSTs when used with a Coupled BEM-CFD Model. Ian Masters, R. Malki, Alison Williams & Nick Croft Marine Energy Research Group Swansea University. Modelling Approach. Moving Mesh Approach. Time-averaged Approach.

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the influence of turbulence model on wake structure of tsts when used with a coupled bem cfd model

The Influence of Turbulence Model on Wake Structure of TSTs when used with a Coupled BEM-CFD Model

Ian Masters, R. Malki, Alison Williams & Nick Croft

Marine Energy Research Group

Swansea University

modelling approach
Modelling Approach

Moving Mesh Approach

Time-averaged Approach

Source: A. Mason-Jones , PhD thesis

Cardiff University (2010)

model domain
Model Domain

0.17m

1.54m

0.84m

0.5m

0.25m

0.17m

0.5m

0.84m

1.4m

95 wake edges
95% Wake Edges

P95%

P∞

PWAKE

P∞

turbulence models
Turbulence Models

k-epsilon

  • Eddy viscosity from single length scale
  • Turbulent diffusion occurs only at specified scale

RNG k-epsilon

  • Account for different scales of motion

k-omega

  • Viscous sub-layer flows
  • Adverse pressure gradients and separating flows
turbulence models1
Turbulence Models

Shear Stress Transport (SST)

  • k-ω near boundary
  • k-ε in free-stream
  • Adverse pressure gradients & separating flows

Reynolds Stress Model (RSM)

  • Reynolds Stresses directly computed
  • Directional effects of Reynolds stress fields
  • More suitable for anisotropic turbulence
conclusions
Conclusions
  • Turbulence Models affect Hydrodynamics
  • Lack of Measured Data for Validation
  • Possibly better represent turbulence