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Omnivor

Submitted by Emmanuel Branlard on May 4, 2015 - 6:11pm
Main hypothesis

Homogeneous Incompressible Newtonian fluid under conservative forces, viscous splitting assumption (separate convection/diffusion steps).

Omnivor is a vortex code that uses Lagrangian tracking of vorticity using low order singular and regularized vortex elements. Bodies may be represented using source elements.

Elements intensities may be a combination of prescribed intensities, intensities determined by solving of non-penetration condition or intensities determined using tabulated profile data and a Lifting line formulation.

Software
Solver
Omnivor
License
Regime
Turbulence
Turbulence closure
Turbulence model

The turbulence model for the atmospheric turbulence is based on the Mann model (Mann, 1998)

Atmospheric boundary layer
Range
Coriolis
No
Atmospheric Stability
Atmospheric Stability
Yes
Stability model
Stability included by adjusting turbulence parameters like length scale, degree of isotropy and turbulence intensity
Canopy
Forest canopy
No
Wind farm
Wind turbine
Yes
Rotor model
Wake model
Wind farm range
Additional information

Rotor models: liting lines using tabulated data, lifting surface (inviscid, no boundary layer) or thick panel (inviscid, no boundary layer)

Wake model: vortex free-wake with relaxation performed using 1st 2nd or 4th order schemes and diffusion performed in a separate step.

References

Branlard ESP, Dixon K, Gaunaa M. 2013. Vortex methods to answer the need for improved understanding and modelling of tip-loss factors. I E T Renewable Power Generation. 7(4):311-320. Mann J., 1998, Wind Field Simulation. Probabilistic Engineering Mechanics; 13(4): 269–283. Elsevier Science.