Hybrid Modeling for Wind Farm Simulation and Control

Christiane Adcock, Stanford University

Photo of Christiane Adcock

High fidelity wind farm models accurately represent only a subset of the following: blade boundary layer dynamics, wake-atmospheric boundary layer (ABL) interactions, and turbine-turbine interactions. I modify Active Model Split (AMS), a new hybrid Reynolds-Averaged Navier Stokes (RANS)-large eddy simulation (LES) model to capture all these effects. For the RANS contribution to AMS, I use SST 𝑘 − 𝜔, which is accurate in adverse pressure gradients, such as those near wind turbine blades, and in the freestream, such as in the ABL — unlike other RANS model more typically used to simulate the ABL, such as 𝑘 − 𝜀. I develop SST k-omega and then AMS to simulate the ABL with the Coriolis effect and buoyancy. To enable blade-resolved simulations of multiple wind turbines, a computationally expensive problem, I implement this work in the massively parallel flow solver, Nalu-Wind. I compare results from SST 𝑘 − 𝜔; and AMS to those from 𝑘 − 𝜀, LES, and the hybrid RANS-LES model SIDDES.

Abstract Author(s): Christiane Adcock, Marc Henry de Frahan, Jeremy Melvin, Gianluca Iaccarino, Robert Moser, Michael Sprague