Richard J.A.M. Stevens

Professor at the University of Twente

Wind energy · Turbulence · Environmental flows

Publication 111 · Wind-farm flow

Turbulence coherence in wind farms

Y. Liu, R.J.A.M. Stevens, J. Phys. Conf. Ser., 2767, 092108 (2024).

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Main finding

Turbine operating state changes the frequency-dependent coherence of velocity, thrust and power in the tested LES. The result does not establish a universal corrected coherence law.

Turbulence coherence magnitude and phase in a wind farm at fixed thrust coefficient
How to read the figure. Coherence magnitude and phase of the velocity fluctuations through a wind farm with every turbine held at a constant thrust coefficient of 0.8. Figure 6 shows the same panels for turbines under normal operation, and the difference between the two is the evidence that operating state changes coherence - neither figure carries it alone. The result is bounded to this simulation; it is not a corrected coherence law. Open the full-resolution figure. Figure 8. Y. Liu and R.J.A.M. Stevens (2024). No separate licence is stated here; consult the original publication and credited source before reuse.

Why this matters

Turbine operating state changes the frequency-dependent coherence of velocity, thrust, and power fluctuations in the simulated wind farm.

Research context

Directly tests a coherence framework adjacent to Modeling space-time correlations of velocity fluctuations in wind farms (read the finding) and bounds turbulence-only assumptions. Builds on Large eddy simulation studies of the effects of alignment… (read the finding), Flow Structure and Turbulence in Wind Farms (read the finding), and cited Tobin–Chamorro studies.

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