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ACCOUNTING FOR TURBULENCE DESTRUCTION IN THE FLOW OVER FORESTS

A. Silva Lopes
CEsA - Centre for Wind Energy and Atmospheric Flows Faculdade de Engenharia da Universidade do Porto Rua Dr. Roberto Frias, s/n - 4200-465 Porto - Portugal

J. M. L. M. Palma
CEsA - Centre for Wind Energy and Atmospheric Flows Faculdade de Engenharia da Universidade do Porto Rua Dr. Roberto Frias, s/n - 4200-465 Porto - Portugal

J. Viana Lopes
CEsA - Centre for Wind Energy and Atmospheric Flows Faculdade de Engenharia da Universidade do Porto Rua Dr. Roberto Frias, s/n - 4200-465 Porto - Portugal

Аннотация

Large-eddy simulations of the flow over a long homogeneous forest were used to calibrate the canopy related terms in a RaNS k-ε turbulence model. It was found that the canopy drag always acts to decrease both the turbulent kinetic energy and its dissipation. The flow across a forest edge was used to see whether the model was also accurate in a more complex flow, with a finite length forest. The effects of the canopy were overestimated in an initial part, but, overall, the accuracy approached the levels found in the case of the long forest.