Bechmann, Andreas

Berg, Jacob

Koblitz, Tilman

Réthoré, Pierre-Elouan

Sogachev, Andrey

Sørensen, Niels N.

Online Research Database In Technology

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Downloaded from orbit.dtu.dk on: Dec 20, 2017Atmospheric stability and complex terrain - Comparing measurements and CFDKoblitz, Tilman; Bechmann, Andreas; Berg, Jacob; Sogachev, Andrey; Sørensen, Niels N.; Réthoré,Pierre-ElouanPublication date:2012Link back to DTU OrbitCitation (APA):Koblitz, T., Bechmann, A., Berg, J., Sogachev, A., Sørensen, N. N., & Réthoré, P-E. (2012). Atmosphericstability and complex terrain - Comparing measurements and CFD [Sound/Visual production (digital)]. Thescience of Making Torque from Wind 2012, Oldenburg, Germany, 09/10/2012,http://www.forwind.de/makingtorqueAtmospheric stability and complex terrain Comparing measurements and CFD   T. Koblitz  A. Bechmann  J. Berg A. Sogachev  N. N. Sørensen P.-E. Réthoré   DTU Wind Energy, Technical University of Denmark Atmospheric stability Chimney plume under stable and unstable conditions 2 Source: kindly been provided by  Dr. Torben Mikkelsen, Risø DTU and  Dr. Thomas Ellermann,  National Environmental Research Institute stable unstable 10 October 2012 DTU Wind Energy, Technical University of Denmark Atmospheric stability Why: Influence on the wind field 3 Source: Kaimal and Finnigan 1994, Wallace and Hobbs 2006 heat flux heat flux Flat terrain Source: Kaimal and Finnigan 1994, Wallace and Hobbs 2006 10 October 2012 DTU Wind Energy, Technical University of Denmark Atmospheric stability Why: Influence on the wind field 4 Complex terrain unstable neutral stable 10 October 2012 DTU Wind Energy, Technical University of Denmark The Benakanahalli experiment Stratification and Complex Terrain 5 10 October 2012 DTU Wind Energy, Technical University of Denmark The Benakanahalli experiment Location and instrumentation 6 -800m 800m 0m M0 M1 M1a M2 M3 800m 700m 600m 10 October 2012 DTU Wind Energy, Technical University of Denmark The Benakanahalli experiment Location and instrumentation 7 10 October 2012 DTU Wind Energy, Technical University of Denmark The Benakanahalli experiment Wind climate 8 Wind rose at M0 10 October 2012 DTU Wind Energy, Technical University of Denmark Benchmark dataset Selected data: 3 days in February 2010 9 10 October 2012 DTU Wind Energy, Technical University of Denmark Benchmark dataset Averaged data and model forcing 10 10 October 2012 DTU Wind Energy, Technical University of Denmark Simulating Benakanahalli Modeling atmospheric stability in CFD       k-e turbulence model:         11 RANS equations Energy equation Coriolis forcing 10 October 2012 DTU Wind Energy, Technical University of Denmark Simulating Benakanahalli Precursor simulation vs. Measurements at M0 12 10 October 2012 DTU Wind Energy, Technical University of Denmark Simulating Benakanahalli Precursor simulation vs. Measurements at M0  13 Stability classes based on  Monin-Obukhov length 10 October 2012 DTU Wind Energy, Technical University of Denmark Simulating Benakanahalli Computational mesh and boundary conditions 14 1D 3D M0 M1 M3 10 October 2012 DTU Wind Energy, Technical University of Denmark Simulating Benakanahalli Wind speed and direction: comparison of modeled and observed data 15 10 October 2012 DTU Wind Energy, Technical University of Denmark Simulating Benakanahalli Contour map of terrain 16 10 October 2012 Wind rose Wind direction in 20m EAST SOUTH WEST NORTH Geostrophic wind stable unstable stable (flat terrain) unstable (flat terrain) DTU Wind Energy, Technical University of Denmark Simulating Benakanahalli Contour map of terrain 17 10 October 2012 Wind rose Wind direction in 20m EAST SOUTH WEST NORTH Geostrophic wind stable unstable stable (flat terrain) unstable (flat terrain) unstable (Fr  < -0.15) neutral  stable (Fr  > -0.15) DTU Wind Energy, Technical University of Denmark Simulating Benakanahalli Unstable conditions: wind field at 12 p.m. 18 unstable 10 October 2012 DTU Wind Energy, Technical University of Denmark Simulating Benakanahalli Stable conditions: wind field at 1 a.m. 19 stable 10 October 2012 DTU Wind Energy, Technical University of Denmark Conclusions: • Stability effects and Coriolis force implemented in EllipSys3D • Methodology is generally applicable • Improvement in predicting the airflow over Benakanahalli during non-neutral conditions  Future work: • Get more information about boundary and intial conditions • Mesoscale simulations to provide information on large scales • Generate roughness map to replace uniform roughness • Different parameterizations in turbulence model Conlcusions & Future work 20 10 October 2012 DTU Wind Energy, Technical University of Denmark Terrain effects on M0 Simulating Benakanahalli 21 Elevation profile upstream of M0 700m 600m 0km 12km M0 M0 10 October 2012 

Atmospheric stability and complex terrain - Comparing measurements and CFD

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Atmospheric stability and complex terrain - Comparing measurements and CFD

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