Validation of methods using EllipSys3D
2008 (English)Report (Other academic)
Numerical simulations of the Navier-Stokes equations are performed toachieve a better understanding of the behaviour of wakes generated by windturbines. The simulations are performed by combining the in-house developedcomputer code EllipSys3D with the actuator line and actuator disc methodologies.In the actuator methods the blades are represented by lines or a discat which body forces representing the loading are introduced. The body forcesare determined by computing local angles of attack and using tabulated aerofoilcoefficients. The advantage of using the actuator techniques is that theyare not needed to resolve blade boundary layers. Instead the computationalresources are devoted to simulating the dynamics of the flow structures. Inthe present study we run simulations using both the actuator line and theactuator disc methodologies. The influence from changing a number of parametersis evaluated. The study serves as a validation and sensitivity study toboth the actuator line and the actuator disc methods. The result shows thatboth methods produce realistic results. There is however a sensitivity to someparameters.
Place, publisher, year, edition, pages
Trita-MMK, ISSN 1400-1179 ; 2008:12
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-9914OAI: oai:DiVA.org:kth-9914DiVA: diva2:158177
QC 201007202009-01-302009-01-302010-07-20Bibliographically approved