A Fast Panel Code for Complex Actuator Disk Flows

S. Gamme, Gael de Oliveira Andrade, Daniele Ragni, F. Lau

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

1 Citation (Scopus)
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A fast, linear scaling vortex method is presented to study inviscid incompressible flow problems involving one or more actuator disks. Building upon previous efforts that were limited to axi-symmetric flow cases, the proposed methodology is able to handle arbitrary configurations with no symmetry constraints. Applications include the conceptual study of wake interaction mechanisms in wind farms, and the correction of wind tunnel blockage effects in test sections of arbitrary shape. Actuator disks represent wind turbines through the shedding of a deformable vortex wake, discretized with a plaid of triangular distributed dipole singularities. An iterative method is adopted to align the wake with the local flow field, which is reconstructed from the vorticity field with a Green function approach. Interactions are computed with a Fast Multipole Method (FMM), effectively overcoming the quadratic scaling of computational time associated with traditional panel methods. When compared to direct computation, the use of an FMM algorithm reduced solution time by a factor 30 when studying the wake of a single actuator disk with 60000 panels. In the same case, the mass flux of the actuator streamtube was conserved to 0:002%. Finally, the presence of round and square impermeable walls around the actuator is considered to demonstrate the code applicability to wind tunnel wall interference correction problems.
Original languageEnglish
Title of host publication55th AIAA Aerospace Sciences Meeting
Subtitle of host publicationGrapevine, USA
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages18
ISBN (Electronic)978-1-62410-447-3
Publication statusPublished - 2017
Event55th AIAA Aerospace Sciences Meeting - Grapevine, United States
Duration: 9 Jan 201713 Jan 2017


Conference55th AIAA Aerospace Sciences Meeting
Country/TerritoryUnited States
Internet address


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