## Inverse Design of Single- and Multi-Rotor Horizontal Axis Wind Turbine Blades Using Computational Fluid Dynamics

 dc.contributor.author Moghadassian, Behnam dc.contributor.author Sharma, Anupam dc.contributor.author Sharma, Anupam dc.contributor.department Aerospace Engineering dc.date 2020-12-22T04:26:06.000 dc.date.accessioned 2021-02-24T18:29:25Z dc.date.available 2021-02-24T18:29:25Z dc.date.copyright Mon Jan 01 00:00:00 UTC 2018 dc.date.issued 2018-04-01 dc.description.abstract

A method for inverse design of horizontal axis wind turbines (HAWTs) is presented in this paper. The direct solver for aerodynamic analysis solves the Reynolds-averaged Navier–Stokes (RANS) equations, where the effect of the turbine rotor is modeled as momentum sources using the actuator disk model (ADM); this approach is referred to as RANS/ADM. The inverse problem is posed as follows: for a given selection of airfoils, the objective is to find the blade geometry (described as blade twist and chord distributions) which realizes the desired turbine aerodynamic performance at the design point; the desired performance is prescribed as angle of attack (α) and axial induction factor (a) distributions along the blade. An iterative approach is used. An initial estimate of blade geometry is used with the direct solver (RANS/ADM) to obtain α and a. The differences between the calculated and desired values of α and a are computed and a new estimate for the blade geometry (chord and twist) is obtained via nonlinear least squares regression using the trust-region-reflective (TRF) method. This procedure is continued until the difference between the calculated and the desired values is within acceptable tolerance. The method is demonstrated for conventional, single-rotor HAWTs and then extended to multirotor, specifically dual-rotor wind turbines (DRWT). The TRF method is also compared with the multidimensional Newton iteration method and found to provide better convergence when constraints are imposed in blade design, although faster convergence is obtained with the Newton method for unconstrained optimization.

dc.description.comments

This is a manuscript of an article published as Moghadassian, Behnam, and Anupam Sharma. "Inverse design of single-and multi-rotor horizontal axis wind turbine blades using computational fluid dynamics." Journal of Solar Energy Engineering 140, no. 2 (2018): 021003. DOI: 10.1115/1.4038811. Posted with permission.

dc.format.mimetype application/pdf dc.identifier archive/lib.dr.iastate.edu/aere_pubs/176/ dc.identifier.articleid 1177 dc.identifier.contextkey 20747959 dc.identifier.s3bucket isulib-bepress-aws-west dc.identifier.submissionpath aere_pubs/176 dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/93029 dc.language.iso en dc.source.bitstream archive/lib.dr.iastate.edu/aere_pubs/176/0-SharmaAnupam_PermGrant_InverseDesign_ASME.pdf|||Fri Jan 14 21:26:10 UTC 2022 dc.source.bitstream archive/lib.dr.iastate.edu/aere_pubs/176/2018_SharmaAnupam_InverseDesignSingle.pdf|||Fri Jan 14 21:26:12 UTC 2022 dc.source.uri 10.1115/1.4038811 dc.subject.disciplines Aerodynamics and Fluid Mechanics dc.subject.disciplines Aerospace Engineering dc.subject.disciplines Computational Engineering dc.subject.keywords Wind dc.subject.keywords Wind turbine dc.title Inverse Design of Single- and Multi-Rotor Horizontal Axis Wind Turbine Blades Using Computational Fluid Dynamics dc.type article dc.type.genre article dspace.entity.type Publication relation.isAuthorOfPublication 9797e35d-08ee-41c7-8982-c83e6db2ed8e relation.isOrgUnitOfPublication 047b23ca-7bd7-4194-b084-c4181d33d95d
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