{"refrec":{"BRefID":338191,"RR":"<b>Rezaeiha, A.; Kalkman, I.; Blocken, B.</b> (2017). CFD simulation of a vertical axis wind turbine operating at a moderate tip speed ratio: guidelines for minimum domain size and azimuthal increment. <i>Renew. Energy 107</i>: 373-385. <a href=\"https://hdl.handle.net/10.1016/j.renene.2017.02.006\" target=\"_blank\">https://hdl.handle.net/10.1016/j.renene.2017.02.006</a>","BEntID":334816,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Renew. Energy 107</i>: 373-385. <a href=\"https://hdl.handle.net/10.1016/j.renene.2017.02.006\" target=\"_blank\">https://hdl.handle.net/10.1016/j.renene.2017.02.006</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Rezaeiha, A.; Kalkman, I.; Blocken, B.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Rezaeiha, A.; Kalkman, I.; Blocken, B.","Englishabstract":"Accurate prediction of the performance of a vertical-axis wind turbine (VAWT) using Computational Fluid Dynamics (CFD) simulation requires a domain size that is large enough to minimize the effects of blockage and uncertainties in the boundary conditions on the results. It also requires the employment of a sufficiently fine azimuthal increment (dθ) combined with a grid size at which essential flow characteristics can be accurately resolved. The current study systematically investigates the effect of the domain size and azimuthal increment on the performance of a 2-bladed VAWT operating at a moderate tip speed ratio of 4.5 using 2-dimensional and 2.5-dimensional simulations with the unsteady Reynolds-averaged Navier-Stokes (URANS). The grid dependence of the results is studied using three systematically refined grids. The turbine has a low solidity of 0.12 and a swept area of 1 m<sup>2</sup>. Refining dθ from 10.0° to 0.5° results in a significant (≈43%) increase in the predicted power coefficient (CP) while the effect is negligible (≈0.25%) with further refinement from 0.5° to 0.05° at the given λ. Furthermore, a distance from the turbine center to the domain inlet and outlet of 10D (D: diameter of turbine) each, a domain width of 20D and a diameter of the rotating core of 1.5D are found to be safe choices to minimize the effects of blockage and uncertainty in the boundary conditions on the results.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"CFD simulation of a vertical axis wind turbine operating at a moderate tip speed ratio: guidelines for minimum domain size and azimuthal increment","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-20 01:32:44.312667","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Vertical axis wind turbine (VAWT); CFD; Guideline; Domain size; Azimuthal increment; Number of revolutions","OtherDescriptors":null,"Notes":null,"AnaPub":2017,"MonPub":null,"DateUpdate":"2021-05-26","DateCreate":"2021-05-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000396946900033","VABBcode":null,"OpenAcc":1,"Handle":"10.1016/j.renene.2017.02.006"},"refs":null,"anarec":{"AnaID":338191,"PubliDate":2017,"Pagination":"373-385","XtraPublOfAnaID":null,"ISBN":null,"Volume":"107","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":213933,"SerRR":"Renewable Energy. 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