Investigation of Aeroelastic Stability in a Solar Tracker: Scale-Model Study and CFD Analysis
2026 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
Student thesisAlternative title
Undersökning av aeroelastisk stabilitet i en solföljare: skalmodellstudie och CFD-analys (Swedish)
Abstract [en]
Wind loading can induce large unsteady torques and aeroelastic instabilities in ground-mounted photovoltaic trackers. This thesis investigates the aeroelastic stability and cross-scale similarity of a wind-adaptive solar-panel concept developed by VAJA AB. A coupled modeling framework is established that links incompressible CFD-derived aerodynamic forces and hinge moments to low-order rigid-body structural dynamics, enabling systematic analysis of mean loading, dynamic response regimes, and similarity between full-scale and reduced-scale configurations. Aerodynamic forcing is obtained from transient OpenFOAM simulations using an incompressible URANS formulation with the Menter k-ω SST turbulence model, while structural response is represented using both a pitch-only model and a coupled pitch–plunge model to capture support flexibility and inertial coupling. Cross-scale similarity is evaluated in the time domain using reduced-time normalization based on dominant frequency, phase alignment, correlation metrics, and an affine gain/offset mapping to compare waveform structure across scales.
Abstract [sv]
Denna avhandling undersöker aeroelastisk stabilitet och likformighet mellan skalor för ett vindanpassat solpanelkoncept utvecklat av VAJA AB. Ett kopplat modelleringsramverk etableras som länkar aerodynamiska krafter och gångjärnsmoment från inkompressibel CFD till lågodriga styv-kroppsmodeller, vilket möjliggör en systematisk analys av medellaster, dynamiska responsregimer samt likformighet mellan fullskalig och nedskalad konfiguration. De aerodynamiska lasterna erhålls från transienta OpenFOAM-simuleringar med en inkompressibel URANS-formulering och turbulensmodellen Menter k-ω SST, medan den strukturella responsen beskrivs med både en pitch-modell och en kopplad pitch–plunge-modell för att fånga stödflexibilitet och inertikoppling. Likformighet mellan skalor utvärderas i tidsdomänen med reducerad tidsnormalisering baserad på dominerande frekvens, fasjustering, korrelationsmått och en affin gain/offset-mappning för att jämföra vågformsstrukturen mellan skalor.
Place, publisher, year, edition, pages
2026.
Series
TRITA-SCI-GRU ; 2026:046
Keywords [en]
solar tracker, wind-adaptive panel, wind loads, aeroelastic stability, flutter, pitch–plunge motion, rigid-body dynamics, URANS, OpenFOAM, scaling laws, similarity analysis, scale-model study
Keywords [sv]
solföljare, vindanpassad panel, vindlaster, aeroelastisk stabilitet, fladder, pitch–plunge-rörelse, styvkroppsdynamik, URANS, OpenFOAM, skalningslagar, likformighetsanalys, skalmodellstudie
National Category
Vehicle and Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-382588OAI: oai:DiVA.org:kth-382588DiVA, id: diva2:2063307
External cooperation
VAJA AB
Subject / course
Aeronautical Engineering
Educational program
Master of Science in Engineering - Vehicle Engineering
Supervisors
Examiners
2026-05-292026-05-282026-05-29Bibliographically approved