Sabet Seraj

Sabet Seraj
National Renewable Energy Laboratory | NREL

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12
Publications
6,129
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90
Citations

Publications

Publications (12)
Preprint
Full-text available
Ducted hydrokinetic turbines enhance energy-harvesting efficiency by better conditioning the flow to the blades, which may yield higher power output than conventional freestream turbines for the same reference area. In this work, we present a ducted hydrokinetic turbine design obtained by simultaneously optimizing the duct, blade, and hub geometrie...
Article
Full-text available
Geometry parameterization is a key challenge in shape optimization. Parameterizations must accurately capture the design intent and perform well in optimization. In multidisciplinary design optimization (MDO), the parameterization must additionally represent the shape consistently across each discipline. pyGeo is a geometry package for three-dimens...
Article
Full-text available
Aircraft aerodynamic design often involves evaluating flow conditions that span low subsonic to transonic or even supersonic Mach numbers. Compressible flow solvers are a natural choice for such design problems, but these solvers suffer from reduced accuracy and efficiency at low Mach numbers. In addition, simulations with supersonic conditions can...
Conference Paper
Full-text available
Three-surface configurations offer theoretical drag benefits over two-surface configurations, but the literature is unclear on what is the best configuration for a supersonic aircraft. This work uses trim-constrained drag minimization to compare the trim drag for three-surface, canard, and conventional variants of a supersonic transport aircraft. W...
Conference Paper
Full-text available
Computational fluid dynamics (CFD) has become a vital tool for aerospace engineers. The ability to rapidly assess the performance of a design without a wind tunnel experiment or flight test has greatly increased the rate at which engineers can iterate on a design. Despite CFD's widespread adoption, its automated use remains challenging. One challen...
Conference Paper
Full-text available
The aerodynamic design of aircraft often involves evaluating flow conditions that span low subsonic to transonic, or even supersonic Mach numbers. Compressible flow solvers are a natural choice for such design problems, but these solvers encounter reduced accuracy and efficiency at low Mach numbers. In addition, simulations with supersonic conditio...
Article
Full-text available
Ensuring the safe operation of new supersonic transport aircraft requires understanding their stability during takeoff and landing. These phases involve flying at subsonic speeds and high angles of attack, where the aerodynamics are characterized by unsteady vortical flow. This work assesses the accuracy of Reynolds-averaged Navier-Stokes (RANS) an...
Conference Paper
Full-text available
Designing supersonic transport aircraft requires accounting for performance and stability and high-speed and low-speed conditions. Previous work demonstrated that there is a trade-off between high-speed performance and low-speed stability. Numerical optimization presents the opportunity to obtain the best high-speed performance while enforcing stab...
Conference Paper
Full-text available
View Video Presentation: https://doi.org/10.2514/6.2021-2612.vid Ensuring the safe operation of new supersonic transport aircraft requires understanding their stability during takeoff and landing. These phases involve flying at subsonic speeds and high angles of attack, where the aerodynamics are characterized by unsteady vortical flow. In this wor...
Conference Paper
Two coupling schemes for fluid-structure interaction using the OpenFOAM structural solver sixDoF Rigid Body Motion are developed. The first scheme is developed by modifying the baseline leapfrog weak coupling scheme to minimize the lag between the fluid and structural solvers. The second is a strong coupling scheme based on the Crank-Nicolson metho...

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