Browsing NTNU Open by Author "Hearst, R. Jason"
Now showing items 21-30 of 30
-
The significant impact of ribs and small-scale roughness on cylinder drag crisis
Skeide, Arne Kilvik; Bardal, Lars Morten; Oggiano, Luca; Hearst, R. Jason (Peer reviewed; Journal article, 2020)The impact of flow-normal ribs and small-scale surface roughness on the drag and vortex shedding of a circular cylinder was investigated. Three rib heights, four relative rib spacings and three different forms of microroughness ... -
Simultaneous skin friction and velocity measurements in high Reynolds number pipe and boundary layer flows
Baidya, Rio; Baars, W. J.; Zimmerman, Spencer; Samie, Milad; Hearst, R. Jason; Dogan, Eda; Mascotelli, Lucia; Zheng, X; Bellani, Gabriele; Talamelli, A.; Ganapathisubramani, Bharathram; Hutchins, Nicholas; Marusic, Ivan; Klewicki, Joe; Monty, Jason P (Book, 2019)Streamwise velocity and wall-shear stress are acquired simultaneously with a hot-wire and an array of azimuthal/spanwise-spaced skin friction sensors in large-scale pipe and boundary layer flow facilities at high Reynolds ... -
Spatial characteristics of a zero-pressure-gradient turbulent boundary layer in the presence of free-stream turbulence
Dogan, Eda; Hearst, R. Jason; Hanson, Ronald; Ganapathisubramani, Bharathram (Journal article; Peer reviewed, 2019)Particle image velocimetry (PIV) measurements are performed to examine the structural organization inside a turbulent boundary layer under the influence of free-stream turbulence (FST). In particular, streamwise-wall-normal ... -
The effect of active grid turbulence on the wingtip vortices and performance of a NACA-4412
Dehareng, Simon (Master thesis, 2023)The impact of freestream turbulence (FST) generated by an active turbulence grid (ATG) on the aerodynamic performance and behavior of a wingtip vortex in the near wake of a NACA-4412 airfoil was investigated using various ... -
The effect of active grid-generated freestream turbulence on an aeroelastic NACA4412 airfoil
Cantan, Jean Jacques Christian Georges (Master thesis, 2021)Aerodynamiske og strukturelle egenskaper til en NACA4412-bæreflate har blitt undersøkt eksperimentelt i den store lukkede vindtunnelen ved NTNU. Hensikten var å få innsikt i hvordan freestream-turbulens, som ble generert ... -
The effect of turbulence on oxygen uptake of water
Nore, Astri (Master thesis, 2022)Påvirkningen av turbulens på oksygenoverføringsraten mellom luft og vann undersøkes eksperimentelt. Dette blir gjort i en stor, resirkulerende vannkanal med et aktivt grid for å kontrollere turbulensen. Fire forskjellige ... -
The Mean Velocity of the Near-Field of a Lab-Scale Wind Turbine in Tailored Turbulent Shear Flows
Li, Leon; Hearst, R. Jason; Ganapathisubramani, Bharathram (Chapter, 2019)This study investigated the mean velocity of the near-field wake of a lab-scale wind turbine subjected to seven different incoming turbulent shear flows through particle image velocimetry. An active grid was used to generate ... -
The near-field of a lab-scale wind turbine in tailored turbulent shear flows
Li, Leon; Hearst, R. Jason; Ferreira, Manuel A.; Ganapathisubramani, Bharathram (Journal article; Peer reviewed, 2020)Real wind turbines experience a wide range of turbulent shear flows that naturally occur within the atmospheric boundary layer, however, these are often difficult to simulate in experiments. An active grid was used to ... -
The Use of Active Grids in Experimental Facilities
Hearst, R. Jason (Chapter, 2019)Active grids allow for the turbulence in experimental facilities to be tailored through a broad range of turbulence intensities and Reynolds numbers. This work provides an overview of the active grids that presently exist ... -
Time evolution of uniform moment zones in a turbulent boundary layer
Laskari, Angeliki; de Kat, Roeland; Hearst, R. Jason; Ganapathisubramani, Bharathram (Journal article; Peer reviewed, 2018)Time-resolved planar particle image velocimetry (PIV) was used to analyse the structuring of a turbulent boundary layer into uniform momentum zones (UMZs). The instantaneous peak detection method employed by Adrian et al. ...