Bulletin of the American Physical Society
77th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 24–26, 2024; Salt Lake City, Utah
Session J36: Turbulent Boundary Layers II |
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Chair: Hassan Nagib, Illinois Institute of Technology Room: 355 B |
Sunday, November 24, 2024 5:50PM - 6:03PM |
J36.00001: Abstract Withdrawn
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Sunday, November 24, 2024 6:03PM - 6:16PM |
J36.00002: Turbulence-resolving integral simulation for wall-bounded flows Tanner Ragan, Mark Warnecke, Perry L Johnson Integral methods for studying and predicting turbulent boundary layers were typically based on the Reynolds-averaged equations. This talk introduces a moment-of-momentum approach for simulating instantaneous integral equations for turbulent wall-bounded flows by resolving the unsteady dynamics of large and very-large scale motions on a two-dimensional wall-parallel grid. Turbulence-resolving integral simulations (TRIS) are performed for an open-channel flow configuration with relatively primitive closure approximations. Direct numerical simulations (DNS) are used to evaluate the performance of the TRIS models and assess potential improvements. |
Sunday, November 24, 2024 6:16PM - 6:29PM |
J36.00003: The influence of a cylinder placed within the logarithmic region of a turbulent boundary layer Raphael Ribeiro, Ellen Kathryn Longmire, Melissa A Green Flow physics in the wake of cylinders positioned within the logarithmic region of a turbulent boundary layer are investigated using planar PIV in a water channel at a friction Reynolds number of 1320. Most previous studies focus on cylinders mounted perpendicular to surfaces or outside of the boundary layer, but in our experiments the cylinders are located parallel to the wall and oriented across the freestream. Instantaneous and averaged velocity fields are used to discuss the impact of cylinder diameter (D) and the gap between the cylinder and the wall (G) relative to the boundary layer thickness (δ). The range of D and G are smaller than most examples in the literature, with 0.01 < D/δ < 0.1 and G/δ < 0.2. Regardless of diameter, the characteristics of the boundary layer are changed significantly by the cylinder wake. Larger diameter cylinders (D/δ ~ 0.1) generate a wake coherent over a downstream distance longer than δ, while smaller diameter cylinders (D/δ ~ 0.01) produce a narrower and weaker wake. Results facilitate understanding how an obstacle of specific size affects existing turbulence characteristics and organization within the boundary layer in an instantaneous and time-averaged sense. |
Sunday, November 24, 2024 6:29PM - 6:42PM |
J36.00004: Restricted Nonlinear Large Eddy Simulations of Turbulent Boundary Layers Alexandra Colette Risha, Benjamin A Minnick, Dennice F Gayme This work employs the restricted nonlinear wall-resolved large eddy simulation (RNL-WRLES) framework to investigate moderate Reynolds number temporally developing boundary layers over a moving plate. RNL-LES models have previously reproduced low order statistics and structural features of wall-bounded turbulent flows in a simplified setting comprising a streamwise averaged mean flow interacting with a small number of streamwise varying modes. This work demonstrates that a similar reduced order setting provides good predictions of low order statistics and integral quantities such as skin friction coefficient and shape factor for temporally developing boundary layers. Varying the model parametrization provides insight into momentum transfer within the flow. The temporally developing turbulent boundary layers studied compare well with spatially developing boundary layers suggesting this reduced-order model can help better understand temporal evolution, despite limited streamwise scales, of the flow. |
Sunday, November 24, 2024 6:42PM - 6:55PM |
J36.00005: What can anisotropy tell us about the nature of atmospheric boundary layer flows Ivana Stiperski, Samuele Mosso, Marc Calaf, Gabriel G Katul Anisotropy is one of the fundamental characteristics of all turbulent flows in nature, engineering, and technology. At large scales, turbulence rarely attains an energy state that is equipartitioned between the three velocity components or a state where turbulent stresses disappear. This deviation from isotropy underscores turbulence's essential role in promoting momentum transfer. |
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