Turbulent Drag Reduction Using Anisotropic Permeable Substrates
Sign Up to like & getrecommendations! Published in 2018 at "Flow, Turbulence and Combustion"
DOI: 10.1007/s10494-018-9916-4
Abstract: The behaviour of turbulent flow over anisotropic permeable substrates is studied using linear stability analysis and direct numerical simulations (DNS). The flow within the permeable substrate is modelled using the Brinkman equation, which is solved… read more here.
Keywords: stability analysis; wall normal; permeable substrates; anisotropic permeable ... See more keywords
On the Measurement of Wall-Normal Velocity Derivative in a Turbulent Boundary Layer
Sign Up to like & getrecommendations! Published in 2019 at "Flow, Turbulence and Combustion"
DOI: 10.1007/s10494-019-00031-1
Abstract: The wall-normal velocity derivative of ∂u/∂y is measured in a turbulent boundary layer, down to 2 wall units from the wall, using two parallel hot-wires. The momentum-thickness- and friction-velocity-based Reynolds numbers are 1450 and 584,… read more here.
Keywords: velocity derivative; velocity; wall normal; normal velocity ... See more keywords
Experimental study on the dynamic characteristics of wall normal stresses during silo discharge
Sign Up to like & getrecommendations! Published in 2020 at "Powder Technology"
DOI: 10.1016/j.powtec.2020.01.023
Abstract: Abstract The characteristics and mechanisms of stress fluctuation are not fully understood, especially for the large fluctuation at the cylinder/hopper transition. In this paper, we performed wall normal stress tests in a laboratory-scale silo which… read more here.
Keywords: wall normal; characteristics wall; hopper; fluctuation ... See more keywords
Machine-learning-based feedback control for drag reduction in a turbulent channel flow
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2020.690
Abstract: Abstract One of the successful feedback controls for skin-friction drag reduction designed by Choi et al. (J. Fluid Mech., vol. 262, 1994, pp. 75–110), called ‘opposition control’, has a limitation in application because the sensors… read more here.
Keywords: turbulent channel; wall normal; wall; channel flow ... See more keywords
Large-scale turbulence structures in a laboratory-scale boundary layer under steady and gusty wind inflows
Sign Up to like & getrecommendations! Published in 2019 at "Scientific Reports"
DOI: 10.1038/s41598-019-45873-x
Abstract: Experiments on turbulence structures and features of a wind field under steady inflow and gusty wind inflows were implemented in a straight-through wind tunnel. Streamwise and wall-normal velocity components were measured using a streamline constant… read more here.
Keywords: wind; wall normal; gusty wind; streamwise ... See more keywords