Stability assessment on sinusoidal roughness elements for crossflow-transition control

2021 ◽  
Vol 33 (3) ◽  
pp. 034112
Author(s):  
Yuki Ide ◽  
Makoto Hirota ◽  
Naoko Tokugawa
Keyword(s):  
Stability Assessment ◽  
Transition Control ◽  
Roughness Elements

Control of a swept-wing boundary layer using ring-type plasma actuators

2018 ◽  
Vol 844 ◽  
pp. 36-60 ◽  
Author(s):  
Nima Shahriari ◽  
Matthias R. Kollert ◽  
Ardeshir Hanifi
Keyword(s):  
Boundary Layer ◽  
Cross Flow ◽  
Plasma Actuators ◽  
Swept Wing ◽  
Ring Type ◽  
Transition Control ◽  
Turbulent Transition ◽  
Roughness Elements ◽  
Order Of Magnitude ◽  
Induced Velocity

Application of ring-type plasma actuators for control of laminar–turbulent transition in a swept-wing boundary layer is investigated thorough direct numerical simulations. These actuators induce a wall-normal jet in the boundary layer and can act as virtual roughness elements. The flow configuration resembles experiments by Kim et al. (2016 Technical Report. BUTERFLI Project TR D3.19, http://eprints.nottingham.ac.uk/id/eprint/46529). The actuators are modelled by the volume forces computed from the experimentally measured induced velocity field at the quiescent air condition. Stationary and travelling cross-flow vortices are triggered in the simulations by means of surface roughness and random unsteady perturbations. Interaction of vortices generated by actuators with these perturbations is investigated in detail. It is found that, for successful transition control, the power of the actuators should be increased to generate jet velocities that are one order of magnitude higher than those used in the experiments by Kim et al. (2016) mentioned above.

Geomaterial Characterization and Stability Assessment of Hydraulic Fill Dams

2021 ◽  
Vol 33 (2) ◽  
pp. 04020446
Author(s):  
Sayantan Chakraborty ◽  
Tejo V. Bheemasetti ◽  
Anand J. Puppala ◽  
Jasaswee T. Das ◽  
Santiago R. Caballero O
Keyword(s):  
Stability Assessment ◽  
Hydraulic Fill
Sign in / Sign up

Export Citation Format

Share Document