The boundary layer development and traveling wave mechanisms during flapping of a flexible foil

Heat transfer performance of flag vortex generators in rectangular channels

“…Indeed, the flag flutter problem was also investigated by incorporating viscous effects by solving the Navier-Stokes equations [37,50,[86][87][88][89][90][91][92][93][94]. Although Gibbs et al [62] argued that inviscid theories were sufficient to model flag flutter, the viscosity was demonstrated to affect flag instability [45,46,63].…”

Combined interface boundary condition method for fluid–structure interaction: Some improvements and extensions

“…From the viewpoint of numerical method, it is widely acceptable to gain reasonable results at the expense of the mesh. The very refined mesh is required to resolve the boundary layer near the bluff body, if we center on the precise representation of the flow physics (Bourlet et al, 2015). The time step is set as (He, 2015c;Wall and Ramm, 1998;Teixeira and Awruch, 2005;Dettmer and Perić, 2006;Liew et al, 2007;Wood et al, 2008;Braun and Awruch, 2009;Habchi et al, 2013).…”

Thin and sharp edges bodies-fluid interaction simulation using cut-cell immersed boundary method

“…In cases involving thin objects, the intricacies are difficult to capture, which leads to an inadequate understanding of the nature of the relationship between a solid and a surrounding fluid (Liang, Wei, Lu, & Qin, 2017;Mo, Lien, Zhang, & Cronin, 2018;Mou, He, Zhao, & Chau, In FSI problems, the flow characteristics within proximity of the surface of thin objects are determined by estimating the pressure and velocities of the flow in the boundary layer. Re-meshing is required whenever the thin object becomes displaced or deformed, which will increase the computational cost (Bourlet, Gurugubelli, & Jaiman, 2015;Fujisawa & Asada, 2016;Liu, Zhao, Hu, Goman, & Li, 2013;Yang, Yu, Krane, & Zhang, 2018). In this regard, fixed Cartesian mesh schemes are typically implemented for the discretization of the equations of fluid dynamics in order to estimate the flow characteristics of arbitrarily thin objects because of their simplicity and lower computational cost.…”