We analyze the influence of microramp vortex generators (mVGs) on a canonical oblique shock wave/turbulent boundary-layer interaction (SBLI) in terms mean flow field and unsteady dynamics. The configuration our wall-resolved large-eddy simulations (LES) reproduces experiment Bo et al. [“Experimental investigation micro-ramp based wave turbulent control,” Phys. Fluids 24, 055110 (2012)]: rake mi...

What drives flow unsteadiness in the shock wave/turbulent boundary layer interaction? Two mechanisms are widely recognized to play a role this problem: upstream forcing and downstream feedback. In work, through combined use of system identification, spectral decomposition, linear stability analysis, we demonstrate that feedback, driven by traveling acoustic waves, is dominant mechanism behind l...

By properly considering the propagation dynamics of dipole field, we obtain full magnetic dipolar interaction between two quantum dipoles for general situations. With help Maxwell equation and corresponding Green function, this result applies boundary conditions, naturally unifies all terms permanent dipoles, resonant or non-resonant transition even counter-rotating altogether. In particular, s...

We consider a massless scalar field in 1+1 dimensions that satisfies a Robin boundary condition at a non-relativistic moving boundary. Using the perturbative approach introduced by Ford and Vilenkin, we compute the total force on the moving boundary. In contrast to what happens for the Dirichlet and Neumann boundary conditions, in addition to a dissipative part, the force acquires also a disper...

The theory of a massless two-dimensional scalar field with a periodic boundary interaction is considered. At a critical value of the period this system defines a conformal field theory and can be re-expressed in terms of free fermions, which provide a simple realization of a hidden SU(2) symmetry of the original theory. The partition function and the boundary S-matrix can be computed exactly as...