Influence of local and adaptive mesh refinement on the tip vortex characteristics of a wing and propeller

Two different methods to obtain nearly grid independent solutions for tip vortex flow were tested for a wing and a propeller. A priory mesh refinement inside a tube with a helix shaped centre line worked quite well, reducing the grid dependency of the minimum pressure in the vortex core significantly but the accuracy still depends on the initial mesh. Better results were obtained with adaptive mesh refinement using the jump based estimator. Projection of new created nodes to the exact geometry is required to obtain high accuracy

Fermionic matter-wave quantum optics with cold-atom impurity models

Motivated by recent cold-atom realisations of matter-wave waveguide QED, we study simple fermionic impurity models and discuss fermionic analogues of several paradigmatic phenomena in quantum optics, including formation of non-trivial bound states, (matter-wave) emission dynamics, and collective dissipation. For a single impurity, we highlight interesting ground-state features, focusing in particular on real-space signatures of an emergent length scale associated with an impurity screening cloud. We also present novel non-Markovian many-body effects in the quench dynamics of single- and multiple-impurity systems, including fractional decay around the Fermi level and multi-excitation population trapping due to bound states in the continuum.Comment: 24 pages, 7 figures, comments welcom

Effectiveness of manual therapy for chronic tension-type headache: a pragmatic, randomised, clinical trial

To evaluate the effectiveness of manual therapy (MT) in participants with chronic tension-type headache (CTTH)