Learn More
We present different simulations of primary atomization using an adaptive Volume-of-Fluid method based on octree meshes. The use of accurate numerical schemes for mesh adaptation, Volume-of-Fluid advection and balanced force surface tension calculation implemented in Gerris, the code used to perform the simulations included in this work, has made possible(More)
We perform numerical simulations of two-phase liquid-gas sheared layers, with the objective of studying atomization. The Navier-Stokes equations for two-dimensional incompressible flow are solved in a periodic domain. A Volume of Fluid (VOF) method is used to track the interface. The density ratio is kept around 10. The calculations show good agreement with(More)
OBJECTIVES The noradrenergic innervation of lymphoid organs controls several immune cell functions and local blood perfusion. Considering that cell and antigen uptake depend on the blood supply to lymphoid organs, the hypothesis was tested that feedback signals from activated immune cells control sympathetic vasomotor activity. METHODS We determined the(More)
PURPOSE To evaluate the impact of beam delivery and beam shaping on corneal profiles after myopic excimer laser photorefractive keratectomy (PRK). SETTING Department of Ophthalmology, Charité-Campus Virchow Hospital, Humboldt University of Berlin, Berlin, Germany. METHODS Standard myopic 193 nm excimer laser PRK of -3.0 diopters (D) and -6.0 D was(More)
We investigate the linear and non-linear evolution of perturbations in a magnetohydro-dynamic channel flow with electrically insulating channel walls in which a strong magnetic field possesses an orientation orthogonal to the stream but parallel to the walls. Linear optimal perturbations and their maximum amplifications over finite time intervals are(More)
We predict a novel flow regime in liquid metals under the influence of a magnetic field. It is characterized by long periods of nearly steady, two-dimensional flow interrupted by violent three-dimensional bursts. Our prediction has been obtained from direct numerical simulations in a channel geometry at low magnetic Reynolds number and translates into(More)
Permission to make digital or hard copies of portions of this work for personal or classroom use is granted provided that the copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise requires prior specific permission by the publisher mentioned above. A(More)
Permission to make digital or hard copies of portions of this work for personal or classroom use is granted provided that the copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise requires prior specific permission by the publisher mentioned above. We(More)