Direct numerical simulation is used to study the effect of crossflow on the dynamics, entrainment and mixing characteristics of vortex rings issuing from a circular nozzle. Three distinct regimes exist, depending on the velocity ratio (ratio of the average nozzle exit velocity to free-stream crossflow velocity) and stroke ratio (ratio of stroke length to nozzle exit diameter). Coherent vortex r...

Transient phenomena and vortex structures throughout the mold are simulated using a lattice Boltzmann method (LBM) coupled with large eddy simulation (LES) free surface model under steady operating conditions. The accuracy of LBM-LES has been verified by comparing velocities published experimental values. current work focuses on evolution structure in internal flow inside submerged entry nozzle...

An experimental investigation of the primary breakup of round nonturbulent liquid jets in gaseous crossflow is described. Pulsed shadowgraph and holograph observations were made to determine the following breakup properties: primary breakup regimes, conditions required for the onset of ligament and drop formation, ligament and drop sizes along the liquid surface, drop velocities after breakup, ...

Today companies outsource part of the service provisioning to other companies that are not part of their core competence. Companies can use current workflow management systems to control the progress of the service process within one organisation. However, with business-to-business e-commerce, service processes extend beyond organisational boundaries and the workflow management paradigm should ...

This paper addresses recent developments in model-reduction techniques applicable to fluid flows. The main goal is to obtain low-order models tractable enough to be used for analysis and design of feedback laws for flow control, while retaining the essential physics. We first give a brief overview of several model reduction techniques, including Proper Orthogonal Decomposition [3], balanced tru...

An unsteady numerical simulation method was used in order to explore more efficient atomization methods for liquid fuel scramjet combustors and study the influence of different shock wave incident positions on characteristics kerosene crossflow. The wedge compression surface generate wave, position jet controlled by changing angle surface. inlet Mach number 2.01; total temperature 300 K, moment...