Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This book contributes to the fundamental understanding of the physical mechanisms that take place in pseudo turbulent particulate flows. In the present work we have considered the sedimentation of large numbers of spherical rigid particles in an initially quiescent flow field. We have performed direct numerical simulations employing an immersed boundary method for the representation of the fluid-solid interface. The results evidence that depending on the particle settling regime (i.e. Galileo number and particle-to-fluid density ratio) the particles may exhibit strong inhomogeneous spatial distribution. It is found that the particles are preferentially located in regions with downward fluid motion. The particles inside clusters experience larger settling velocities than the average. The flow in all flow cases is observed to exhibit characteristic features of pseudo-turbulence. The particle-induced flow field is further found to be highly anisotropic with dominant vertical components. The results indicate that, in the present flow configurations, the collective and mobility effects play significant role for the particle and fluid motion.

Partikel-Strömung --- Multiphasenströmungen --- DNS --- Suspensionsmultiphase and particle-laden flows --- immersed boundary method --- Immersed boundary

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Computer architecture. Operating systems --- DNS (domain name structure) --- BIND (Berkeley internet name domain) --- computerbeveiliging

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This work aims to study the flow through high-speed low-pressure turbines encountered under on- and off-design conditions in geared turbofans. DNS are performed on the Belgian tier-1 cluster Lucia using the numerical solver ArgoDG implementing the discontinuous Galerkin method. Mach numbers of 0.7, 0.9 and 0.95 are considered combined with a Reynolds number of 70,000. A free-stream turbulence intensity ranging between 2.8-3.0% at the blade is generated using a precursor turbulence injection method. The blade loading, the boundary layer, the wake behaviour as well as the separation and transition phenomena play key roles in flow physics. A direct comparison is performed with experimental data from the SPLEEN project and numerical data obtained with clean inlet conditions.
A close match with the experimental data is observed for blade loading and wake. In the subsonic case, a long separation bubble provoked by an adverse pressure gradient is observed at 61% of the suction side (SS). The flow reattaches before the trailing edge thanks to the flow transition enhanced by free-stream turbulence. In the transonic and the choked case, the shock spanning the flow passage considerably impacts the separation located approximately at 71% of the SS. The shock generates a strong compression followed by pressure recovery which first detaches the flow prematurely before its rapid reattachment. Throughout this separation bubble, the flow remains laminar even though an onset of transition is observed. The quasi-laminar nature impacts the
BL characteristics and induces a strong momentum defect. Furthermore, observed losses increase with Mach number.

Turbulence Injection --- LPT --- transonic --- DNS --- DGM --- separation --- transition --- shock --- Ingénierie, informatique & technologie > Ingénierie aérospatiale

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Long description: Biographical note: Markus Hengstler ist seit fast 20 Jahren in der IT tätig und arbeitet als Senior Systems Engineer insbesondere mit Exchange, Citrix und Windows Server. Er erlangte die höchste Zertifizierung im Fachgebiet Exchange, den Microsoft Certified Master und ist Microsoft Certified Trainer. Er gibt Kurse und schreibt für den Blog der Digicomp Academy AG.

Microsoft --- Business --- Office --- PowerShell --- SharePoint --- Outlook --- Pop --- DNS --- Mailbox --- Skype --- Backup --- Client --- IMAP --- Serverkonfiguration --- SMTP --- Windowws --- Microsoft Exchange server.

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Computer architecture. Operating systems --- 681.324 --- BIND --- DNS -Domain Name System --- Internet-applicaties --- Internet domain names. --- Internet domain names --- Domain names, Internet --- UNIX (Computer file) --- UNIX (Computer operating system) --- Names