of the unresolved scales on resolved scales. A computational grid consisting 12 million points was used in present simulation. Mean flow results obtained our simulation are found to be excellent agreement with available experimental data jets at similar conditions. Furthermore, near field provided by LES is coupled Ffowcs Williams-Hawkings method compute far noise. Far aeroacoustics also presented and comparisons made another study.

Wall-resolved large-eddy simulation of a model turbulent flow involving favorable and adverse pressure gradients, imposed by surface curvature wall-mounted hump, is performed for spanwise-periodic computational domain. The acceleration over the front portion hump strong enough to exceed relaminarization criterion Narasimha Sreenivasan (“Relaminarization in Highly Accelerated Turbulent Boundary Layers,” Journal Fluid Mechanics, Vol. 61, No. 3, 1973, pp. 417–447) but only relatively short...

Wall-resolved implicit large-eddy simulations based on spatial filtering are performed for shock-induced flow separation over an axisymmetric bump at a Mach number of 0.875 and chord-based Reynolds 2.763 million. The incoming boundary layer has momentum thickness 6600 1.5 chords upstream the bump. calculations, which employ up to 24 billion grid points, simulate experimental model Bachalo Johnson ("Transonic, Turbulent Boundary-Layer Separation Generated Axisymmetric Flow Model," AIAA...

We report results from the simulation of a moderate Reynolds number cold jet flow exhausting chevron nozzle with six symmetric chevrons that have an approximately 18-degree penetration angle. The inside geometry and free outside are computed simultaneously by high-order accurate, multi-block, large eddy code overset grid capability. is performed on 400 million points using 2048 processor cores in parallel. main emphasis to compute maximum detail possible accurately capture physical processes...

O-band InAs/GaAs Quantum Dot edge-emitting lasers are integrated onto a number of waveguiding platforms using micro-transfer printing. These deep recesses in 220 nm Si, 3 µm Si and 300 SiN waveguide circuits. The processing technology to achieve release high-yield accurate transfer laser coupons up 2.4 mm long < 5 thick the target substrates is described. At 85 mA, coupled powers 1.0 mW 0.95 measured after out-coupling from SOI waveguides, respectively while 1.7 total power was waveguide.

We examined a set of 21 core journals in the field library and information science (LIS) from 1980–1999 for articles with either principal or co-authors developing countries (DCs) formerly socialist Eastern European (EECs). found that only 826 (7·9%) total 10 400 published are DCs EECs. The numbers authors China, Saudi Arabia, Turkey, Botswana, Ghana, Kuwait, Taiwan considerably increased those India, Nigeria, Pakistan, Brazil, Poland decreased. Using bibliometric indicator we among...

This paper demonstrates an application of computational aeroacoustics to the prediction noise generated by a round nozzle jet flow. In this study, internal flow and free outside are computed simultaneously high-order accurate, multi-block, large-eddy simulation (LES) code with overset grid capability. To simulate field its radiated noise, we solve governing equations on approximately 370 million points using high-fidelity numerical schemes developed for aeroacoustics. Projection near-field...

This paper reports the findings from a study that applies wall-resolved large-eddy simulation to investigate flow separation over NASA wall-mounted hump geometry. Despite its conceptually simple configuration, this benchmark problem has proven be challenging test case for various turbulence methods have attempted predict arising adverse pressure gradient on aft region of hump. The momentum-thickness Reynolds number incoming boundary layer value is near upper limit achieved by recent direct...

Gölbaşı Havzası, Pazarcık ve Erkenek Segmentlerinin birleştiği alanda yer alan tektonik kökenli bir havzadır. Çalışmanın amacı, Kahramanmaraş depremlerinin Havzası’nda meydana getirdiği yüzey deformasyonlarını bunların fiziki beşerî yapılar üzerindeki etkilerini incelemektir. Arazi çalışmaları kapsamında çalışma sahasındaki fayın 14 km’si takip edilerek haritalandırılmıştır. Ayrıca deprem etkilerinin yerleşmelere göre dağılışı incelenmiştir. Verilerin görselleştirilmesinde ArcGIS 10.3.1...

I surveyed the social sciences journal literature for decade period 1987-1996 looking papers with authors, or at least one co-author giving an address from institution in Turkey. The number of such had nearly tripled 1987 to 1996. found that are scattered into 341 journals and almost third all went nine journals, each which contained average a Turkish paper per year. Only two these on archaeology anthropology, happened be high citation impact.Psychology psychiatry, combined business...

Kullanım kolaylığı ve sağladığı birçok avantaj İnsansız Hava Araçlarının (İHA) askeri, sivil (hobi, ticari) bilimsel amaçlı kullanımını hızla arttırmaktadır. İçinde pilotu yolcusu olmayan, sadece amaca uygun ekipman taşıyarak görevini yerine getiren İHA kullanımı, alanda olduğu gibi jeomorfoloji çalışmalarında da giderek yaygınlaşmaktadır. kullanımı araziyi havadan çeşitli açılardan fotoğraflama ile sınırlı değildir. Gelişen teknolojisi sayesinde haritalama, sinematografi, ortofoto sayısal...

the model’ s sensitivity by applying it to LES of turbulent jets and analyzing results two simulations obtained with slightly direrent values model constant. The Smagorinsky is known be sensitive constant; however, our show explicitly how strongly mean e ow properties are value More detailed can found in Ref. 5. Governing Equations

This study is focused on developing a Computational Aeroacoustics (CAA) methodology that couples the near field unsteady flow data computed by 3-D Large Eddy Simulation (LES) code with various integral acoustic formulations for far noise prediction of turbulent jets. The LES employs state-of-the-art numerical schemes and localized version dynamic Smagorinsky subgrid-scale (SGS) model. also has capability to turn off SGS model treat spatial filter needed stability as an implicit Noise...

Introduction V ISBAL and Rizzetta1 Visbal et al.2 have recently performed large-eddy simulation (LES) calculations of turbulent channel flow compressible isotropic turbulence decay without using any explicit subgrid-scale (SGS) model. In those simulations, spatial filtering was treated as an implicit SGS They also showed that use model in simulations did not produce results superior to obtained employing Bogey Bailly3 LES for jet flows by only. Moreover, they brought up the issue effects...

One of the major challenges in computational jet aeroacousties is accurate modeling and prediction acoustic fields to reduce control noise. Surface integral methods (e.g., Kirchhoff method Ffowcs Williams-Hawkings method) can be used aeroacoustics extend near-field fluid dynamics results far field. The surface efficiently accurately predict aerodynamically generated noise provided surrounds entire source region. However, for prediction, shear mean flow exists outside that causes refraction....

It is important to determine the water quality of creeks in Lake Sapanca basin since it used for drinking supply. For this purpose, environmental parameters and diatom assemblages as biological components were investigated ecological status eight with monthly intervals between March 2015 February 2016. During studied period, 19 taxa increased their relative abundance higher than 30% at least one sample showed a different seasonal pattern. Main nutrients [(nitrate-nitrogen, orthophosphate,...