Unified formulation for URANS and LES in DxUNSp code

The aim of this work is to find a unified and efficient implementation of a LES turbulence model in an existing URANS CFD code, initially based on unsteady RANS equations with a k-ε turbulence model. This code has the capability to be developed for nonreacting/reacting multifluid flows in research applications. The paper intends to present mainly three aspects of this implementation for unstructured mesh based solvers, for high Reynolds compressible flows: the influence of the numerical reconstruction scheme on the results for compressible LES, the influence of the compressible SGS modeling and the efficient implementation of a wall-law based approach for complex geometry. The results will be presented for a test case (3D flow over a square cylinder at Reynolds = 22.000 [0]) and compared with experimental data and other simulations. Some details for the computational efficiency and implementation on parallel computer cluster at INCAS will also be presented [0]

Nicotinic Acid Adenine Dinucleotide Phosphate Potentiates Neurite Outgrowth

Ca2+ regulates a spectrum of cellular processes including many aspects of neuronal function. Ca2+-sensitive events such as neurite extension and axonal guidance are driven by Ca2+ signals that are precisely organized in both time and space. These complex cues result from both Ca2+ influx across the plasma membrane and the mobilization of intracellular Ca2+ stores. In the present study, using rat cortical neurons, we have examined the effects of the novel intracellular Ca 2+-mobilizing messenger nicotinic acid adenine dinucleotide phosphate (NAADP) on neurite length and cytosolic Ca2+ levels. We show that NAADP potentiates neurite extension in response to serum and nerve growth factor and stimulates increases in cytosolic Ca2+ from bafilomycin- sensitive Ca2+ stores. Simultaneous blockade of inositol trisphosphate and ryanodine receptors abolished the effects of NAADP on neurite length and reduced the magnitude of NAADP-mediated Ca2+ signals. This is the first report demonstrating functional NAADP receptors in a mammalian neuron. Interplay between NAADP receptors and more established intracellular Ca2+ channels may therefore play important signaling roles in the nervous system

Wind Tunnel Testing of Passive High-Lift Systems

This paper presents experimental results obtained with passive high lift systems using a combination of smart flap kinematics and vortex generators. A mid-scale 2.5D wind tunnel model based on DLR-F15 is tested in INCAS Subsonic Wind Tunnel, swept at 30 deg, incorporating the slat, 54 flap/VG/chord extension configurations and test matrix, developed by Dassault-Aviation. INCAS designed, manufactured and instrumented components to be added to the existing INCAS-F15 2D wind tunnel model. The test campaign was completed and results are presented

CFD Analysis for Industrial Applications using xGrid Environment

Relevant CFD computations are performed in a GRID environment in order to evaluate this technology as a reliable infrastructure for HPSC for complex industrial applications. Several aspects of this environment are presented, including the CFD solver platform based on DxUNSp code developed in INCAS, dedicated pre/postprocessing tools for partitioning and domain decomposition and use of automatic differentiation of source code for optimization problems. Access for users is provided, together with information on our mobile GRID client for access in xGRID, application network for HPSC in fluid mechanics and aerospace research

Advanced Aerodynamic Technologies for Future Green Regional Aircraft

Future Green Regional Aircraft (GRA) will operate over airports located in the neighborhood of densely populated areas, with high frequency of takeoff/ landing events and, hence, strongly contribute to community noise and gaseous emissions. These issues currently limit further growth of traffic operated by regional airliners which, in the next future, will have to face even more stringent environmental normative worldwide and therefore re-designed to incorporate advanced active aerodynamic technologies. The new concept behind GRA is based on several mainstream technologies: airframe low-noise (LN), aerodynamic load control (LC) and load alleviation (LA). These technologies integrate relevant concepts for hybrid and natural laminar flow (HLC/NLF) wing, active control of wing movables and aeroelastic tailoring for LC/LA functions, passive means (micro-riblets) for turbulent flow drag reduction, innovative gapless architectures (droop nose, morphing flap) beside conventional high-lift devices (HLDs), active flow control through synthetic jets, low-noise solutions applied to HLDs (liners, fences), and to fuselage-mounted main and nose landing gears (bay/doors acoustic treatments, fairings, wheels hub cap). The paper deals with the technological readiness level (TRL) assessment of the most promising technologies and overall integration in the new generation of GRA, as a highly optimized configuration able to meet requirements for FlighPath 2050

Numerical study of a particle-laden flow in a harsh environment testing facility

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