Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"k-&omega"”.
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The current-voltage characteristics of linear chains of submicron Josephson tunnel junctions
… universal sheet resistance threshold of 6.4 k$\Omega$/square, below which all films become superconducting with decreasing temperature, and above which all films become insulating with decreasing temperature. At the critical sheet resistance of 6.4 k$\Omega$/square, the conductance of the …
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Gas-liquid simulation of an airlift bubble column reactor
… the K-Epsilon model, RNG K-Epsilon model and K-Omega model. This process occurs under atmospheric pressure. The volume fraction of model is described the behavior of bubble which is represented by the parameters of gas hold up, contact surface area and gas superficial velocity. The simulation …
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Flexible and stretchable tactile sensing skins using microwave transmission lines and piezoresistive rubber
… showed a sensitivity of greater than 2.3 k[omega] per degree with a 230 k[omega] resting resistance and the pressure sensor showed a sensitivity of 253 [omega] per kPa with a resting resistance of 97 k[omega]. However, the sensors showed hysteresis, poor repeatability, and had a slow …
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Deep inelastic scattering by quantum liquids
… scaling of the dynamic structure function S(k,$\omega$) at large k and $\omega$ have played a dominant role in the analysis of the deep inelastic neutron scattering by quantum liquids. These concepts are reviewed along with the prevalent approximations to treat final state interactions neglected …
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Cortical recording with conducting polymer electrodes
… saline. The initial impedance was as low as 70 k[omega], but the electrode impedance increased by a factor of 10 when immersed in saline over 370 hours. This conducting polymer microwire electrode was implanted in a rodent brain and successfully used to record neuronal action potentials.
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Simulation of liquid induced annulus wall boundary layer in a pipe flow, with dense net of jet cross flows
… pressure based Navier-Stokes equation and SST (k-omega) turbulence model. The effect of various boundary conditions on the annulus development was analysed. The jet streams‘ hole diameter and distribution density and core flow‘s velocity and density. Results of the simulations supported the …
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Optimal Dirichlet boundary control problems of high-lift configurations with control and integral state constraints
… den Navier-Stokes Gleichungen noch auf einem k-omega-Wilcox98 Turbulenzmodell, welches zu einem riesigen Rechenaufwand führt. Zur Lösung dieses Problems diskutieren wir eine Modellreduktion und ein reduced-order model (ROM), indem wir ein kleines System von gewöhnlichen Differentialgleichungen …
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Numerical Simulation of a Cryogenic Spray
… turbulence in the flow is captured by the k-omega SST model. Simulations performed over a wide range of nozzle inlet pressure suggest that the spray cone angle tends to remain constant. In contrast, the diameter of droplets along the centerline of the spray reduces significantly. Finally, it …
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Algorithms and lower bounds for sparse recovery
… - xsII2 with probability at least 1 - k-[omega](1). The recovery takes O(k) time. While interesting in its own right, this primitive also has a number of applications. For example, we can: * Improve the sparse recovery of Zipfian distributions O(k log n) measurements from a 1 + [epsilon] …
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Middle infrared beam-steering using liquid crystals for spatial light modulation
… conductor, with a sheet resistance $ < 1 $k$ \Omega / \square $ and an optical transmission $ > 97 \% $ in the frequency band of interest. Liquid crystal BL-037 was found to have a birefringence of 0.23 in the middle infrared, where absorption bands exist between 3.3$ \mu $m and 3.6$ \mu $m, …
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CPU/GPU Code Acceleration on Heterogeneous Systems and Code Verification for CFD Applications
… are applied to verify the Spalart-Allmaras and k-omega SST model implementation, both in 2D and 3D. This dissertation shows that the spatial and temporal schemes are implemented numerically correctly.
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Investigation on High-Mobility Graphene Hexagon Boron Nitride Heterostructure Nano-Devices Using Low Temperature Scanning Probe Microscopy
… cm$^{-2}$) and lower resistivity ($\sim$ 10 k$\Omega$) at the Dirac point we observe scanning gate response along the graphene edges. Combined with simulations, our measurements suggest that enhanced edge doping is responsible for this effect. In addition, a device with low charge impurity …
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Comparing Turbulent Dispersion Models for RANS Simulations of Particle-Laden Flows
… used and the RANS simulations are run with the k-omega SST turbulence model. Variants of both the Discrete Random Walk (DRW) and Continuous Random Walk (CRW) dispersion models are looked at. Tracer particles stayed close to the center axis inside the pipe and showed the largest dispersion through …
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Computational analysis of planar wings designed for optimum span-load
… study of different turbulence models revealed k-omega-SST and k - kL-omega to be the most suitable turbulence models for this study. The model accuracy was determined using validations with experimental data from a previous study. The required accuracy was achieved using the most appropriate mesh …
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Open-Channel Flow With Roughness Elements of Different Spanwise Aspect Ratios: Turbulence Structure and Numerical Modeling
… turbulence model (a k-$\varepsilon$ and a k-$\omega$ closure scheme) which are further employed, together with dimensional analysis, to study suspended sediment transport processes in vegetated channels.
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Simulation of a Singular Cough Event in an Enclosed Breakroom
… a perforated plate covering the vent, using a k-omega SST model. This model serves as the inlet boundary conditions for the primary breakroom model. The breakroom's continuous phase is simulated using k-epsilon realizable, which accurately models boundary layers as well as open sections of the …
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Numerical Simulation and Experimental Validation of Fluid Flow and Mass Transfer in an Ammonothermal Crystal Growth Reactor
… were tested. The laminar and the standard k-omega models performed better compared with experimental results. By simulating an equivalent reactor that allows visualization and measurements, the CFD model was validated.With the validated model, simulations of the actual growth process …
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Wake deceleration of a racecar multielement airfoil in ground effect
… a two equation shear stress transport (SST) k–omega model coupled with a one equation intermittency transition model to predict the laminar-to-turbulent boundary layer transition. The simulations were performed for an inverted two-element airfoil consisting of a main element and a flap for a …
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Experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine
… fluid dynamics (CFD) models based on K-omega shear stress transport (SST) model. The computational work covers a wider range of simulation processes compared to the experiment which includes a parametric study based on the axial distance between the two rotors and blade height. The …
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Turbulent combustion simulation in realistic gas-turbine combustors
… approach such as a shear stress transport, K-omega, scale adaptive simulation (SSTKWSAS) combined with the partially premixed method identified in the first step are employed in a second step to further improve the accuracy achieved and to provide evidence and guidance in terms of the …
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