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Showing 1 to 11 of 11 for “"vortex model"”.
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Particle filtering with Lagrangian data in a point vortex model
… does not rely on linearization of the forward model and can provide very accurate estimates of the state, as it represents the true Bayesian posterior distribution using a large number of weighted particles. In this work, we study the performance of various particle filters for LaDA using a …
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Determination of a Simplified High-Order Vortex Equation for Radial Equilibrium with CFD Verification
<p>The goal of this thesis is to determine a flow model that provides a better blade design over current design techniques utilizing a hybrid vortex model. This hybrid vortex model combines the well-established simple radial equilibrium vortex models into a higher order equation that will establish …
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Aerodynamic modeling of a 2-dimensional airfoil with a covert-inspired deployable flap using a discrete vortex method
… on the development of a low-order discrete vortex model meant to predict the lift of an airfoil with a covert-inspired flap. Results show that the discrete vortex model is able to reproduce the experimental results for certain flap deflection angles.
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A Study of Fusion Product Effects in Field-Reversed Mirrors
… through the development of two new computer models. The first code (MCFRM) treats fps as test particles in a fixed background plasma, which is represented as a fluid. MCFRM includes a Monte Carlo treatment of Coulomb scattering and thus provides an accurate treatment of fp behavior even at …
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Mixing enhancement by dual speed rotating stirrer
… two dimensional (in a circular container), is modeled by a point vortex model consisting of a vortex rotating in a circular container at constant angular speed. The mixing problem is addressed by considering the Hamiltonian form of the advection equations formulated in a frame of reference …
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The evolution of vortices in a turbulent boundary layer
… this investigation, the evolution of a perturbed vortex tube near a boundary is examined in order to gain insight into turbulent boundary layer phenomena. A Lagrangian vortex model is used to describe the vortex tube evolution, including the influence of shear. Based on numerical calculations, it …
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Machine Learning for Coherent Structure Identification and Super Resolution in Turbulent flows
… velocities of the coherent structures. A Rankine vortex model is utilized to implement a Markov chain Monte Carlo-based vector matching to overcome this problem. Ultimately, a framework was developed for robust identification of vortices that is capable of visualizing the cumulative distributions …
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Influence of eddy-eddy interactions and tropical wind variability on sudden stratospheric warming formation
… anomalously strong tropospheric wave flux in the model is similar to that of SSWs in the observed atmosphere, but that the fractions for splits and displacements are different. Furthermore, a large fraction of SSWs occur without significant anomalous tropospheric wave flux, indicating that …
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Optimum Spanloads Incorporating Wing Structural Considerations And Formation Flying
… each airplane. For single aircraft, a discrete vortex method which performs the calculations in the Trefftz plane has been used to calculate optimum spanloads for non-coplanar multi-surface configurations. The method includes constraints for lift coefficient, pitching moment coefficient and wing …
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Untersuchungen zur Entstehung und Stärke von Triebwerkseinlaufwirbeln
A vortex system can occur in an inlet of a jet engine operated near the ground. These vortices reach into the inlet and can show significantly different strength and shape dependent on several geometrical and flow parameters. The inlet-vortices often form especially with a foot on the ground when …
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Vliv vzájemného provozu vtoků na jejich energetickou účinnost a tvorbu hladinových vírů
Předložená diplomová práce obsahuje několik dílčích částí. Jedná se zejména o rešerši v oblastech jednosměrných vtoků: energetické účinnosti vtoků a jejich ovlivnění provozem sousedních vtoků, dále o stádia tvorby hladinových vírů, ovlivňování vírových struktur vzájemným provozem sousedních vtoků a …