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Showing 1 to 12 of 12 for “"Transitional flows"”.
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Turbulence models for the numerical prediction of transitional flows with RANSE
… ways to accurately compute high Reynolds number flows with Reynolds Averaged Navier-Stokes Equations (RANSE) solvers. In naval architecture, turbulence models are necessary to solve typical hydrodynamic problems both in model scale, where Re=O(106), and in full scale, typically Re=O(108), since …
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Multidimensional and High Frequency Heat Flux Reconstruction Applied to Hypersonic Transitional Flows
… fluctuations supported by hypersonic flow in transitional boundary layers. The focus of this research is on understanding the mathematical properties of the reconstruction such as regularity, sensitivity to noise, multi-resolution, and accuracy. This research is part of an effort to develop …
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High Resolution Simulation of Laminar and Transitional Flows in a Mixing Vessel
… investigated in detail: Reverse/reciprocating flows at very low Re (<10); stalled flows at low Re (â 10); laminar pumping flow for higher Re and transitional pumping flow (10 squared < Re <10 to the 4th). For the three Re numbers 1, 10 and 28, it was found that for the higher Re number (28), …
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Experiments on transitional regime sediment density flows and resulting deposits
… the sedimentary deposits of submarine density flows. Certain density flows may transition from a more turbulent to a more coherent flow regime e.g. by a loss of velocity in flows with large concentrations of suspended sediment. Such transitional flows are produced when turbulence becomes …
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Development of a Hybrid Particle Continuum Solver
<p>When simulating complex flows, there are some physical situations that exhibit large fluctuations in particle density such as: planetary reentry, ablation due to arcing, rocket exhaust plumes, etc. When simulating these events, a high level of physical accuracy can be achieved with kinetic …
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Incompressible flow over a three-dimensional cavity
… itself includes two part: 1) simulation of the transitional flow and 2) prediction of the transitional areas in the shear layer of the cavity. A CFD code based on the large eddy simulation approach is developed for the simulation study. For the prediction of the areas of transition, a …
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Quantification of Reynolds-averaged-Navier-Stokes Model Structural Hypothesis Uncertainty in Transitional Boundary Layer and Airfoil Flows
… uncertainty it induces on RANS predictions of transitional flows has been ignored so far due to the conceptual complexity involved in the associated uncertainty quantification. This type of uncertainty is called the model structural hypothesis uncertainty. In this thesis, a systematic …
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Magnetohydrodynamic Heat Transfer for Fusion Energy
… correlation for turbulent magnetohydrodynamic flows. Fluids used as breeder/coolant in fusion power plant blankets must provide adequate heat transfer of up to 10 MW/m2 within strong magnetic fields . Because the two most popular choices for this function (liquid metals and molten salts) are …
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Studies on secondary instabilities
… advances in understanding early stages of transitional flows have been achieved by studying secondary instabilities in selected prototype flows. These secondary instabilities can be modeled as parametric instabilities of the nearly periodic flow that consists of the prototype velocity …
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Validation and Verification of the Wray-Agarwal Turbulence and Algebraic Transition Models for 2D External Airfoil Flows
… bodies. To further validate this model, the transitional flows past NACA 0012, 0015, and 0018 airfoils are simulated for a range of Reynolds numbers, turbulence intensities, and angles of attack in ANSYS Fluent. The NACA airfoil cases are simulated at angles of attack from zero to ten …
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Model-based control of transitional and turbulent wall-bounded shear flows
University of Minnesota Ph.D. dissertation. January 2013. Major: Electrical Engineering. Advisor: Professor Mihailo R. Jovanovic. 1 computer file (PDF); xvii, 242 pages, appendices A-E.
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The study and control of wall bounded flows : El estudio y control de flujos de pared
Turbulent wall-bounded flows are important, because many of the flows found in industry and nature belong to this type of flows. One of the examples is the flow in the low pressure turbine part of an engine. Efficiency can be increased by increasing the curvature of the blades. However, this leads …