Rocket plume URANS simulation using OpenFOAM [PDF]
Results in Engineering, 2019 A key aspect in the launch environment of a space vehicle is the generation and propagation of noise, due to its effect in the payload. Obtaining experimental measures is an extremely difficult, so CFD techniques appear as a useful tool to estimate both ...
Mara S. Escarti-Guillem +2 more
doaj +2 more sources
Shaping the Flow: Impact of Blade Shape on Performance and Hemocompatibility in Rotodynamic Blood Pumps. [PDF]
Artif OrgansBlade shapes (leading‐edge geometry and thickness) in rotodynamic blood pumps were systematically evaluated. Thinner blades improve pump efficiency by reducing blockage effects, while neither blade thickness nor leading‐edge geometry shows clear hemocompatibility benefits. Overall, blade shape has a limited impact on hemocompatibility, indicating it is
Torner B +7 more
europepmc +2 more sources
Direct Numerical Simulations of Inhalation in a 23-Generation Lung Model. [PDF]
Int J Numer Method Biomed EngThe first direct numerical simulation of a 23‐bifurcation lung model is carried out. Fast and intense oscillations in the laminar flow are found in deep generations: their time scales are related to the upstream pressure fluctuations, and their intensity is related to upstream flow‐splitting fluctuations.
Atzori M +4 more
europepmc +2 more sources
, 2022 Since the 1990s, RANS practitioners have observed spontaneous unsteadiness in RANS simulations. Some have suggested deliberately using this as a method of resolving large turbulent structures.
Israel, Daniel
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Highly resolved LES and URANS computations of a differentially heated square cavity
International Journal of ThermofluidsThis investigation focusses on the use of two wall-resolved LES approaches for the simulation of the buoyancy driven flow in a differentially heated square cavity, aiming to advance understanding of the flow phenomena involved.
Constantinos Katsamis +3 more
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On the Reliability of Eddy Viscosity Based Turbulence Models in Predicting Turbulent Flow past a Circular Cylinder Using URANS Approach [PDF]
Journal of Applied Fluid Mechanics, 2012 Turbulent flow past circular cylinder at moderate to high Reynolds number has been analysed employing an secondorder time accurate pressure-based finite volume method solving two-dimensional Unsteady Reynolds Averaged Navier Stokes (URANS) equations ...
B.N Rajani, A. Kandasamy, S. Majumdar
doaj +1 more source
Comparison of a Miniaturized Implantable Two-Stage Rotodynamic Blood Pump to Equivalent Single-Stage Concepts. [PDF]
Artif OrgansThis study aims to evaluate the potential of a multistage pump design to enhance hemocompatibility in left ventricular assist devices. We found that the two‐stage concept offers favorable hemolysis measures compared to single‐stage designs, as the reduction in peak shear stresses outweighs the disadvantage associated with prolonged residence time ...
Linnemeier S +6 more
europepmc +2 more sources
DLR TAU-Code uRANS Turbofan Modeling for Aircraft Aerodynamics Investigations
Aerospace, 2019 In the context of an increased focus on fuel efficiency and environmental impact, turbofan engine developments continue towards larger bypass ratio engine designs, with Ultra-High Bypass Ratio (UHBR) engines becoming a likely power plant option for ...
Arne Stuermer
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Use of URANS approach for determination of temperature fluctuations when mixing triple-jet sodium at different temperatures [PDF]
Компьютерные исследования и моделирование, 2014 The possibility to study temperature fluctuations using URANS approach is studied. The results of numerical simulation of mixing processes for triple-jet sodium at different temperatures are presented.
Sergey A. Rogozhkin +7 more
doaj +1 more source
Standard and consistent Detached-Eddy Simulation for turbulent engine flow modeling: an application to the TCC-III engine [PDF]
E3S Web of Conferences, 2020 Multidimensional modeling of Cycle-to-Cycle Variability (CCV) has become a crucial support for the development and optimization of modern direct-injection turbocharged engines.
Krastev Vesselin Krassimirov +4 more
doaj +1 more source