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Showing 1 to 18 of 18 for “"RANS CFD"”.
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An improved blade passage model for estimating off-design axial compressor performance
… stable operating range. However, conventional RANS based CFD calculations of multistage axial compressors diverge at off-design operating conditions where large separation occurs and the stages are mismatched. This thesis demonstrates the feasibility of a body force based approach to capturing …
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Interference Drag Due to Engine Nacelle Location for a Single-Aisle, Transonic Aircraft
… The target aircraft was a single-aisle, transonic aircraft with a freestream Mach number of 0.8 at 35,000 feet and a design lift coefficient of 0.5. Using an MDO framework is necessary for placing the nacelle because of the competing objectives of the disciplines involved in aircraft …
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Design and Analysis of Low Reynolds Number Marine Propellers with Computational Fluid Dynamics (CFD) Transition Modeling
… low Reynolds numbers, where laminar-turbulent transition of the boundary layer can impact the distributions of pressure and shear stress on the blade surface. Marine propellers operating at low Reynolds numbers are subject to laminar-turbulent transition of the boundary layer, which impacts the …
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Numerical Investigation of Scaling Effects of a Ramjet-Powered Projectile
… performance is evaluated using high-fidelity RANS CFD models. Sensitivity to nonequilibrium laminar and turbulence-limited chemistry, and transitional turbulence treatments are evaluated. The physical sources of small scale performance limitations are identified for both fuel types. Finally, …
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Manufacturing Variability in High Pressure Turbine Rotor Blades
… then mapped to computational fluid dynamics (CFD) models and assessed aerodynamically. For the first study, blade sections were analysed using MIT’s Multiple Blade Interacting Streamtube Euler solver (MISES). The distribution of blade surface curvature was found to influence the blade surface …
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CFD analysis and design of a low-twist, hovering rotor equipped with trailing-edge flaps
… simple blade element method with 3D inviscid and RANS CFD that allowed for a robust sequence of design specification, analysis, and verification. Most modern helicopters have high levels of blade twist and various tip shape designs to help improve hover performance. However, such blade designs …
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Experimental Measurements of Pressure, Temperature, and Density Using High-Resolution N(2) Coherent Anti-Stokes Raman Scattering
… compared to similar quantities extracted from a RANS CFD simulation. The agreement between the mean CARS measurements and CFD predictions along the jet centerline and radial traverses is generally excellent. This CARS technique is able to capture the low-pressure and low-temperature conditions of …
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Validation of a CFD Approach for Gas Turbine Internal Cooling Passage Heat Transfer Prediction
… of a validated Computational Fluid Dynamics (CFD) modelling approach for internal cooling passages in rotating turbomachinery. A CFD Modelling approach and accompanying assumptions are tuned and validated against academically available experimental results for various serpentine passages. …
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Experimental and Numerical Investigations of the Aerodynamics of Flexible Inflatable Wings
… Tech Stability Wind Tunnel, and numerical CFD computations of these wings. The experiment was conducted in the modular wall configuration of the anechoic test section at speeds ranging from 15 − 32.5 m/s for three different tether attachment configurations and wings constructed out of two …
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Overview of the Skin Friction measurements on the NASA BeVERLI Hill using Oil Film Interferometry
… BeVERLI (Benchmark Validation Experiment for RANS and LES Investigations) hill. This project aims to develop a detailed database of non-equilibrium, separated turbulent boundary layer flows obtained through wind tunnel experiments for CFD validation. Skin friction measurements are obtained at …
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Experimental and Numerical Investigations of the Thermal Environment in Air-cooled Data Centers
… is to evaluate Reynolds Averaged Navier-Stokes (RANS) CFD as a tool to accurately predict the temperature distribution in air-cooled data centers with the aid of high quality test data. A data center research laboratory (RL) was constructed and heavily instrumented to measure power, flow rates, …
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Aerodynamics of Low Pressure Steam Turbine Exhaust Systems
… Firstly, the Computational Fluid Dynamics (CFD) solver ANSYS CFX was validated against experiments performed on a scaled test rig under representative part-load flow conditions. This validation exposed the weakness of Reynolds-averaged Navier–Stokes (RANS) CFD when there is a highly swirling …
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CFD Modeling of Separation and Transitional Flow in Low Pressure Turbine Blades at Low Reynolds Numbers
… occur in the turbine flow passages. For accurate CFD predictions of the flow, correct modeling of laminar-turbulent boundary layer transition is essential to capture the details of the flow. To investigate possible improvements in model fidelity, both two-dimensional and three-dimensional CFD …
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Numerical Studies of Jet-Wing Distributed Propulsion and a Simplified Noise Metric Method
… by parametric computational fluid dynamic (CFD) studies using the Reynolds-averaged, finite-volume, Navier-Stokes code GASP. The model was set up to be self-propelled by applying velocity and density boundary conditions to the blunt edge of the airfoil. A thick "inboard" airfoil from a …
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Adjoint-based geometry optimisation with applications to automotive fuel injector nozzles
Methods of Computational Fluid Dynamics (CFD) have matured, over the last 30 years, to a stage where it is possible to gain substantial insight into fluid flow processes of engineering relevance. However, the motives of fluid dynamic engineers typically go well beyond the level of improved …
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Analysis of complex flows in safety valves using CFD
… was to utilise Computational Fluid Dynamics (CFD) tools available to industry - primarily ANSYS FLUENT and ANSYS Workbench - to develop a modelling methodology which could allow CFD to be relied upon and be used as an analysis/design tool within the Pressure Relief Valve (PRV) industry. This …
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Adaptive swarm optimisation assisted surrogate model for pipeline leak detection and characterisation.
… artificial leaks. Computational fluid dynamics (CFD) offers the benefits of providing detailed and accurate pipeline leakage modelling, which may be difficult to obtain experimentally or with the aid of analytical approach. However, CFD simulation is typically time-consuming and computationally …
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The Effects of Pressure Gradient and Roughness on Pressure Fluctuations Beneath High Reynolds Number Boundary Layers
… 2D and 3D Reynolds Averaged-Navier-Stokes (RANS) computations. The effects of pressure gradient, pressure gradient history, roughness, combined roughness and pressure gradient, and combined roughness and pressure gradient history on boundary growth and the behavior of the underlying surface …