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Showing 1 to 20 of 23 for “"high-fidelity cfd"”.
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Improving turbomachinery loss prediction using high fidelity CFD
High fidelity simulations of three compressor cascades and a fundamental trailing edge flow are used to interrogate, and improve upon, the errors present in conventional RANS simulations. Using the optimum turbulence viscosity, calculated from the high fidelity simulations, it is found that error …
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Multi-fidelity strategies for lean burn combustor design
… use of unsteady computational fluid dynamics (CFD) simulations of transient combustor aero-thermo-dynamics to provide an insight into the complex reacting flow-field is expensive in terms of computational time. A large number of such high-fidelity reactive CFD analyses of the objective and …
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Shock estimation in supersonic vehicles
Improving the design of future high-Mach vehicles is crucial to enhance performance,safety and sustainability of future air travel. Advanced designs can be realized by improving low fidelity modelling in the context of Multidisciplinary Design Optimization (MDO) on one side and making the use of …
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Study of reduced order models for vortex-induced vibration and comparison with CFD results
… be compared with the results obtained from a high fidelity CFD simulation to determine the relative quality of each reduced order model. The deficiencies of each model and the effects they produce will also be explored. Finally, the most important traits of each reduced order model will be …
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Incorporation of High-Fidelity Flow Field Information into Preliminary Design of Multi-Stage Axial Compressors
… methodology that incorporates pre-performed high-fidelity CFD into the performance estimation of multi-stage axial compressors during preliminary design. Its key differentiator is that radial non-uniformity, inferred from three-dimensional CFD and represented using orthonormal basis …
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Hydrodynamic Design of Highly Loaded Torque-neutral Ducted Propulsor for Autonomous Underwater Vehicles
… underwater vehicle (AUV) that operates at a very high loading condition. The design method is applied to Virginia Tech Dragon AUV. It is based on the parametric geometry definition for the propulsor, use of high-fidelity CFD RANSE solver with the transition model, construction of the surrogate …
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System Identification CFD-Based Reduced-Order Modeling for Hypersonic Vehicles
… reduced-order models combined the accuracy of high-fidelity hybrid Reynolds Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) computational fluid dynamic (CFD) models with the computing speed of low-fidelity inviscid CFD models, efficiently capturing the effects of complex physics …
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Dynamics of Pitching Wave Energy Converter with Resonant U-Tank Power Extraction Device
… the frequency, are demonstrated by a series of high fidelity CFD simulations. These simulations are a systematic series of fully viscous turbulent simulations, using unsteady RANSE solvers, of the water sloshing at different frequencies of oscillation. Calibration of Lloyd’s model with CFD …
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Advanced Computing and Sensing to Improve Mine Fire Characterization and Response
… and the large domains of interest. Additionally, CFD and network models used for predicting fire conditions are computationally expensive with long simulation processing times for informing real-time decision making. A new generalized procedure to design artificial neural networks (ANNs) capable …
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Predicting Large Domain Multi-Physics Fire Behavior Using Artificial Neural Networks
… flow, and the reaction of combustible materials. High-fidelity predictions of fire behavior using computational fluid dynamics (CFD) models come at a significant computational cost where simulation times are often measured in hours, days, or even weeks. A new simulation method is to use a machine …
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Extraction of turbomachinery loss mechanisms from high-fidelity simulations
With recent advances in high-power computing, Direct Numerical Simulations (DNS), high-fidelity fluids simulations which are able to capture the full turbulence spectrum, are becoming a more common-place tool for the analysis of turbomachinery. As a result, new challenges arise in the management …
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Model Reduction of Computational Aerothermodynamics for Multi-Discipline Analysis in High Speed Flows
… hypersonic cruise vehicles capable of sustained high-speed flight and access to space. However, an extensive set of technical challenges have obstructed the development of such vehicles. These technical challenges are partially due to both the inability to accurately test scaled vehicles in wind …
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Real-time Autonomy and Maneuvering Simulation of an Unmanned Underwater Vehicle Near a Moving Submarine Using Actively Sampled Gaussian Process Surrogate Models
… On the other hand, Computational Fluid Dynamics (CFD) accurately models these hydrodynamic interactions, but a simulation of a single UUV in one specific configuration typically takes hours or days to complete. Therefore, it is not practical for real-time applications. To bridge this gap, a …
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Numerical simulation and modelling of the effect of film cooling on entropy noise in a stator blade row
… The entropy wave is therefore accelerated at a higher rate, leading to additional entropy noise.<br/><br/>3D simulations demonstrate that a cooling mass flow increase of only 3.4% with respect to the freestream amplifies the entropy noise generation by over 12%. Since the cooling flow is …
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Software for Multidisciplinary Design Optimization of Truss-Braced Wing Aircraft with Deep Learning based Transonic Flutter Prediction Model
… operating in the transonic flight regime. High-fidelity CFD simulation is performed to verify the result obtained from extended Strip theory based aerodynamic analysis method. An approach is presented to develop a deep neural network (DNN)-based surrogate model for fast and accurate …
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CFD modelling of flow-induced vibration under multiphase flow regimes.
… and chemical flow systems. The problems include: high amplitude displacement of the pipe structure due to resonance; fatigue failure due to excessive cyclic stress, induced by fluctuating forces; and structural wear, due to the relative motion of the pipe and its support. Current industry …
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Development of a dynamic modelling of biomass boilers using flownex
… in availability of site data and availability of high-fidelity CFD furnace validation, meant implementing assumptions such as the inclusion of localised convection effects during calibration with the available site measurement data. The fine tuning of the model during calibration extended to fluid …
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High-Fidelity Computational Analysis of the Aerothermal Performance of In-serviced Jet Engine Blades
In today’s civil aviation, the struggle for higher jet engine efficiencies has pushed the manufactures into the continuous challenge of developing new and better design and optimization strategies. In the information age, it is only natural that a great deal of this effort is going to be carried …
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Design Optimisation and Flow Characterisation for Future Aeroengine Axial Fan Blades
The increased need to design higher performing aerodynamic shapes has led to design optimisation cycles requiring high-fidelity CFD models and high-dimensional parametrisation schemes. The computational cost of employing global search algorithms on such scenarios has typically been prohibitive for …
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Numerical modelling of thermoacoustic engines and coolers
… engine and cooler systems, utilising high-fidelity time-domain computational fluid dynamics (CFD) simulations. The research establishes a robust and detailed modelling framework capable of capturing complex fluid-dynamic and thermo-dynamic phenomena in oscillating flows. Special …
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