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Swirling flow in gas turbine combustors is a very common tradition in aerospace and/or industrial applications. This is because, swirl flows help to anchor flames, and cause better air-fuel mixing which enhance combustion efficiency and reduce harmful emissions. As a result, it is of a high interest to be able to predict the behavior of swirling turbulent flows in order to better design combustors...
Owing to huge casualty and environmental pollution caused by HNS(Hazardous and Noxious Substance) leakage, accurate prediction modeling must be crucial in coping with the accidents at the early stage. Our project finally aims to develop an engineering prediction model for accurate near-field prediction of diffusive behavior in risk regions, when HNS spills occur using CFD according to various environmental...
This paper presents the extension of the open source Stanford University Unstructured (SU2) software suite to perform transition prediction simulations, which are caused by either Tollmien-Schlichting streamwise instability or crossflow instability. The integrated equations, γ-Reθt model and γ-Reθt-CF model, solving computational fluid dynamics analysis are coupled with Spalart-Allmaras turbulence...
Reynolds Averaged Simulation (RAS) and Large Eddy Simulation (LES) are two widely used turbulence modeling approaches in Computational Fluid Dynamics (CFD). RAS simulations require less computing times than used by LES. When large eddies of flow become dominant, RAS simulations cannot predict accurate results. Hybrid RAS-LES approach is effective solution to reduce computational cost and time. In...
This study illustrates basic guidelines for integrating empirical measurements to state of the art modeling approaches; that can be used to improve the accuracy of physics based data center CFD models. Experimental measurements gathered in a new research dedicated data center laboratory are used to guide an advanced approach to CFD modeling, the intent is to come up with a validated predictive model...
The objective of this study is to predict the pressure gradient for gas-liquid bubbly flow along a vertical pipeline by using a Computational Fluid Dynamics (CFD) numerical simulation. The CFD simulation is compared with experimental data obtained from the literature, which involves a vertical pipe with a length of 1.52 m and an inner diameter of 11.68 mm. Empirical correlations available in the literature...
In recent years, sediment scour near bridge piers and abutment is a serious problem which cause nationwide concern because it has resulted in more bridge failures than other causes. After this question arose, more and more numerical analyses about this problem have been carried out. In this study, computational model simulations using a 3D Computational Fluid Dynamics (CFD) model were conducted to...
IMO(International Marine Organization) adopted the mandatory application of the EEDI(Energy Efficiency Design Index) for new ships in order to reduce the emissions of CO2(IMO, 2011). Added resistance, which is defined as an increased resistance of ships in waves, have a large effect on emissions of CO2. It is important that exact estimation of added resistance is essential for precise calculation...
By the Aerodynamic Numerical Simulation and Performance Prediction of Wind Turbine Rotor, the researchers would understand the aerodynamic performance and characters of aerofoil, blade, and unit of wind turbine; approve the feasibility and reliability to aerodynamic numerical simulation of wind turbine; optimize the aerofoil, blade and rotor to optimize the blade aerodynamic performance; calculate...
We report the utilization of radial basis function neural networks (RBFNN) with multi-quadric (MQ) and inverse multi-quadric (IMQ) basis functions for numerical simulation of velocity-field reconstruction in fluid-structure interaction (FSI) problem with the presence of a very step velocity jump at the fluid-solid interface. The NN models were developed and utilized as approaches of investigation...
The main geometric structural parameters which affected the performance of the compression cell of the helico-axial multiphase pump greatly were selected as the research object. The groups of impeller parameters were determined by the orthogonal experimental design method. Then the pressure rise and efficiency for each group which were obtained through numerical simulation according to CFD method...
The aim of this paper is to present the multidisciplinary high resolution (grid size up to hundred meters) complex of numerical hydrodynamic-oil spill forward and backward models for the coastal zone simulation.
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