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Numerical Simulation of Unsteady Interaction of Hot Streams with HPT Rotor Blades using Harmonic Balance Method Implemented in STAR-CCM+
Unsteady phenomena in HP turbines are caused by interaction of spatially non-uniform field of the gas flow parameters downstream of the NGV with the rotating blades of the rotor wheel. This presentation details the use of the harmonic balance method in STAR-CCM+ to solve problems of unsteady interaction of the hot streams downstream of the combustion chamber with the rotating blades of the rotor wheel. The hot streams downstream of the combustion chamber are caused by discrete circumferentially located fuel nozzles and openings for air supply to the combustion chamber mixing zone. Unsteady...
Forced Response Analysis of a Radial Inflow Turbine using STAR-CCM+
Radial inflow turbines are subjected to high engine order excitation that causes high cycle fatigue. In order to fulfill endurance and integrity requirements, it is necessary to determine the high engine order excitation that depends on structural as well as aerodynamic operating conditions. The lifetime limiting dynamic stresses induced by blade vibration due to high engine order excitation can be estimated by evaluating the forced response function of the tuned system. In order to calculate the forced response function, it is necessary to predict aerodynamic excitation forces and...
Coupling STAR-CCM+ with IOSO Optimization Software by the Example of an 8-Stage Axial Jet Engine Compressor
The task of this work is to develop a procedure for integration of IOSO optimization software package with STAR-CCM+ CFD-code. The example here shows optimization of the flow controling guide vanes of the first two compressor stages. The aim is to improve the engine's performance and provide the methodology to improve other engine's components. The CFD model is prepared in Turbo Wizard and involves java scripting for calculation of the objective function and tuning design parameters.
Cavitation CFD using STAR-CCM+ of an Axial Flow Pump with Comparison to Experimental
Cavitation is a critical phenomenon in liquid turbomachinery. It can deteriorate performance and damage the internal components. It can also deteriorate flow range. STAR-CCM+ has proven to be a useful tool in the design and analysis of cavitating turbomachinery. The unsteady cavitation model can be used to predict net positive suction head (NPSH) breakdown, and as well as predict the internal pressures and forces on the various internal components. Axial flow pumps are devices that produce low head at high mass flow rates. They are subject to cavitation at low inlet pressures, and so they...
Aeroacoustic Optimization of an Axial Fan with Variable Blade Loading
The project aims to perform a multi-objective evolutionary optimization of an axial fan. The objective functions minimize noise generation and maximize the aerodynamic efficiency. The fan consists of seven individually shaped blades which are fitted with winglets and turbulators. This particular arrangement helps to reduce tonal noise. The geometry of the blades is parameterized using the circumferentially averaged swirl and a corresponding solution of the Euler equations in Mathematica. The geometry of the winglets, the hub and the shroud is parameterized in the 3D-CAD Modeler of STAR-CCM+...
Multi-Objective Optimization of a Grease Mechanical Filter using modeFRONTIER & STAR-CCM+
This presentation deals with the multi-objective optimization of a mechanical filter for solid suspended substances used in extractor hoods of industrial kitchens, coupling STAR-CCM+ with modeFRONTIER. The filter performance has been analyzed by means of a STAR-CCM+ multiphase and unsteady model, that has been experimentally validated in Trieste University laboratory through a Laser Doppler velocimetry. Since the baseline performance is not satisfactory for particles of diameter less than 10 micron, the geometry has been optimized through the coupling of multi-objective optimization...
Improved Vehicle Fuel Economy Through Optimization
With more strict regulations on reducing fuel consumption and exhaust emissions, reducing energy use of the vehicle becomes critical. Part of the energy consumption is due to efficiency losses from the engine, and cooling system. At high speed, a large portion of energy loss is related to the aerodynamic drag of the vehicle. The purpose of this presentation is to demonstrate a method to reduce energy consumption of the vehicle using a commercial optimization package. The optimization looks at different grill angles, grill opening, bumper opening, fan size, and fan RPM on a simplified vehicle...
Fluid-Based Topology Optimization of an EGR Flowsplitter
In order to meet the required Exhaust Gas Recirculation rate, EGR modules contain nowadays heat exchangers. Typically, single-pass or two-pass coolers are used. When an EGR cooler with a two-pass inlet is considered, a mass flow split ratio of 0.5 per duct is a required condition for obtaining a maximum cooler efficiency. The needed partition of the exhaust flow upstream of the cooler is achieved by using flowsplitter geometries. This presentation deals with the optimization of a flowsplitter. The objective of the study was to obtain a design with an improved flow balance. Furthermore, a...
Fluid Structure Interaction in STAR-CCM+
An overview of the challenges of FSI will be presented along with the capabilities available in the STAR-CCM+ to meet those challenges. The topics will include Data mapping techniques, Protocols and formats for exchanging data between CFD and CSM codes, Coupling methods for stability and accuracy, Techniques for dynamic fluid mesh evolution, and Validation of FSI results. A technical overview under each of these topics will be provided. A range of examples which demonstrate the STAR-CCM+ FSI capabilities and validate the accuracy will be shown. The examples span analytical and experimental...
Driving Design Innovation
In this talk, we'll focus on how leading companies are streamlining the virtual product development process by implementing four enabling technologies, namely: Process automation Scalable Computation Efficient Design Exploration, and Sensitivity & Robustness Assessment We will highlight how the HEEDS technology from Red Cedar Technology is being used to accelerate design processes, improve workflow between CAD and CAE, discover better designs, and identify the most robust designs for manufacturing. Key case studies in automotive, aerospace, life sciences and energy will be used to...

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