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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...
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 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...
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+...
STAR-CCM+ software was involved in the evaluation and optimization of a formula student vehicle design. The Chalmers University team participated in formula student competitions, taking place at Silverstone (UK) as well as at Hockenheimring (Germany). Team focused on the design of an aero package aiming to obtain the highest aerodynamic efficiency. It was consisted of a front and a rear wing, diffuser, also ducts for proper radiator and brake cooling. Starting from 2D simulations for different airfoil profiles until the full detailed vehicle the STAR-CCM+ was played a decisive role for...
Louis Garneau Sports (LGS) recently introduced to the market the P09 Time-Trial Helmet, which was first seen at the 2013 Tour de France with the Europcar Team. Like their previous TT helmet, the Vorticce, LGS teamed up with Lx Sim for the P09 aerodynamic development using CFD. Using the Vorticce as a good starting point, LGS wanted to reduce the drag even more while also maximizing ventilation for long races such as Ironman triathlons. To achieve this goal, Lx Sim used STAR-CCM+ with a model of over 30 million cells for the helmet and upper body of a rider in racing position. Simulations were...
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...
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...
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...
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...

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