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Numerical Validation of the Noise Characteristics of the Radial Fans with Forward Curved Blades
This presentation investigates the noise characteristics of radial fans with forward curved blades by performing CFD simulations with the emphasis on employing different turbulence models (RANS/URANS, DES, LES) and unstructured grids. The noise radiated from the fan is calculated with the aeroacoustic models provided by STAR-CCM+ (e.g. FW-H) and correlated with the results obtained from the hybrid approach (using ACTRAN) as well as the experimental results obtained from duct method according to DIN EN ISO 5136. The predicted noise spectra obtained from the simulations are in good agreement...
This presentation investigates the noise characteristics of radial fans with forward curved blades by performing CFD simulations with the emphasis on employing different turbulence models (RANS/URANS, DES, LES) and unstructured grids. The noise radiated from the fan is calculated with the aeroacoustic models provided by STAR-CCM+ (e.g. FW-H) and correlated with the results obtained from the hybrid approach (using ACTRAN) as well as the experimental results obtained from duct method according to DIN EN ISO 5136. The predicted noise spectra obtained from the simulations are in good agreement...
Transfer Function Method for Aeroacoustic Noise Predictions
High frequency aero-acoustic noise is a prominent issue with turbocharged small displacement engines. Currently, no approved methodology exists to predict this noise contribution. This presentation outlines an empirical based method to predict aero-acoustic noise generated from various tailpipe geometries. Using cold-flow bench testing and CFD analysis, it was found that high frequency sound pressure levels vary logarithmically with turbulent kinetic energy. This established transfer function, which accounts for noise sources from dean vortices and the turbulent exit wake, can be used to...
High frequency aero-acoustic noise is a prominent issue with turbocharged small displacement engines. Currently, no approved methodology exists to predict this noise contribution. This presentation outlines an empirical based method to predict aero-acoustic noise generated from various tailpipe geometries. Using cold-flow bench testing and CFD analysis, it was found that high frequency sound pressure levels vary logarithmically with turbulent kinetic energy. This established transfer function, which accounts for noise sources from dean vortices and the turbulent exit wake, can be used to...
Diagnosing Contributions to Interior Noise due to Exterior Flows modeled with STAR-CCM+
The prediction of the transmission of noise and vibration through a structure, due to excitation by an unsteady flow across various surfaces of the structure, is often referred to as aero-vibro-acoustics. Aero-vibro-acoustic applications are encountered in many different industries, including, for example, automotive interior wind noise associated with side mirror and underbody sources, launch vehicle interior noise and vibration induced by exterior fluctuating pressure loads on the fairing, aircraft interior noise associated with boundary layer and antenna wakes, and fan noise from...
The prediction of the transmission of noise and vibration through a structure, due to excitation by an unsteady flow across various surfaces of the structure, is often referred to as aero-vibro-acoustics. Aero-vibro-acoustic applications are encountered in many different industries, including, for example, automotive interior wind noise associated with side mirror and underbody sources, launch vehicle interior noise and vibration induced by exterior fluctuating pressure loads on the fairing, aircraft interior noise associated with boundary layer and antenna wakes, and fan noise from...
Applied CFD Education using STAR-CCM+
It is nice to finally have a CFD platform where a new student can pick it up, learn it and deliver a finished product with believable results – all within a 10 week, 3-credit-hour course. At Oregon Institute of Technology, we have begun teaching ‘Applied CFD using STAR-CCM+ as the platform’. Sixteen students (half graduate and half undergraduate students) took our course for the first time in the winter term of 2012. In the first half of the course, they learned the program and best practices of CFD. In the last five weeks, they selected and worked through their own individual projects from...
Thermal Cycle CFD Simulation of a Charge Air Cooler
Charged Air Cooler (CAC) used in heavy machinery and equipment is exposed to alternating heating and cooling even when the vehicle is not operational and at varying engine speeds which causes considerable thermal stress and fatigue. Hence, failure rate of CAC product is considerably high and the need to analyze the product computationally is of paramount importance. Current effort is to develop a simulation methodology to obtain temperature distribution of the Charged Air Cooler, which can then successfully mapped onto a structural model for a structural and fatigue analysis. Emphasis is...
Charged Air Cooler (CAC) used in heavy machinery and equipment is exposed to alternating heating and cooling even when the vehicle is not operational and at varying engine speeds which causes considerable thermal stress and fatigue. Hence, failure rate of CAC product is considerably high and the need to analyze the product computationally is of paramount importance. Current effort is to develop a simulation methodology to obtain temperature distribution of the Charged Air Cooler, which can then successfully mapped onto a structural model for a structural and fatigue analysis. Emphasis is...
Simulation Based Design Applied to Senior Design
The department of Aerospace Engineering at Iowa State University has revamped the senior design capstone project. With the increased power and efficiency of computational tools and the direct integration of CAD, we have developed a capstone project with a simulation-based design focus that enables our students to design a full size aircraft to fulfil a specific mission profile. In addition to the simulation, the students are also required to build, test and fly a demonstration model. The revised process utilizes a top down design paradigm which means that the students are developing and...

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