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This material was first presented at the America Helicopter Society. The hub drag of traditional helicopters is nominally 15-25% of the total vehicle drag and fairings to reduce the drag on production hubs have generally not been used because they inhibit inspection and maintenance procedures. As an alternative to using fairings, it may be possible to minimize the hub drag by designing hub sub-components that result in a reduced drag when installed in the complete hub. This demands the accurate prediction of drag in a timely manner so that estimates of vehicle performance can be made with...
Continuing Challenges in Aeroacoustics
The past few years have seen an enormous uptake for aeroacoustics simulations, substantiating the claim that STAR-CCM+ leads the field for validation and application in this area of flow-noise predictions among commercial codes. This presentation underlines the successes in a wide range of application sectors. We also look forward to future challenges in aeroacoustics and aero-vibroacoustics, towards which CD-adapco continues to make significant investments.
The past few years have seen an enormous uptake for aeroacoustics simulations, substantiating the claim that STAR-CCM+ leads the field for validation and application in this area of flow-noise predictions among commercial codes. This presentation underlines the successes in a wide range of application sectors. We also look forward to future challenges in aeroacoustics and aero-vibroacoustics, towards which CD-adapco continues to make significant investments.
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...

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