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One of the difficulties of optimization of any design using CFD is the sheer number of runs required using traditional methods. This presentation details the use of Optimate for the optimization of a generic glider. This case was designed to stress the SHERPA algorithm with a realistically complex set of design criteria to optimize an aerodynamic vehicle, including stability requirements and trimmed L/D performance requirements.
TLG Aerospace was tasked by a customer to provide unsteady buffet loads on a rocket with 'hammer-head' configuration at transonic Mach numbers. Accurately capturing the physics of time-unsteady bluff body shedding, recirculation and reattachment required a large scale application of the STAR-CCM+ DES flow solver. As part of the customer analysis, validation work was done against NASA wind tunnel data on a similar geometry. The NASA report published rocket geometry, steady state (time averaged) pressures and unsteady pressures in the form of RMS ΔCP . The steady state (RANS) correlation was...
STAR-CCM+ continues to expand its presence in the global aerospace community due to capabilities that allow accurate, rapid and robust simulations for a wide range of applications associated with aerodynamics, propulsion and aircraft systems. This presentation will highlight recent and upcoming capability enhancements in STAR-CCM+ related to these applications including overset mesh, continuity convergence acceleration and others. Discussions will include problem setup techniques, results and key features leading to successful aerospace engineering analyses.
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.
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...

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