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Before a CFD code is applied in a design or diagnostic environment, an adequate level of testing and validation should first be completed to develop confidence in the level of performance and accuracy of the code. In addition, the accuracy, reliability and utility of a code must be determined for the specific type of application of interest in order to establish credibility and confidence in its resultant data. A verification/validation study of the STAR-CCM+ code was undertaken as part of CRM solutions' code evaluation effort. The purpose of this study was to establish the proper function,...
The NASA Launch Services Program has funded several propellant slosh related projects over the years with the goal of obtaining experimental data to anchor CFD predictions. STAR-CCM+ is used to create a CFD model of water sloshing in an 8” diameter spherical tank. The predictions from this CFD slosh model are compared to experimental data to validate the results. The data compared include slosh natural frequency, damping rate and free surface topology. These important validations allow us to increase our confidence in STAR-CCM+ for use on NASA missions.
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...