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Simulation of noise in HVAC ducts
For an automotive HVAC system the noise created and perceived by the occupants is an important factor that has to be accounted for. The system has to create an environment which provides a sufficient amount of cooling or heating to keep the occupants comfortable, but not at the detriment of excessive noise due to the air flow. Therefore the HVAC duct system has to be designed to deliver the air efficiently and quietly into the cabin. To achieve such desirable conditions the system has to be designed early in the vehicle programme using CAE techniques. CFD methods are maturing in the area of...
Battery Design Studio® - an update
Several important capabilities of Battery Design Studio® will be presented including the capability to simulate three-dimensional pouch cells, current distribution in spiral cells and concentration-dependent, solid-phase, diffusion coefficients. These capabilities enable battery designers to size current collectors and tabs for the large lithium-ion cells used in automotive applications. Further, the enhancements to the physics-based models improve their capability to simulate the very high-rate behavior of lithium-ion batteries. Lastly, the road map for upcoming capabilities of the software...
Aerodynamic Validation Studies for Space & Defense Applications
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,...
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...

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