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Optimizing Jets for Active Wake Control of Ground Vehicles
A Detached Eddy Simulation (DES) turbulence model is used to conduct wake refinement of a 25 deg Ahmed reference body. This model was chosen for its highly three-dimensional flow characteristics and its ability to properly simulate a standard automotive wake. Slot jets were designed at the rear of the Ahmed body and several optimization simulations were conducted using Optimate+. The initial optimization simulations were conducted to determine the sensitive variables. These variables were jet velocity and exit angle. After these variables were determined, another optimization simulation was...
The Design & Analysis of a low NPSH Centrifugal Pump Featuring a Radial Inlet & an Axial Inducer using STAR-CCM+
The design of low Net Positive Suction Head (NPSH) pumps requires special attention. The subject pump stage is part of a two stage pump. The pump is required to possess a very large range of operation at very low inlet pressures. The pump also has a very large shaft that restricts the inlet bladed flowpath area, thus raising inlet flow velocities and decreasing local static pressures. Compounding difficulties, this pump requires a radial inlet that will quickly transition the flow from radial to axial. Radial inlets have a unique problem of creating a circumferentially uniform flow at the...
This presentation discusses a theoretical one-dimensional model and Computational Fluid Dynamics (CFD) simulations of a tailcone-installed APU cooling system using STAR-CCM+. The work is motivated by the need to deliver sufficient cooling airflow to critical components within an aircraft tailcone compartment. The cooling system considered herein utilizes an eductor system at the APU exhaust and a ram air scoop near an upstream inlet to the compartment to induce the necessary cooling flow during ground and in-flight APU operation. A one-dimensional flow network model provides a framework for...
Quick and accurate predictions for heat transfer in internal cooling channel geometries can increase throughput when designing new geometries or down selecting first test cases. Typically, the ability to predict within 20% of experiments has been deemed acceptable but often requires very fine meshes and longer run times, especially for more complicated geometries. A case study of a classic open literature experimental study is used within to describe the sequence of steps and lessons learned in order to achieve quick and accurate predictions of local Nusselt number. Impact of boundary...
In recent years, there have been increasing uses of Computational Fluid Dynamics (CFD) as a modeling and simulation tool for a multitude of engineering applications in the Oil & Gas industry. Examples include flare design, flow assurance, dynamic fluid-structure interaction and many others. Of these, CFD has experienced tremendous growth as a consequence modeling tool in safety engineering. Major offshore accidents in recent times have prompted operators and EPCs to step up safety measures, making Health, Safety and Environment (HSE) as one of their top priorities for all existing and...
First of all, the computational process in SPEED and the coupling process with STAR-CCM+ are described in this presentation. For an accurate prediction of the heat transfer between stator copper parts (slots and windings) and coolant, detailed models of these parts have been created and used for the modeling of the complete electric motor in STAR-CCM+. The numerical results are compared for different load cases with experimental results under laboratory conditions and numerical results obtained with the software MotorCAD. The comparison shows a very good agreement with the experimental...
Valeo Climate Control has been using CD-adapco's software for CFD simulation since 1997. Since 2000 we started to develop automatic processes for HVAC CFD simulation which concerns evaluation of basic characteristics of our product, air-condition units for the automotive industry. These processes were developed for STAR-CD. In 2005 our US division began to migrate to STAR-CCM+ and at the same time started to develop a new tool based on JAVA which ensured stability, robustness and automation of the CFD simulation process on HVAC. The same tool is now being used with STAR-CCM+ for different CFD...
The aluminum EGR cooler with pre-cooler integrated has been developed using CFD analysis. Because the temperature of exhaust gas in commercial CNG engines exceeds the temperature limit of EGR valve system, a new cooling strategy is required. For the concept design of the cooler, efficiency is first evaluated by STAR-CCM+. Moreover, the efficiency of the cooler with external pre-cooler has been studied for the comparison. Conjugate heat transfer among the exhaust gas, engine coolant and EGR cooler is modeled. For considering wave EGR cooler fin effect, the simplified tube fin model is used. In...
The thermal prediction of vehicle body environments is of high importance in the design, optimization and management of vehicle power systems. Within the pre-development phase of a vehicle's production process, it is important to understand and determine regions of high thermally induced stress within the exhaust system itself and surrounding underbody components. This early stage of prediction allows engineers to rapidly modify the design or alter component material characteristics without incurring significant costs related to experimental testing. Today's current industrial standard of...
Conventional treatment of Hypoplastic Left Heart Syndrome (HLHS), the Norwood operation, establishes univentricular circulation through a series of highly invasive reconstructive procedures. The relatively new Hybrid Norwood (HN) operation involves a less invasive strategy that avoids a cardiopulmonary bypass (heart-lung machine), deliberate cardiac arrest and circulatory arrest of the patient in the neonatal period . We present multiscale model of the entire circulatory system developed utilizing an electrical lumped parameter model (LP) for the peripheral or distal circulation coupled with...

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