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Vehicle thermal protection has become more important than ever in the vehicle development process. Harsher emission standards and improved fuel economy driven by legislation weighs against the driver’s desise for cars with good driving performance. These challenges are driving development towards compact engine layouts with higher specific engine performance. In addition, a tighter packaging of the exhaust system next to the engine is causing higher thermal loads in the engine compartment. The major aim of thermal protection is to ensure that all components inside the vehicle stay well below...
Hybrid RANS-LES methods can be very useful when high detailed insight into turbulent flow is required, in which instantaneous fluctuations play a critical role. For example when a high-accuracy prediction of complex flow separation is needed, or for insight into thermal fatigue due to fluctuating flows at different temperature, or for the approximation of acoustic noises levels via measurement of fluctuating pressure. Compared to the full deployment of Large Eddy Simulation (LES), the Hybrid methods are designed to retain an economical RANS turbulence model in regions where they are expected...
Degrémont is a global leader in the design, build and operation of water and wastewater treatment plants all over the world. These plants employ a number of components standardized by Degrémont but since each plant is unique, bespoke design is necessary in both new-builds and retrofits when it comes to the large treatment structures. Together, all of the components that form a treatment plant intend to change the physical and chemical characteristics of the water to suit the delivery needs (potabilisation and/or pollutants removal by filters, settlers, biological aerated tanks, to name a few...
A common difficulty in simulations of complex fluid flow problems is that not every geometry especially for the case of relative motion between components can be well represented using a single, contiguous grid. Overset grids can be used to track relative motion with computational efficiency. Recent advances in high performance Computational Fluid Dynamics (CFD) software have enabled the coupled simulation of multiphase fluid flow and rigid body motion in overlapping overset grids. A CFD method is developed and applied for the simulation of oil flow in multiple rotating spur-gear systems with...
Aerotherm was contracted to evaluate the dynamic behaviour of a large nozzle check valve integrated into a feeder tank system forming part of a pipeline project in Southern Africa. The scenario investigated considered the dynamic response (opening) of the nozzle check valve should the head in the main pipeline suddenly be lost. Several techniques were explored to implement the dynamic plunger motion into the simulation. STAR-CCM+ enabled Aerotherm to in a very short time frame develop a practical methodology to model the dynamic plunger motion. This technique utilised user coded JAVA macros...
The current study is dedicated to understanding the wake effects of rotating vertical axis wind turbine. It is achieved by using STAR-CCM+ on the HPC clusters at Cranfield University. A number of tools in STAR-CCM+ are applied, including the wake refinement technology, morphing motion and the rigid body motion, and different turbulence models are also employed. Results from different physics models and mesh schemes are compared. The blade force prediction shows very good agreement with the measurement. This initial wake study has provided a basis for the structural analysis of the vertical...
Flow in and after the industrial bends are quite important from the flow metering point of view. There is a wide-range of studies focusing on simulations of turbulent flows through curved pipes. For flow metering it is important to know and understand that how the flow develops after a disturbance. There is little information in the literature how the flow develops after such a disturbance. In the present study, we focus on the scaled resolved by a Large Eddy Simulation (LES) of an in-plane and out-of-plane bend at a relatively low Reynolds number 20,000. LES results served as a benchmark for...
There is an ever-increasing demand to couple simulation and experiments in order to understand complex systems. Extensive research has been conducted for simplified flares in well-controlled environments. However, experimental, as well as computational, studies of full-scale flares present great challenges when characterizing the effect of operational and environmental parameters on the combustion efficiency of full-scale systems. Often, for the full-scale flare studies, the experiments themselves, along with the instrumentation, can be very complex and expensive, and can be very difficult to...
For a new solar flat-plate collector, which is composed of plane glass plates, two aspects of the development are illustrated. Firstly, the fluid distribution is examined for the occurrence of the heat-carrier fluid in the space between the plates. Starting from a circular port a volumetric flow should be generated through the interspace between the panes. For this, different geometries are analyzed. The distribution is optimized with regard to the full-volumetric flow and the pressure loss. Secondly, the natural convection is examined between the panes of the insulating layers by using...
Full CFD/CHT calculations, even including additionally combustion, are today an important step in the design process of modern gas turbines. Based on comprehensive models a numerical testing of major components is today possible within reasonable time and detection of design deficiencies becomes possible in an early stage. Thus, it is possible to reduce the number of costly hardware testing steps. Major examples in the presentation deal with the topics of comprehensive calculations for pre-mixed can-type combustors and conjugate heat transfer analyses of complex cooled 1st stage vanes and...

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