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The increasing demand from consumers for newer, cheaper and more efficient products is increasingly influencing the way products are designed and produced. Virtual manufacturing processes are recognized to be part of the solution to deliver better products. This goes also for casted goods. To accommodate the ever changing demands for a casting the simulation methods have to evolve as well. This means expanding the simulation scope both in terms of the complexity of the replicated boundary conditions and processes as well as the detail in which physical modelling is done. An overall...
Heat exchangers for the climatization and the thermal management of passenger cars and trucks undergo corrosion tests within their development process. Corrosion tests, like the well known Sea Water Acetic Acid Test (SWAAT-Test), are performed by spraying salt water on the heat exchangers within a corrosion test chamber. This test process inside a corrosion test chamber is simulated at MAHLE Behr using STAR-CCM+. The geometry of the corrosion chamber has been built up virtually in STAR-CCM+ including a variable load scenario (of heat exchangers) of the test chamber. The transport of the spray...
The flow of molten steel and the behavior of non-metallic inclusions inside the 6-Strand Tundish at Georgsmarienhütte GmbH were investigated. Considering that water models are generally accepted in supporting validation of CFD simulations, a scaled model of the Tundish was built. The water flow and the non-metallic inclusions behavior are compared with CFD simulation results. A VOF simulation with extreme density ratio (liquid water, air) was performed. The Eulerian Multiphase model and the Volume of Fluid model were implemented to calculate the behavior of water and air. The Lagrangian...
The numerical simulations realised by biomechanical engineers have been evaluated with a certain precaution by clinicians and surgeons. On the other hand, time-consuming nature of our simulations is another reason why they keep us far from thier operation rooms. The objective of the current work is to present the results of several numerical simulations of pulsatile blood flow in healthy and diseased arteries and compare with clinical expectations. Different realistic and physiological aspects such as blood flow interaction with arterial walls, effect of heart movement, cardiovascular...
In recent years, cement-retained dental implant restoration (as opposed to screw-retained restoration) has seen a significant increase in popularity by virtue of its improved aesthetics, cost-effectiveness and reduced chair time. Although it is now common place for dentists to apply this method, excess extrusion of cement into the soft tissue surrounding the implant has been shown to cause long-term peri-implant disease when using this approach. Unfortunately, limited data are available to help understand how to achieve optimal cementation to avoid these health issues by controlling the...
The lymphatic system is an important vascular network that plays a vital role in physiologic function. The lymphatics are generally tubular vessels segmented by bi-leaflet valves. These vessels are small (~100 µm diameter) with low flow-rates, making them a challenge to investigate experimentally. Their resistance to flow, an important parameter in determining pumping function, is thus extremely difficult to estimate. We are thus constructing computational fluid and solid mechanics models of lymphatic valves to facilitate a more complete characterisation. Idealised Geometry : Confocal images...
The new high tech operating room at the Technical University of Applied Sciences Amberg-Weiden acts as a reference center for innovative technologies and their practical application in, most especially, the area of minimal invasive surgery. In addition to the aspects of work flow and efficiency the focus on placed on air-conditioning and airflow close to the surgical areas. Inside the framework of CFD analysis, many studies have been conducted concerning the fundamental understanding about air and temperature control. For example, the movement of personnel in the operation area can be...
In the last few years several academic works have tested different simulation tools in order to understand the cause behind the rupture of aneurysms. However, these tools have limited or no impact on patients’ treatment. Due to this, the present work aims at developing a rule-based virtual automated process to aid Abdominal Aorta Aneurysm (AAA) diagnosis, which is useful in consequent treatment. Computational Fluid Dynamics (CFD) is the main tool employed to support the decision making process and the final therapy. So, CFD modeling is the main part of the entire workflow, which starts from...
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 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. The resulting circulation after this procedure is complex and detailed hemodynamics have yet to be fully understood. To this end, a multiscale model of the entire circulatory system...
The presentation will demonstrate the use of STAR-CCM+ to help develop a new type Charge Air Cooler (CAC) for heavy duty off-highway applications. A fin-tube type cross flow CAC requires very small mesh size in CFD model to capture its fin geometric characteristics and resolve the thermal boundary layer. Hundreds of millions of cells may be generated in the CFD model for a Conjugated Heat Transfer (CHT) study of the whole CAC unit, which will then require huge computing resources and make the CFD study very inefficient. The single and dual stream heat exchanger models in STAR-CCM+ require the...

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