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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...
Conjugate Heat Transfer analysis is performed on a split phase induction motor with internal fan-driven air-cooled topology by using the electromagnetic losses computed in SPEED and mapping them onto the real-world 3-D geometry in STAR-CCM+. Temperature dependent copper losses (I^2R) are modeled in both the stator winding and the aluminium rotor squirl cage. Simulation and measured temperatures are compared to show accuracy of this process. An improved, "vented" stator geometry is swapped into the STAR-CCM+ simulation to determine the potential impact of this design change upon the machine's...
Thermal protection is an important task in the development process of Mercedes Benz. Therefore a combination of heat exchangers and fans are applied for engine cooling. In some cases the set-up of fan and heat exchangers can cause a flow field, in which the temperature and velocity are strongly non-homogeneous in front of the engine fan. Under these conditions the thermal behaviour of the axial fan cannot be simulated in a proper way with the commonly applied quasi-steady Multiple Reference Frame model (MRF). For a reliable prediction of the thermal behaviour unsteady numerical simulations or...
MAHLE Behr has developed a standardized workflow for simulating a virtual Temperature Cycle Test (TCT). This test is an integral part in the development process of indirect Charge Air Coolers (iCAC) and Exhaust Gas Recirculation coolers (EGR). Within this test, the cooler is charged with an alternating high and low heat load by varying the hot gas temperature and mass flow rate. The transient CFD simulation is performed with STAR-CCM+ to model the flow of the fluids inside the cooler, the convective heat transfer between the fluids and the solid and the heat conduction within the solid. The...
In a passenger vehicle it is essential the ventilation system is designed to deliver air at the correct flow and temperature levels to keep the occupants comfortable. To create such an environment it is essential the climate control system is designed correctly to meet the demands of cooling and warming up of the cabin. To be able to design such systems with shortened vehicle programme times and reduced number of early physical prototypes, virtual simulations are required. The simulations must be able to predict accurately the flow and thermal behaviour through the ventilation system and into...
In engines destined for use in Mercedes-Benz passenger cars, the phasing of the camshafts is regulated with hydraulic cam phasers. New engine applications in conjunction with higher expectations relating to the performance of the adjustment increasingly require the optimization of the oil circulation in the system. The cam phasers currently used work on the swivel-vane/swivel-motor principle. The system to be simulated includes the oil circulation in the camshaft bearings, the central valve integrated in the adjuster and the adjuster with hydraulic lock. The tasks to be resolved in order to...

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