About fourty years ago – according to (Rechenberg, 1994) – Rechenberg and Schwefel came up with the idea of evolution strategies for flow optimization. Since then advances in computer architectures and numerical algorithms have greatly decreased computational costs of realistic flow simulations, and today Computational Fluid Dynamics (CFD) is complementing flow experiments as a key guiding tool...

In this paper, we present a biomechanical framework to model airflow inside the bronchus and deformations across the tracheobronchial tree, pipeline for the simulator, theory and initial steps to realize this framework on a highly parallel graphical processing unit (GPU). We discuss the main challenges expected and encountered to date. By using computational fluid dynamics (CFD) and computation...

Computational Fluid Dynamics (CFD) simulations provide a variety of data mining challenges and present an opportunity for novel solutions. A core challenge is that CFD computations can require weeks of computation on expensive high performance clusters, delaying investigation of results until a fully converged solution is obtained. 21st Century Systems, Inc. and Brigham Young University have be...

Aortic root and valve clots are rare but well described in patients on maximal left ventricular assist device (LVAD) support. We performed a theoretical analysis using computational fluid dynamic analyses in two dimensions to try and ascertain if inflow cannula design/orientation/placement affect aortic root flow dynamics. Two-dimensional computational fluid dynamics using easy CFD-G was perfor...

Background Atherosclerotic coronary artery disease remains a major cause of illness and death, and coronary flow predetermines disease. Limitations in imaging technology prevent coronary flow measurements but computational fluid dynamics (CFD) need sophisticated boundary conditions for accurate flow predictions. MRI has recently been combined with CFD for larger calibre vessels, but small coron...

Simulations of the influence of contrast agent bolus dispersion on the shape of the contrast agent bolus and on quantification of myocardial blood flow (MBF) have been made using an exponential residue function model, and an computational fluid dynamics (CFD) approach. Based on the exponential residue function model, up to 20% underestimation of MBF appeared reasonable. CFD simulations showed t...

In this paper, the simulation of rolling piston compressor is established using Star-CD, a general computational fluid dynamics (CFD) software. Based on the result, the P-V diagram of compressor’s working process and all kinds of factors influencing the compressor’s overall efficiency are analyzed deeply, then several optimum projects are put forward in order to improve the compressor’s overall...

With the growth of available computational resource, CFD–DEM (computational fluid dynamics–discrete element method) becomes an increasingly promising and feasible approach for the study of sediment transport. Several existing CFD–DEM solvers are applied in chemical engineering and mining industry. However, a robust CFD–DEM solver for the simulation of sediment transport is still desirable. In t...

This paper reviews some of our recent applications of computational fluid dynamics (CFD) to model heat and mass transfer problems in neonatology and investigates the major heat and mass-transfer mechanisms taking place in medical devices, such as incubators, radiant warmers and oxygen hoods. It is shown that CFD simulations are very flexible tools that can take into account all modes of heat tr...

This paper highlights the importance of validating Computational Fluid Dynamics (CFD) results from a configuration as close as possible to the subject of our research and application. The validation allows us to optimize the choice of various CFD modeling parameters such as gas flow, grid resolution and solution methodology. The validation is based on comparison between our simulated results an...