A benchmark turbulent Backward Facing Step (BFS) airflow was studied in detail through a program of tightly coupled experimental and CFD analysis. The theoretical and experimental approaches were developed simultaneously in a “building block” approach and the results used to verify each “block”. Information from both CFD and experiment was used to develop confidence in the accuracy of each tech...

Computational researchers typically work by accessing a compute resource miles from their desk. Similarly, their simulation output or other data is stored in remote terabyte data servers. VisBench is a component-based system for visualizing and analyzing this remote data. A time-varying CFD simulation of heat exchange over a louvered n provides sample data to demonstrate a workbench-oriented ve...

Obtaining reliable CFD predictions of the bronchial flow that reflects the actual flow within a living lung requires the development of a deforming airways model, and the imposition of physiological subject-specific boundary conditions. This thesis addresses these two issues by the development of dynamic CFD models of the bronchial airways using a dynamic CT data set covering the breathing cycl...

BACKGROUND Understanding hemodynamic environment in vessels is important for realizing the mechanisms leading to vascular pathologies. OBJECTIVES Three-dimensional velocity vector field in carotid bifurcation is visualized using TR 3D phase-contrast magnetic resonance imaging (TR 3D PC MRI) and computational fluid dynamics (CFD). This study aimed to present a qualitative and quantitative comp...

The objective of the present study is to perform thermal analysis for the design of a complex electronic cabinet used as a high speed internet subscriber device. The novelty of the paper lies in the approach used for analysis of the flow distribution in the system of interest. It utilizes Flow Network Modeling (FNM) and Computational Fluid Dynamics (CFD) in a complementary and interactive manne...

The redox behavior for bulk and nano silver nitrate (NSN) were studied by cyclic voltammetry technique in absence and presence of cefdinir antibiotic (CFD) using glassy carbon electrode (GCE) in 0.1 M KNO3 as supporting electrolyte at two different temperatures. Scan rates were studied for the redox reactions of bulk and nano silver nitrate (NSN) in absence and presence of cefdinir antibiotic (...

There are many flows fields that span a wide range of length scales where regions of both rarefied and continuum flow exist and neither direct simulation Monte Carlo (DSMC) nor computational fluid dynamics (CFD) provide the appropriate solution everywhere. Recently, a new viscous collision limited (VCL) DSMC technique was proposed to incorporate effects of physical diffusion into collision limi...

The self-noise generated by a sharp-edged strut immersed in low Mach number flow is predicted using a hybrid computational fluid dynamics (CFD) boundary element method (BEM) technique. The fluctuating flow field is obtained using an incompressible CFD solver. A high-order reconstruction scheme is used to extract acoustic sources based on Lighthill’s analogy from the flow field data. Acoustic wa...

In the field of screw compressors, although the basic operation of flow systems is well known and the analytical methods for their performance prediction are well established, only few attempts of investigating the flow by means of CFD can be identified in the available literature. In this paper, two important aspects of numerical investigation of the flow behavior are presented. Firstly, metho...

This study proposes a procedure for a risk analysis for leakages of flammable refrigerants into a poorly ventilated three-dimensional space. It also presents several test cases of risk analyses on flammability and ignitions to a leaked refrigerant. Concentration of a leaked flammable refrigerant at a leakage window, Cin, is determined by mass balance, providing information on the capacity of an...