Reynolds Averaged Navier Stokes (RANS) models represent the workhorse for studying turbulent flows in industrial applications. Such single-point turbulence models have limitations in accounting for the influence of the non-local physics and flow history on the evolution of the turbulent flow. In this context, we investigate the sensitivity inherent to single-point models due to their characteri...

Taking an information-processing view of organizations, we address the need for building a robust set of performance measures for Edge Organizations (EOs). Alberts and Hayes in Power to the Edge: Command, Control in the Information Age conceptualized EOs as informationintensive entities whose performance is directly related to their ability for agile information processing. We ask the question,...

Algebraic multi-zone infiltration models (e.g. COMIS, CONTAM) have been developed to predict air flows and contaminant transport in complex buildings. However these models assume that each building zone is a well-mixed volume. This assumption is not appropriate to model large indoor spaces. We describe two simplified approaches, called zonal methods, to describe air flows in large indoor spaces...

An entirely new approach to the large-eddy simulation (LES) of high-speed compressible turbulent flows is presented. Subgrid scale stress models are proposed that are dimensionless functions of the computational mesh size times a Reynolds stress model. This allows a DNS to go continuously to an LES and then a Reynolds-averaged Navier-Stokes (RANS) computation as the mesh becomes successively mo...

Estimation of intersection turning movements is one of the key inputs required for a variety of transportation analysis, including intersection geometric design, signal timing design, traffic impact assessment, and transportation planning. Conventional approaches that use manual techniques for estimation of turning movements are insensitive to congestion. The drawbacks of the manual techniques ...

This paper deals with the assessment of accuracy of simulation models from the perspective of dynamic object flows. Dynamic objects (also called temporary entities or transactions) move physically or logically from one model component to another and represent entities such as aircraft, data packet, passenger, and vehicle. Accurate flow (movement) of thousands or millions of dynamic objects with...

Dead wood biomass can be a substantial fraction of stored carbon in forest ecosystems, and coarse woody debris (CWD) decay rates may be sensitive to climate warming. We used an elevation gradient in Colorado Rocky Mountain subalpine forest to examine climate and species effects on dead wood biomass, and on CWD decay rate. Using a new radiocarbon approach, we determined that the turnover time of...

in recent years, many different methods have been developed to simulate free surface flows coupled with moving bodies. in this paper, for simulating ship maneuver, vof method (cicsam) and also for coupling velocity field and pressure a fractional step method are used. to increase simulation accuracy, the mesh size should be significantly fine. unfortunately, fine grid causes increase in simulat...