The safety of underwater operation depends on the accuracy its speed logs which location probe and calibration thoroughness. Thus, probes are placed in areas where flow water is smooth, continuous, without high velocity gradients, air bubbles, or vortical structures. In present work, around two different submarines numerically described deep-water near-surface conditions to identify hull zones ...

Abstract Power generation from intermittent renewable energy resources (e.g. wind, solar) requires regulation of the electric grid. Although most hydraulic turbines are designed to work in their best efficiency points, nowadays they being used more often under varying operating conditions stabilize Unstable and fluid flow during transient operation cause significant pressure fluctuations load v...

The objective of the paper is a numerical study of heat transfer between perforated metal plates and the surrounding air flows. Different perforation structures can nowadays be found in various industrial products. Besides improving the mechanical properties, the perforations can intensify the heat transfer as well. The heat transfer coefficient depends on a wide range of parameters such as typ...

In this paper, we report on the design, simulation, and experimental analysis of a miniaturized device that can generate multiple circulated jet flows. The device is actuated by a lead zirconate titanate (PZT) diaphragm. The flows in the device were studied using three-dimensional transient numerical simulation with the programmable open source OpenFOAM and was comparable to the experimental re...

A comparative performance analysis of the CFD platforms OpenFOAM and FLOW-3D is presented, focusing on a 3D swirling turbulent flow: a steady hydraulic jump at low Reynolds number. Turbulence is treated using RANS approach RNG k-ε. A Volume Of Fluid (VOF) method is used to track the airewater interface, consequently aeration is modeled using an EulerianeEulerian approach. Structured meshes of c...

Cavitation is mostly unwanted in applications due to its unpredictable and distorting effect on fluid flow. On the other hand, modelling expensive terms of time computational power general. Regarding this a tendency for using an open source software such as OpenFOAM emerging promising tool both predicting analyzing cavity formation. With tool, effective reduction license expenses obtained. In s...

A main problem raised by arc welding manufacturing is the determination of the optimal process parameters to ensure weld quality as well as resource efficient and sustainable production. To address this problem a better process understanding is required. In this study thermal magneto hydrodynamic modeling of a welding arc is used to reach a deeper insight into the influence of the composition o...

2 Wei Liu, Qingyan Chen* 3 4 a School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA; 5 b School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, 6 China 7 8 This investigation studied an adjoint method to achieve the optimal design of ventilation in 9 an enclosed environment and validated it with two, two-dimensional cases. A part of th...

ORGANOHALOGEN COMPOUNDS – Volume 66 (2004) 138 Introduction Polyurethane foam (PUF) samplers are being used in an increasing number of studies to passively sample semivolatile organic compounds (SOCs) in the atmosphere (e.g. 1, ). However, recent research shows that the uptake and loss kinetics of passive air samplers is influenced by changes in wind speed . According to theory, the rate of che...