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In surgery, tissue and organ bleeding is common and unavoidable. Adding bleeding simulation to virtual surgery can greatly improve the visual realism of the surgical environment, and can also train surgeons' reactions to surgical bleeding. Blood is a kind of viscous and incompressible liquid, and has unique mechanical properties due to the existence of platelets and other cells. The Navier-Stokes...
Accurate mathematical models especially accurate hydrodynamic parameters of unmanned underwater vehicles (UUVs) are essential for good control performance. This paper provides a general framework for the hydrodynamic modeling of a small-scale UUV. In place of physical experiments such as captive model tests, a virtual model test and simulation was conducted via commercial computational fluid dynamics...
Remote Operated Vehicles(ROV) play an important role in marine economic development, environmental protection and disaster management. This paper introduces the design procedure for the rudder wing of ROV used in marine shallow water areas. First of all, the wing selection of the rudder wing is chosen based on the maneuverability requirements of the ROV Secondly, the 3D model of the rudder wing is...
This This study aims to determine the optimal configuration for wall mounted mixers based on the comparison of computational fluid dynamics (CFD) modelling results to physical data collected from the treatment plant. The study was developing a CFD model of an anoxic zone-1 and simulating the fluid flow using ANSYS code 'Fluent'. A 2D model of an activated sludge process bioreactor anoxic zone was...
Autonomous underwater vehicles (AUV) are attractive platforms for many applications in the off-shore industry. The design and development of an AUV is an expensive and complex task. During the development of these vehicles both at the stage of physical design for construction, as in the stage of the navigation system design, it is critical to estimate and analyze the dynamic behavior of these vehicles...
In coastal semi-enclosed basins the knowledge about cleaning capacity of the system, related to the water transport and dilution process, can be crucial to decision makers in order of an aware management. This work aims to investigate the three-dimensional character of these transport time scales in the Taranto Seas (Apulia, Italy), through the application of a finite elements numerical model SHYFEM...
Sediment transport at the Yellow river delta is affected by many different factors, including tide, waves and river flows. With the change of river exit in 1996, a new delta is rapidly growing which leads to a new sediment transport regime. Most existing computer modelling work at the site is yet to take such changes into account. In addition, the wave action at the river mouth is often ignored in...
Conformation optimization and achieve resonation with wave are two key parts of designing pendulum wave energy converters. The object of this paper is to study hydrodynamics of a novel floating type pendulum wave energy converter and make optimization through full 3-D simulations. We will also conduct experiment in a wave tank to verify our simulations.
Marine oil spill is an inevitable and undesirable consequence of producing and transporting petroleum, as well as the associated refined products. To reduce oil spill pollution, China has made many great achievements to develop adequate pollution contingency plans for several years. During the oil spill response, it is important to understand the behavior and fate of spilled oil in the forecasting...
Long-term hemodialysis is frequently provided with an arteriovenous (AV) graft implanted into an extremity. The useful life of AV grafts is limited by the development of stenosis at or downstream from the venous anastomosis. A better understanding of graft hemodynamics may allow improved assessment of the risk of thrombosis. Jones et al (J Biomech Eng 2005, 127: 60-66) developed a model of pressure...
Simulations of the entire universe are by definition models of the largest and most complex physical system that exists. In carrying them out, simulators seek to discretize the matter (and radiation) in a model universe and follow their evolution from the Big Bang to the present day.
This paper describes the plans for a new information system to supply nowcasts and forecasts of current information for navigation to the Port of Rotterdam. The system will consist of both HF radar and a 3D hydrodynamic model. The currents measured by the HF radar will be assimilated into the 3D model to provide the best forecast.
The physical process modeling of an estuary is a complex mechanism that comes along with the existence of uncertainty. In contrast, due to significant variability of flows in space and time, an extensive modeling effort must be accommodated with the application of parallelization technology. Therefore, the implication of estuary model parallelization to the model result uncertainty must be examined...
National Research Council Canada (NRC) is collaborating with College of the North Atlantic (CNA) to develop an ocean wave-driven pump to supply the CNA shore-based aquaculture centre in Lord's Cove, Newfoundland. NRC provides a combination of physical model testing under controlled laboratory conditions and computer simulation using numerical modelling tools developed at NRC and commercial software...
Recently, active cooling system is strongly needed in high heat flux density microelectronics. Micropump is the essential component in the active cooling system. In this paper, a mechanical micropump is proposed for electronic cooling with a 2L/min flow rate, 90KPa pressure head at 22000 rpm (revolutions per minute). The overall size of the micropump prototype is 43mm in width and 65mm in length....
Two-DOF barycenter mechanism and its control are proposed. The mechanism by means of the moved balancing masses along two axes changes the center of gravity of fish's body. The projected torques on x and y axes propel pitch and roll angles to the desired values. Merging the pitching and rolling models with fish-tail and rigid-body models, the fish robot motion and maneuverability can be achieved in...
Fluid simulations have been used extensively as a way to add details to scenes in videogames and films, since manually creating the fluid's movement can be very costly. SPH is a method that uses particle systems and is commonly used for fluid simulations for its easy description and implementation. This work presents methods used for the simulation of a fluid, and how this fluid can interact with...
Wave energy converter research continues to advance and new developers are continuing to emerge, leading to the need for a general modeling methodology. This work attempts to outline the design methodology necessary to perform frequency domain analysis on a generic wave energy converter. A two-body point absorber representing a generic popular design was chosen and a general procedure is presented...
This paper discusses the hydrodynamic optimization of hull form mainly. The study has been carried out using an integrated tool for hydrodynamic optimization, incorporating a CAD modeler for definition and parametric modification of hull forms, CFD codes for the evaluation of hydrodynamic performance and software for optimization and decision making. A study includes the geometric modeling, hydrodynamic...
This paper describes numerical methods for a four-moments quantum energy transport(QET) model, which is derived by using a diffusion scaling in the quantum hydrodynamic model. Space discretization is performed by a new set of unknown variables. Numerical stability and convergence are obtained by developing an iterative solution method with a relaxation method. Numerical results in a scaled MOSFET...
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