A recently developed numerical method for flows with moving boundaries is used for simulating the flow-induced vibration of cylinders. The key feature of the numerical method is that it allows us to simulate flows with moving boundaries on stationary Cartesian grids. The key features of the method are described. The method is used to simulate (a) transverse flow-induced vibration of a cylinder ...

The present paper investigates the advantages of a new class of composite grid structures over conventional grids. Thus far, a known grid structure such as orthogrid or isogrid has been used as an orthotropic layer with at most in-plane anisotropy. The present laminated grid is composed of various numbers of thin composite grid layers. The stiffness of the structure can be adjusted by choosing ...

Staggered grid Lagrangian schemes for compressible hydrodynamics involve a choice of how internal energy is advanced in time. The options depend on two ways of defining cell volumes: an indirect one, that guarantees total energy conservation, and a direct one that computes the volume from its definition as a function of the cell vertices. It is shown that the motion of the vertices can be defin...

abstract: in this paper a control scheme for grid-connected operation mode and the island state of distributed generation is presented. in normal conditions, every inverter dg system in micro-grids to supply a preset power, normally operate in a constant current control mode. when micro-grids removed from the network, dg inverter of each system must recognize the island and change position to v...

. The paper presents the results of experimental studies hydrodynamics coolant in core PWR reactor with fuel assemblies “TVS-Kvadrat” various designs. Experimental consisted studying velocity fields and process cross-flow between adjacent designs homogeneous mixed cores on large-scale models, including fragments two a gap them. test models differ number installed grids, this is due to fact that...

Abstract We present an approach for solving the inverse kinematic problem of seismic with internal sources, based on method multidimensional data approximation irregular grids. The times arrival elastic waves to stations are considered as known. hodographs from earthquake approximated further determining velocities longitudinal and transverse using eikonal equation. ratio these determines Poiss...

existed electricity grids deliver produced power to the consumer passing through transmission and distribution grids. According to high losses of these grids in transmission level and inexistence of bilateral interaction for simultaneous information exchange, a concept of smart grids were made by capabilities such as consciously participation of consumers in the smart electricity grids, an amou...

For reliability-based topology optimization (RBTO) of double layer grids, a two-stage optimization method is presented by applying “Solid Isotropic Material with Penalization” and “Ant Colony Optimization” (SIMP-ACO method). To achieve this aim, first, the structural stiffness is maximized using SIMP. Then, the characteristics of the obtained topology are used to enhance ACO through six modific...

Fuel elements (fuel rods) and spacer grids are the main of fuel assembly a nuclear reactor. Friction forces affect strength at all stages its life cycle. The paper presents methods results pre-reactor experimental studies static dynamic processes involving friction forces. These include manufacturer’s factory, hydrodynamic vibration rods fretting corrosion in “fuel cell” nodes spacing grid, mov...

varicella-zoster viruses complications involving the cns are estimated to occur rarely, transverse myelitis after varicella-zoster virus in most patients is characterized by an abrupt onset of progressive weakness and sensory disturbance in the lower extremities , like other viruses. we describe the case of 17 year-old boy who experienced cervical transverse myelitis after chickenpox with inabi...