Constantinescu, George

Overview
Works: 27 works in 32 publications in 4 languages and 50 library holdings Author, Thesis advisor, Editor, Translator
Publication Timeline
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Most widely held works about George Constantinescu

Most widely held works by George Constantinescu
Improved method for determining wind loads on highway sign and traffic-signal structures by George Constantinescu( Book )

1 edition published in 2007 in English and held by 6 WorldCat member libraries worldwide

The main objective of the proposed study is to use computational Fluid Dynamics (CFD) tools to determine the wind loads by accurate numerical simulations of air flow characteristics around large highway sign structures under severe wind speeds conditions. Fully three-dimensional Reynolds-Averaged Navier-Stokes (RANS) simulations are used to estimate the total force on different panels, as well as the actual pressure distribution on the front and back faces of the panels. In particular, the present study investigates the effects of aspect ratio and sign spacing for regular panels, the effect of sign depth for the dynamic message signs that are now being used on Iowa highways, the effect induced by the presence of back-to-back signs, the effect of the presence of add-on exit signs, and the effect of the presence of trucks underneath the signs potentially creating "wind tunnel" effect
Evaluation of bridge scour research : pier scour processes and predictions by R Ettema( )

1 edition published in 2011 in English and held by 6 WorldCat member libraries worldwide

This report explores the current state of knowledge regarding bridge pier scour, assesses several methods for design estimates of scour depth, examines a structured methodology for scour depth estimation for design purposes, and highlights aspects of pier scour in need of potential further research
Computational fluid dynamics model for pump-bay flow : documentation and user guide( Book )

2 editions published in 1997 in English and held by 5 WorldCat member libraries worldwide

Exploatări, transporturi şi construcţii forestiere by Gh. T Ionascu( Book )

2 editions published between 1987 and 1988 in Romanian and held by 2 WorldCat member libraries worldwide

Numerical study of the flow field at cylindrical piers in an alluvial bed by Gokhan Kirkil( )

1 edition published in 2008 in English and held by 2 WorldCat member libraries worldwide

Ştiinţa sonică by George Constantinescu( Book )

2 editions published in 1920 in Undetermined and Romanian and held by 2 WorldCat member libraries worldwide

Teoria sonicităţii by George Constantinescu( Book )

1 edition published in 1985 in Romanian and held by 2 WorldCat member libraries worldwide

Evaluation of bridge scour research : pier scour processes and predictions by R Ettema( Book )

1 edition published in 2011 in English and held by 2 WorldCat member libraries worldwide

George Constantinescu by Ionel Jianu( Book )

1 edition published in 1966 in Romani and held by 1 WorldCat member library worldwide

Lock-exchange gravity currents propagating in a channel containing an array of obstacles( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

Abstract: Large eddy simulation (LES) is used to investigate the evolution of Boussinesq gravity currents propagating through a channel of height $H$ containing a staggered array of identical cylinders of square cross-section and edge length $D$ . The cylinders are positioned with their axes horizontal and perpendicular to the (streamwise) direction along which the lock-exchange flow develops. The effects of the volume fraction of solids, ${\it\phi}$, the Reynolds number and geometrical parameters describing the array of obstacles on the structure of the lock-exchange flow, total drag force acting on the gravity current, front velocity and global energy budget are analysed. Simulation results show that the currents rapidly transition to a state in which the extra resistance provided by the cylinders strongly retards the motion and dominates the dissipative processes. A shallow layer model is also formulated and similarity solutions for the motion are found in the regime where the driving buoyancy forces are balanced by the drag arising from the interaction with the cylinders. The numerical simulations and this shallow layer model show that low-Reynolds-number currents transition to a drag-dominated regime in which the resistance is linearly proportional to the flow speed and, consequently, the front velocity, $U_{f}$, is proportional to $t^{-1/2}$, where $t$ is the time measured starting at the gate release time. By contrast, high-Reynolds-number currents, for which the cylinder Reynolds number is sufficiently high that the drag coefficient for most of the cylinders can be considered constant, transition first to a quadratic drag-dominated regime in which the front speed determined from the simulations is given by $U_{f}\sim t^{-0.25}$, before undergoing a subsequent transition to the aforementioned linear drag regime in which $U_{f}\sim t^{-1/2}$ . Meanwhile, away from the front, the depth-averaged gravity current velocity is proportional to $t^{-1/3}$, a result that is in agreement with the shallow water model. It is suggested that the difference between these two is due to mixing processes, which are shown to be significant in the numerical simulations, especially close to the front of the motion. Direct estimation of the drag coefficient $C_{D}$ from the numerical simulations shows that the combined drag parameter for the porous medium, ${\it\Gamma}_{D}=C_{D}{\it\phi}(H/D)/(1-{\it\phi})$, is the key dimensionless grouping of variables that determines the speed of propagation of the current within arrays with different $C_{D}, {\it\phi}$ and $D/H$
A numerical method for large-eddy simulation in complex geometries by K Mahesh( )

1 edition published in 2004 in English and held by 1 WorldCat member library worldwide

Lucrări stiintifice : institutul de cercetári horti-viticole( Book )

1 edition published in 1961 in Romanian and held by 1 WorldCat member library worldwide

Ampelografia Republicii populare Romane = (Ampelographie der Rumaenischen Volksrepubliek( Book )

in Romanian and held by 1 WorldCat member library worldwide

A LES study on gravity currents propagating over roughness elements by Talia Ekin Tokyay( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

The simulations provide detailed information on the temporal evolutions of the front velocity, energy balance, sediment entrainment capacity and the flow instabilities, and of the distributions of the density, velocity, local dissipation rate and bed shear stresses at different stages of the propagation of the gravity current. The study investigates of the effect of the shape and relative size of the obstacles, with respect to the current height, on the structure of the current and on the differences with the simpler, but much more widely studied case of a gravity current propagating over a flat smooth surface. For example, the simulation results are used to explain why gravity currents propagating over dunes have a much larger capacity to entrain sediment than gravity currents propagating over ribs of the same height and with similar spacing. The accurate estimation of impact of gravity current on the structures over its path is very important from engineering point of view since many submerged cables over the ocean bottom or submerged dams in reservoirs are under the risk of such impacts. The simulations of gravity currents propagating past arrays of ribs or isolated dams are used to estimate the characteristic times and magnitudes of the hydrodynamic impact forces on these obstacles. This information is crucial for the proper design of these structures. The study shows the critical role played by flow disturbances (e.g., backward propagating hydraulic jumps) that form as a result of the interaction between the current and the large-scale obstacles. Finally, the study investigates scale effects between the Reynolds numbers at which most experimental investigations of gravity currents are conducted and Reynolds numbers at field scale
Raionarea viticulturii by Gherasim Constantinescu( Book )

1 edition published in 1958 in Romanian and held by 1 WorldCat member library worldwide

De barrevoeters by Zaharia Stancu( Book )

1 edition published in 1950 in Dutch and held by 1 WorldCat member library worldwide

Ampelografia Republicii Socialiste Romania by O Alexei( Book )

in Romanian and held by 1 WorldCat member library worldwide

Exploatări, transporturi şi construcţii forestiere by Gh. T Ionascu( Book )

1 edition published in 1988 in Romanian and held by 1 WorldCat member library worldwide

Ampelografia Republicii Populare Romine by Gherasim Constantinescu( Book )

1 edition published in 1962 in Romanian and held by 1 WorldCat member library worldwide

Annual Research Briefs - 2001 (Center for Turbulence Research)( )

1 edition published in 2001 in English and held by 1 WorldCat member library worldwide

This report contains the 2001 Annual Progress Reports of the postdoctoral fellows and visiting scholars of the Center for Turbulence Research. In 2001 CTR sponsored 15 resident Postdoctoral Fellows, 7 Research Associates and 3 Senior Research Fellows, hosted 7 visiting scholars and many shorter-term visitors, and supported 6 doctoral students. Most of the doctoral students engaged in turbulence research at CTR are supported by the U.S Office of Naval Research or the Air Force Office of Scientific Research. CTR is closely associated with the Stanford multidepartmental Center for Integrated Turbulence Simulations (CITS), funded by the Department of Energy's Accelerated Strategic Computing Initiative (ASCI). The aim of the CITS program is to compute the complete flow through an aircraft gas turbine engine. The combustion chamber is the most critical region: it is typically of very complicated geometrical shape, and the fuel is introduced as a spray of droplets which must disperse and vaporize before burning. The first paper in this volume describes large-eddy simulation of the air flow in a real aircraft gas turbine combustor, and there are several papers relevant to the crucial problem of spray combustion

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Related Identities
Alternative Names
Constantinesco, Gogu 1881-1965

Constantinesco, Gogu George, 1881-1965

Constantinescu, G.

Constantinescu, G. 1881-1965

Constantinescu, George.

Constantinescu, George 1881-1965

Constantinescu, Gogu 1881-1965

Constantinescu, Gogu George, 1881-1965

George Constantinescu ingeniero rumano

George Constantinescu ingénieur roumain

George Constantinescu Romanian engineer

George Constantinescu ruimteingenieur uit Roemenië (1881-1965)

Джордже Константинеску

Languages
Romanian (13)

English (11)

Dutch (1)

Romani (1)