Hydrated Layer Formation on Tricalcium and Dicalcium Silicate Surfaces: Experimental Study and Numerical Simulations

Langmuir ◽  
2001 ◽  
Vol 17 (26) ◽  
pp. 8131-8138 ◽  
Author(s):  
Sandrine Garrault ◽  
André Nonat
Keyword(s):  
Experimental Study ◽  
Numerical Simulations ◽  
Dicalcium Silicate ◽  
Layer Formation ◽  
Hydrated Layer

Hydrated-layer formation during dissolution of complex silicate glasses and minerals

1990 ◽  
Vol 54 (7) ◽  
pp. 1941-1955 ◽  
Author(s):  
J.-C Petit ◽  
G.Della Mea ◽  
J.-C Dran ◽  
M.-C Magonthier ◽  
P.A Mando ◽  
...  
Keyword(s):  
Silicate Glasses ◽  
Layer Formation ◽  
Hydrated Layer

Nonlinear dynamics of the elliptic instability

2010 ◽  
Vol 646 ◽  
pp. 471-480 ◽  
Author(s):  
NATHANAËL SCHAEFFER ◽  
STÉPHANE LE DIZÈS
Keyword(s):  
Nonlinear Dynamics ◽  
Numerical Simulations ◽  
Shear Layer ◽  
Rapid Growth ◽  
Vortex Core ◽  
Nonlinear Evolution ◽  
Core Size ◽  
Layer Formation ◽  
Vortex Loop ◽  
Weakly Nonlinear

In this paper, we analyse by numerical simulations the nonlinear dynamics of the elliptic instability in the configurations of a single strained vortex and a system of two counter-rotating vortices. We show that although a weakly nonlinear regime associated with a limit cycle is possible, the nonlinear evolution far from the instability threshold is, in general, much more catastrophic for the vortex. In both configurations, we put forward some evidence of a universal nonlinear transition involving shear layer formation and vortex loop ejection, leading to a strong alteration and attenuation of the vortex, and a rapid growth of the vortex core size.

Numerical simulations and experimental study of terahertz photoconductive antennas based on GaAs and its ternary compounds

2018 ◽  
Author(s):  
Denis V. Lavrukhin ◽  
Alexander E. Yachmenev ◽  
Rinat R. Galiev ◽  
Igor A. Glinskiy ◽  
Rustam A. Khabibullin ◽  
...  
Keyword(s):  
Experimental Study ◽  
Numerical Simulations ◽  
Photoconductive Antennas ◽  
Ternary Compounds

Experimental study and numerical simulations of a plasma relativistic microwave amplifier

2010 ◽  
Vol 36 (9) ◽  
pp. 762-771 ◽  
Author(s):  
I. L. Bogdankevich ◽  
I. E. Ivanov ◽  
P. S. Strelkov
Keyword(s):  
Experimental Study ◽  
Numerical Simulations ◽  
Microwave Amplifier

Experimental Study of Very Low Aspect Ratio Wings in Slender Bodies

2012 ◽  
Author(s):  
M. A. Arevalo-Campillos ◽  
S. Tuling ◽  
L. Parras ◽  
C. del Pino ◽  
L. Dala
Keyword(s):  
Experimental Study ◽  
Aspect Ratio ◽  
Numerical Simulations ◽  
Water Channel ◽  
Vortex Sheet ◽  
The Body ◽  
Low Aspect Ratio ◽  
Moderate Reynolds Number ◽  
Slender Bodies ◽  
Low Aspect Ratio Wings

The dynamics of very low aspect ratio wings (or strakes) vortices in slender bodies are complex due to the interaction of the shed vortex sheet and the body vortex. For missiles at supersonic speeds these interactions are not easily predicted using engineering level tools. To shed some new light onto this problem, an experimental study in a water channel for moderate Reynolds number (Re = 1000) was performed for a 19D body and strake configuration with strakes having a span to body diameter ratio of 1.25. Comparisons to numerical simulations in supersonic flow are also performed. Flow visualisation has been carried out to characterize the vortex dynamics at different angles of attack; these being 11°, 16°, 22° and 27°. The comparison between a slender body without strakes and the body-strake configuration has given some key indicators in relation to the vortex position of the core. Furthermore, unsteady wing-body interference has been observed at angles of attack above 20° for both experimental and numerical simulations. Consequently, the average position of the vortex core is located at larger distances from the missile in comparison to the body without strakes. The numerical simulations show good correlation with the experimental tests even though the dynamic convective interactions between the body vortex and strake vortex sheet are not predicted.

Parameters deduced from the pressuremeter test

2002 ◽  
Vol 39 (6) ◽  
pp. 1333-1340 ◽  
Author(s):  
A Fawaz ◽  
M Boulon ◽  
E Flavigny
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Numerical Simulations ◽  
Fine Sand ◽  
Numerical Results ◽  
Pressuremeter Test ◽  
The Relationship ◽  
Pressuremeter Modulus

This paper presents a study of the pressuremeter test and the results that can be obtained from this test. Hostun's fine sand was chosen as the material upon which to perform the experimental study of the pressuremeter. Numerical simulations of the pressuremeter tests have been made with the commercially available PLAXIS software. The numerical results have been compared with the experimental ones. The variation of the parameters resulting from an applied surcharge was studied experimentally and numerically. Finally, the relationship between the magnitude of the deformation and the pressuremeter modulus was analyzed.Key words: sand, pressuremeter, triaxial, pressure, modulus, deformation, numerical simulation.

Rotational Compliance Measurements of a Flexible Plane Structure Using an Attached Beam-like Tip, Part 2: Experimental Study

1997 ◽  
Vol 119 (4) ◽  
pp. 603-608 ◽  
Author(s):  
Y. C. Qu ◽  
L. Cheng ◽  
D. Rancourt
Keyword(s):  
Experimental Study ◽  
Error Analysis ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Companion Paper ◽  
Experimental Measurements ◽  
Frequency Range ◽  
Experimental Assessment ◽  
Different Types ◽  
Modal Behavior

This paper presents an experimental assessment of the Tip Excitation Technique (TET) introduced in a companion paper. The aim of the technique is to measure the rotational compliance of attached plane structures. Following the guidelines established on the basis of a numerical study in the companion paper, experimental measurements were performed on a rectangular plate and results were compared with numerical simulations. The investigation focuses on the general performance of the technique, on the different types of excitation used and on other factors necessary to ensure accurate results. In addition, an error analysis is conducted to demonstrate the sensitivity of the results to biased measurement quantities. It is concluded that the proposed technique can be used in the low to middle frequency range, where relatively strong modal behavior is involved.

Sign in / Sign up

Export Citation Format

Share Document