scholarly journals AN INCLINED-PLATE WAVE GENERATOR

1978 ◽  
Vol 1 (16) ◽  
pp. 21
Author(s):  
Frederick Raichlen ◽  
Jiin-Jen Lee
Keyword(s):  
Numerical Method ◽  
Wave Length ◽  
Experimental Results ◽  
Length Ratio ◽  
Constant Depth ◽  
Inclined Plate ◽  
Plate Wave ◽  
Wave Generator ◽  
Good Agreement

A numerical method for determining the characteristics of waves generated by a hinged inclined-plate wave generator operating in a constant depth channel is discussed. The analysis is in reasonably good agreement with experimental results. The results indicate the sloping generator operating under certain conditions is completely inefficient, i.e., for a given stroke and depth-to-wave-length ratio, very small waves are produced; for other wave periods for the same conditions significantly larger waves are generated.

scholarly journals Numerical Method for Fuel Distribution Downstream of the Emulsifying Channel Injector

1985 ◽  
Author(s):  
Liu Bing ◽  
Wang Hong-Ji
Keyword(s):  
Differential Equation ◽  
Numerical Method ◽  
Calculation Model ◽  
Experimental Results ◽  
Two Dimensional ◽  
Physical Processes ◽  
Mixture Formation ◽  
Fuel Distribution ◽  
Good Agreement

Based upon experimental results, the physical processes of fuel-air mixture formation downstream of the emulsifying channel injector (ECI) have been studied and a calculation model for predicting fuel distribution downstream of ECI has been proposed in this paper. The two-dimensional differential equation of diffusion is solved by numerical method and the fuel distribution downstream of ECI is calculated. The calculated values are in good agreement with the experimental results.

THE E-PLANE RADIATION PATTERN OF SHORT ELECTROMAGNETIC HORNS OF LARGE APERTURE

1947 ◽  
Vol 25a (6) ◽  
pp. 315-321 ◽  
Author(s):  
G. A. Woonton ◽  
J. G. Tillotson
Keyword(s):  
Electromagnetic Field ◽  
Diffraction Pattern ◽  
Radiation Pattern ◽  
Wave Length ◽  
Angular Position ◽  
Fresnel Diffraction ◽  
Experimental Results ◽  
Electric Vector ◽  
Theoretical Predictions ◽  
Good Agreement

The relation between the power received by a short, rectangular, electromagnetic horn, and its angular position in a plane electromagnetic field can be calculated, for rotation in the plane of the electric vector, from ordinary optical theory by assuming that the aperture produces at the throat a Fresnel diffraction pattern appropriate to the angular position of the aperture. Experimental results for four horns of slant lengths 25, 50, 100, and 176 cm., but all of the same aperture, 10λ to a side at a wave length of 3.2 cm., are in good agreement with the theoretical predictions at angles up to [Formula: see text] radian from the axis, for slant lengths down to 50 cm. but not down to 25 cm.

Added Resistance CFD Analysis of the KVLCC2 With the Naval Hydro Pack

2019 ◽  
Author(s):  
V. Vukčević ◽  
I. Gatin ◽  
G.-H. Kim ◽  
H. Jasak
Keyword(s):  
Open Source Software ◽  
Turbulence Modeling ◽  
Wave Length ◽  
Experimental Results ◽  
Head Wave ◽  
Cfd Analysis ◽  
Added Resistance ◽  
Sst Model ◽  
Time Required ◽  
Good Agreement

Abstract A CFD analysis of added resistance of a KVLCC2 ship model is presented in this paper. The Naval Hydro Pack, an open source software library for computational naval hydrodynamics based on OpenFOAM is used to perform the simulations. Ten head wave cases are considered in this study ranging from short waves to long waves (wave length to length between perpendiculars ranging from 0.3 to 2). During the initial stages of our research, we had noticed significant over-prediction of added resistance compared to experimental results. After thorough analysis, the issue was found to be related to inadequate turbulence modeling using the standard k-ω SST model. Using the free surface sensitised model, the prediction of the added resistance improves significantly Compared to the experimental results, majority of the cases with different wave lengths have errors smaller than several percent. In addition to added resistance, heave and pitch motion amplitudes are compared to recent experimental results by Park et al. [1], showing good agreement. CPU time required to perform the computations is also discussed.

Equilibrium configurations and capillary interactions of Janus dumbbells and spherocylinders at fluid–fluid interfaces

Soft Matter ◽  
2019 ◽  
Vol 15 (12) ◽  
pp. 2638-2647 ◽  
Author(s):  
Carmine Anzivino ◽  
Fuqiang Chang ◽  
Giuseppe Soligno ◽  
René van Roij ◽  
Willem K. Kegel ◽  
...  
Keyword(s):  
Numerical Method ◽  
Experimental Results ◽  
Janus Particles ◽  
Fluid Interfaces ◽  
Fluid Interface ◽  
Equilibrium Configurations ◽  
Capillary Interactions ◽  
Good Agreement

We numerically investigate the adsorption of a variety of Janus particles (dumbbells, elongated dumbbells and spherocylinders) at a fluid–fluid interface by using a numerical method that takes into account the interfacial deformations. We also experimentally synthesize micrometer–sized charged Janus dumbbells and let them adsorb at a water–decane interface. We find a good agreement between numerical and experimental results.

Flow Analysis in a Chip Cavity During Semiconductor Encapsulation

1999 ◽  
Vol 122 (2) ◽  
pp. 160-167 ◽  
Author(s):  
S. Han ◽  
K. K. Wang
Keyword(s):  
Numerical Method ◽  
Flow Analysis ◽  
Cross Flow ◽  
Experimental Results ◽  
Accurate Analysis ◽  
Molding Compound ◽  
Semiconductor Chip ◽  
Encapsulation Process ◽  
Flow Through ◽  
Good Agreement

In this paper, methods to analyze the flow during semiconductor chip encapsulation have been developed. A numerical method is used for the flow analysis in the chip cavity. In this study, for accurate analysis of flow in the chip cavity, models for the cross flow through the leadframe openings have been developed. The models have been verified by comparing with two experiments. In the first experiment, clear polymer and transparent mold have been used for the visualization of flow in a cavity with a leadframe. In the next experiment, actual epoxy molding compound together with an industrial encapsulation process have been used to observe the melt-front advancement shapes. The calculated and experimental results show good agreement. [S1043-7398(00)00902-6]

Buckling Behavior of Tire Breaker Structure

1983 ◽  
Vol 11 (1) ◽  
pp. 3-19
Author(s):  
T. Akasaka ◽  
S. Yamazaki ◽  
K. Asano
Keyword(s):  
Elastic Foundation ◽  
Elastic Moduli ◽  
Wave Length ◽  
Bending Moment ◽  
Experimental Results ◽  
Automobile Tire ◽  
Buckling Behavior ◽  
Post Buckling ◽  
Steel Cord ◽  
Interlaminar Shear

Abstract The buckled wave length and the critical in-plane bending moment of laminated long composite strips of cord-reinforced rubber sheets on an elastic foundation is analyzed by Galerkin's method, with consideration of interlaminar shear deformation. An approximate formula for the wave length is given in terms of cord angle, elastic moduli of the constituent rubber and steel cord, and several structural dimensions. The calculated wave length for a 165SR13 automobile tire with steel breakers (belts) was very close to experimental results. An additional study was then conducted on the post-buckling behavior of a laminated biased composite beam on an elastic foundation. This beam is subjected to axial compression. The calculated relationship between the buckled wave rise and the compressive membrane force also agreed well with experimental results.

Inducing Frictional Force to Enhance the Transient Response in Beams

2019 ◽  
Vol 22 (2) ◽  
pp. 88-93
Author(s):  
Hamed Khanger Mina ◽  
Waleed K. Al-Ashtrai
Keyword(s):  
Numerical Analysis ◽  
Transient Response ◽  
Frictional Force ◽  
Damping Ratio ◽  
Experimental Results ◽  
Damping Capacity ◽  
Tightening Force ◽  
Contact Areas ◽  
Good Agreement ◽  
Ansys Workbench

This paper studies the effect of contact areas on the transient response of mechanical structures. Precisely, it investigates replacing the ordinary beam of a structure by two beams of half the thickness, which are joined by bolts. The response of these beams is controlled by adjusting the tightening of the connecting bolts and hence changing the magnitude of the induced frictional force between the two beams which affect the beams damping capacity. A cantilever of two beams joined together by bolts has been investigated numerically and experimentally. The numerical analysis was performed using ANSYS-Workbench version 17.2. A good agreement between the numerical and experimental results has been obtained. In general, results showed that the two beams vibrate independently when the bolts were loosed and the structure stiffness is about 20 N/m and the damping ratio is about 0.008. With increasing the bolts tightening, the stiffness and the damping ratio of the structure were also increased till they reach their maximum values when the tightening force equals to 8330 N, where the structure now has stiffness equals to 88 N/m and the damping ratio is about 0.062. Beyond this force value, increasing the bolts tightening has no effect on stiffness of the structure while the damping ratio is decreased until it returned to 0.008 when the bolts tightening becomes immense and the beams behave as one beam of double thickness.

PHOTOINDUCED NONLINEAR OCTUPOLAR POLARIZATION: TRANSIENT AND PERMANENT REGIMES

1996 ◽  
Vol 05 (04) ◽  
pp. 653-670 ◽  
Author(s):  
CÉLINE FIORINI ◽  
JEAN-MICHEL NUNZI ◽  
FABRICE CHARRA ◽  
IFOR D.W. SAMUEL ◽  
JOSEPH ZYSS
Keyword(s):  
Theoretical Analysis ◽  
Second Harmonic ◽  
Experimental Results ◽  
Polar Field ◽  
Rotational Spectrum ◽  
Dual Frequency ◽  
One Dimensional ◽  
Ethyl Violet ◽  
Disperse Red 1 ◽  
Good Agreement

An original poling method using purely optical means and based on a dual-frequency interference process is presented. We show that the coherent superposition of two beams at fundamental and second-harmonic frequencies results in a polar field with an irreducible rotational spectrum containing both a vector and an octupolar component. This enables the method to be applied even to molecules without a permanent dipole such as octupolar molecules. After a theoretical analysis of the process, we describe different experiments aiming at light-induced noncentrosymmetry performed respectively on one-dimensional Disperse Red 1 and octupolar Ethyl Violet molecules. Macroscopic octupolar patterning of the induced order is demonstrated in both transient and permanent regimes. Experimental results show good agreement with theory.

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