Determination of inhomogeneous medium structure by the dynamic visualization method

This chapter proposes a new educational methodology for theoretical contents. It aims to effectively transmit theoretical content meanings. Here, the effects of content visualization enhance the transmission of meaning. By processing visual information, the human brain can immediately understand the mutual relationships between elements in addition to the whole meaning. Comprehension becomes increasingly effective when movement is added to static information. The new educational methodology proposed here is based on such visualization. It is called “The Dynamic Visualization Method.” It is designed so students can visually set allowable conditions before processing them. This selective freedom enables students to extract their hidden leaning interests. Mathematical processes were used to verify the effectiveness of this methodology. A variety of items were thus adopted ranging from the elementary-school to university levels. The contents of those items are visualized in this chapter. The educational effects are then discussed.

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Bubble Behaviour in Viscous Flows: Experimental and Numerical Determination of 3D-Trajectories

Volume 1: Symposia, Parts A and B ◽

10.1115/fedsm2006-98139 ◽

2006 ◽

Author(s):

Sylvain Chaminade ◽

Jean Toutain ◽

Stefan Dilhaire ◽

Eric Arquis ◽

Christine Marraud ◽

...

Keyword(s):

Viscous Flows ◽

Coupling Model ◽

Light Sources ◽

Visualization Method ◽

Air Bubble ◽

Video Cameras ◽

Silicon Oil ◽

Selection Of ◽

Bubble Behaviour

We studied the air bubble behavhiour in viscous flows. A one-way coupling model was developed, based on lagrangian method. In order to validate this model, experiments were carried out. Our experimental installation was based on shadow visualization method. Bubbles were introduced in a transparent Plexiglas tank filling with viscous fluid (e.g. silicon oil) and were illuminated by diffused lights. In order to reconstruct 3D-trajectories, two video cameras, orthogonally placed, took pictures of shape bubbles and a post treatment of images acquired allowed us to determine the position of the center and the radius of each bubble. Thus, from this information of each plane, we could determine the 3D parameters of bubbles. Superluminescent LEDs with different wave-lengths were used as light sources. The choice of the wavelengths for each plane illumination and the selection of appropriated RGB filter of CCD sensor allowed us to prevent dissymmetry of bubble shape which was due to parasitic orthogonal illumination. Numerical results agree with experimental data.

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A 3D dynamic visualization method coupled with an urban drainage model

Journal of Hydrology ◽

10.1016/j.jhydrol.2019.123988 ◽

2019 ◽

Vol 577 ◽

pp. 123988

Author(s):

Guozheng Zhi ◽

Zhenliang Liao ◽

Wenchong Tian ◽

Xin Wang ◽

Juxiang Chen

Keyword(s):

Urban Drainage ◽

Dynamic Visualization ◽

Visualization Method

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Determination of parameters of symmetric coupled lines in an inhomogeneous medium using reflected and transmitted waveforms

IEEE Transactions on Electromagnetic Compatibility ◽

10.1109/15.736226 ◽

1998 ◽

Vol 40 (4) ◽

pp. 382-385 ◽

Cited By ~ 3

Author(s):

I. Sakagami ◽

S. Chino

Keyword(s):

Inhomogeneous Medium ◽

Coupled Lines ◽

Determination Of Parameters

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Simultaneous determination of sounding signal and wave propagation velocity in a vertically-inhomogeneous medium

Computerized Tomography ◽

10.1515/9783112314067-010 ◽

1995 ◽

pp. 70-77

Keyword(s):

Wave Propagation ◽

Simultaneous Determination ◽

Inhomogeneous Medium ◽

Propagation Velocity ◽

Wave Propagation Velocity

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Experimental determination of the main features of the viscous flow in the wake of a circular cylinder in uniform translation. Part 1. Steady flow

Journal of Fluid Mechanics ◽

10.1017/s0022112077000135 ◽

1977 ◽

Vol 79 (2) ◽

pp. 231-256 ◽

Cited By ~ 366

Author(s):

Madeleine Coutanceau ◽

Roger Bouard

Keyword(s):

Reynolds Number ◽

Circular Cylinder ◽

Velocity Distribution ◽

Viscous Flow ◽

Experimental Determination ◽

Geometrical Parameters ◽

Visualization Method ◽

Number Range ◽

Hydrodynamic Field

A visualization method is used to obtain the main features of the hydrodynamic field for flow past a circular cylinder moving at a uniform speed in a direction perpendicular to its generating lines in a tank filled with a viscous liquid. Photographs are presented to show the particular fineness of the experimental technique. More especially, the closed wake and the velocity distribution behind the obstacle are investigated; the changes in the geometrical parameters describing the eddies with Reynolds number (5 < Re < 40) and with the ratio λ between the diameters of the cylinder and tank are given. A comparison with existing numerical and experimental results is presented and some remarks are made about the calculation techniques proposed up to the present. The limits of the Reynolds-number range for which the twin vortices exist and adhere stably to the cylinder are determined.

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