Numerical Study on the Effect of Grouting on Long-Term Settlement of Tunnels in Clay

This is a theoretical and numerical study of a model of a rope fountain subject to a drag force that depends linearly on the rope velocity. A precise, analytical description of the long-term shape adopted by the rope is given, and various consequences are derived from it. Using parameters that naturally appear in the model, we distinguish between cases wherein energy is conserved by means of a constant tension far from the rope source (the ‘free’ case) and where energy conservation is a consequence of a non-constant tension (the ‘braked’ case). The model is used, among other things, to generate rope fountain shapes based on approximate experimental estimates of the parameter values and a careful numerical treatment.

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A numerical study on the long term thermo-poroelastic effects of cold water injection into naturally fractured geothermal reservoirs

Computers and Geotechnics ◽

10.1016/j.compgeo.2011.03.007 ◽

2011 ◽

Vol 38 (5) ◽

pp. 669-682 ◽

Cited By ~ 57

Author(s):

Joshua Koh ◽

Hamid Roshan ◽

Sheik S. Rahman

Keyword(s):

Cold Water ◽

Numerical Study ◽

Water Injection ◽

Geothermal Reservoirs ◽

Naturally Fractured

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Computational Simulations on Melting Process of Fine Metal Powders With Laser Irradiation Welding

Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C ◽

10.1115/imece2009-13219 ◽

2009 ◽

Author(s):

Kazuyuki Takase ◽

Toshiharu Muramatsu ◽

Takahisa Shobu ◽

Kazuyuki Tsukimori

Keyword(s):

Stainless Steel ◽

Metal Powder ◽

Steel Plate ◽

Numerical Study ◽

Melting Process ◽

Metal Powders ◽

Stainless Steel Plate ◽

Term Operation ◽

Breeder Reactors

At the commercial use stage in sodium-cooled fast breeder reactors, securing maintenance and repair better than an equal to that of present water-cooled reactors is needed. Especially a repair technology that secures the plant integrity for long-term operation period becomes indispensable in the heat exchanger tubes of the steam generator that form the boundary of sodium and water coolants. Then the present study focused on the standardization of welding technology with a laser. An experimental study regarding the welding of a stainless steel plate with the laser using fine metal powders is being performed. Moreover, a numerical study is performed to simulate the welding of the fine metal powder on the stainless steel plate. The fine metal powder is made of iron, and is heated by the laser beam, and then melts exceeding the melting temperature. This paper reports the computational results of the welding phenomenon of some metal powders which changes from solid to liquid and liquid to solid. The results were compared with the experimental results qualitatively.

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Wind effects on retention time in highway ponds

Water Science & Technology ◽

10.2166/wst.2008.267 ◽

2008 ◽

Vol 57 (11) ◽

pp. 1713-1720 ◽

Cited By ~ 5

Author(s):

T. R. Bentzen ◽

T. Larsen ◽

M. R. Rasmussen

Keyword(s):

Shear Stress ◽

Retention Time ◽

Numerical Study ◽

Dominant Role ◽

Road Runoff ◽

Detention Ponds ◽

Uniform Shear ◽

General Investigation

The paper presents results from an experimental and numerical study of wind-induced flows and transportation patterns in highway wet detention ponds. The study presented here is part of a general investigation on road runoff and pollution in respect to wet detention ponds. The objective is to evaluate the quality of long term simulations based on historical rain series of the pollutant discharges from roads and highways. The idea of this paper is to evaluate the effects of wind on the retention time and compare the retention time for the situation of a spatial uniform wind shear stress with the situation of a “real” spatial non-uniform shear stress distribution on the surface of the pond. The result of this paper shows that wind plays a dominant role for the retention time and flow pattern. Furthermore, the results shows that the differences in retention time between the use of uniform and non-uniform wind field distributions are not significant to this study.

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