Articles techniques et présentations

Mass transport modelling through porous media is typically characterized by complex physics and geometry. In the particular case of radionuclide transport, modelling for radioactive waste repositories, an additional level of complexity, and thus uncertainty, originates from the long time ... En savoir plus

Pyrometallurgical furnaces are used to produce metals such as copper, nickel and platinum by the smelting process. During smelting, the undesired material components are separated from the desired metal resulting in the formation of a slag and matte/metal phase. The slag phase ... En savoir plus

Radionuclide sorption is often simulated using a lumped approach where retention processes are represented by the distribution coefficient (Kd), which relates the radionuclide mass retained in the solid phase to its aqueous concentration. Classical Kd-based simulations rely on two strong ... En savoir plus

2015年由美国大发起页岩气革命成功地使美国从油气进口国转变为油气出口国。这使得页岩气成为能源领域关注的热点。页岩气与煤炭和石油相比更为清洁，且储量更为丰富。开发页岩气的两项关键技术是水平井钻井技术和压裂改造地层技术。 然而，由于页岩相比于其他岩石水化学活性更强，导致在水平井钻穿储层过程中井壁极容易垮塌失稳。油基泥浆的使用可以克服上述问题，但成本昂贵且受环保限制。水基泥浆的普及依赖于对页岩水化的深入理解。在页岩水化反应过程中，温度场、离子浓度场、渗流场、应力场均不同程度地作用在井壁周围岩石，而且相互耦合作用随时间不断变化 ... En savoir plus

The influence of the energy (heat) stored in the earth as a major factor in environmental soil processes is recognized by the soil science community. The heat (energy) supplied by the earth is known to fluctuate with depth below ground surface and time of year, obviously as a function ... En savoir plus

冻融循环引起的破坏是季节冻土区渠道的主要病害，其发生与温度梯度和水分迁移有密切的联系。为了研究冻融循环作用下土体温度变化与水分分布，多场耦合理论应运而生。但目前存在的多场耦合模型大多采用了过多的参数，其中的一些参数甚至难以确定。因此本文基于Harlan流体动力学模型，以温度和孔隙率为变量建立了一个实用的多场耦合控制方程，然后采用COMSOL Multiphysics中的数学模块中的系数型偏微分方程（PDE）对土体温度场和水分场进行模拟，并与室内水分迁移试验进行对比，证明了该耦合模型的有效性。最后以北部引嫩工程渠道为例，建立模型试验，所得试验结果与模拟结果也是十分接近。 En savoir plus

In boreholes nozzles have to be found advantageous to increase the infiltration rate of water into the subsurface ground. Studies and practice in the field shows that the infiltration of water into permeable aquifers can be improved, if the flow in the borehole is modified. Due to the ... En savoir plus

This study presents the simulation of transport phenomena in the Horstberg geothermal system in the North German Basin. The Horstberg geothermal system composed of a subsurface reservoir and a borehole. The borehole was completed in a multilayer sandstone reservoir and an induced ... En savoir plus

Many numerical coupling thermo-hydro-mechanical-chemical models for methane hydrate bearing sediments(MHBS) have been proposed to analyze the mechanical behavior of MHBS during methane gas production. However, most of them are based on finite differential method (FDM) or finite volume ... En savoir plus

Disposal in deep clay geological formations is one of the promising options for disposal of high-level radioactive waste. Yet, they can generate considerable amounts of heat as a side effect of radioactive decay. This paper shows how COMSOL Multiphysics has been used to evaluate the ... En savoir plus