Дослідження впливу розливу забруднюючої речовини на вологоперенесення в ґрунті засобами комп’ютерного та математичного моделювання

• Дата: 2018
• Автори: Кожушко, Олена Дмитрівна, Мартинюк, Петро Миколайович
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Kamianets-Podilskyi National Ivan Ohiienko University 2018
• Онлайн доступ: http://mcm-tech.kpnu.edu.ua/article/view/140028
• Назва журналу: Mathematical and computer modelling. Series: Technical sciences

Computer and mathematical modelling of moisture transport processes holds a prominent place in designing hydraulic structures, evaluating strength of potential slide soils, modelling crop growth etc. Such problems are among those constituting economic security of the country.For the purpose of formulating moisture transport problem the model including interconnected processes of moisture, heat and mass transfer has been used in this paper. Different variable environmental and process parameters have been considered, as well as some relations for their calculating. Investigation of the given model has been conducted for the instance of the two-dimensional problem in the case of contaminant spillage on the soil surface. The characteristic feature of this problem is contamination of the soil in consequence of contaminant adsorption by the solid soil particles. In this case, we believe that accounting for porosity changes, which occur due to expansion of soil particles, is highly important. Moreover, other factors are making difference, such as variable pore solute density, which is increasing on dissolving contaminant salts, and the chemical osmosis, which influences soil water flow.The set moisture transport problem including variable porosity has been solved numerically using the finite element method. Program implementation of the corresponding algorithms has been conducted in FreeFem++ environment. A series of numerical experiments has been done, and solutions of the classical moisture transport problem and the one considering mass and heat transport have been compared. In the second case moisture distribution in the soil is much more irregular. It reflects more accurately the setting of the problem and is explained by the impact of mentioned above variable parameters. The results of the numerical experiments attest the importance of considering mass transfer and accompanying factors for that kind of problems.