Analysis of Variable Porosity, Thermal Dispersion, and Local Thermal Nonequilibrium on Free Surface Flows Through Porous Media

Characteristics of momentum and energy transport for free surface flows through porous media are explored in this study. Effects of variable porosity and an impermeable boundary on the free surface front are analyzed. In addition, effects of thermal dispersion and local thermal nonequilibrium (LTNE) are also analyzed. Pertinent parameters such as porosity, Darcy number, inertia parameter, Reynolds number, particle diameter, and solid-to-fluid conductivity ratio are used to investigate the significance of the above mentioned effects. Results show that considering the effect of variable porosity is significant only in the neighborhood of the solid boundary. The range of parameters which enhance the dispersion and LTNE effects are prescribed. Finally, it is shown that adding the effect of thermal dispersion to LTNE increases the sensitivity of LTNE between the two phases.

Download Full-text

3D PARALLEL COMPUTATION FOR FREE-SURFACE FLOWS THROUGH POROUS MEDIA

Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering) ◽

10.2208/jscejhe.68.i_1219 ◽

2012 ◽

Vol 68 (4) ◽

pp. I_1219-I_1224

Author(s):

Haruka YAMASHITA ◽

Kazuya KISHIMOTO ◽

Katsuaki NAGAI ◽

Satoru USHIJIMA

Keyword(s):

Porous Media ◽

Free Surface ◽

Parallel Computation ◽

Free Surface Flows ◽

Surface Flows ◽

Flows Through Porous Media

Download Full-text

Evaluation of the Solid Boundary Treatment Methods in SPH

International Journal of Ocean and Coastal Engineering ◽

10.1142/s252980701840002x ◽

2018 ◽

Vol 01 (02) ◽

pp. 1840002 ◽

Cited By ~ 1

Author(s):

Shilong Liu ◽

Ioan Nistor ◽

Majid Mohammadian

Keyword(s):

Free Surface ◽

Free Water ◽

Treatment Method ◽

Free Surface Flows ◽

Solid Boundary ◽

Surface Flows ◽

Boundary Treatment ◽

Particle Hydrodynamics ◽

Source Models ◽

Definition Of

The smoothed particle hydrodynamics (SPH) method has been proved as a powerful algorithm for fluid mechanics, especially in the simulation of free surface flows with high speeds or drastic impacts. The solid boundary treatment method is important for the accuracy and stability of the numerical results, as the support domain of fluid particles is truncated near the vicinity of the boundary. This paper presents two commonly used methods for simulating a solid boundary in SPH simulations. Emphasis is placed on the description of the methods, definition of the boundary particles’ parameters, and discussion of their advantages and shortcomings. The classical dam break simulation is conducted using self-developed code and open source models such as DualSPHysics and PySPH in order to investigate the effects of the boundary methods. The results show that methods based on dynamic boundary particles can simulate the free water surface well with a good agreement with experimental results. The conclusions can also be used in research for boundary implementation methods for practical ocean and coastal engineering problems with free surface flows.

Download Full-text