Water infiltration into a porous concrete block
The present problem simulates the infiltration of water flows into a cubic concrete porous block over time, using ANSYS Fluent software.
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Water Infiltration in a Porous Concrete Block Project Description
The present problem simulates the infiltration of water flows into a cubic porous medium using ANSYS Fluent software. In this modeling, a cube block is designed as a porous medium. The water flow enters it from a circular section at the bottom of the block. After passing through the porous material, it leaves the upper section of the block. The inlet water flow has a relative pressure of 5 bar or 500,000 pascal; Therefore, a pressure inlet boundary condition is used at the block input. The porous medium defined in the block has a porosity coefficient equal to 0.01; This means that the ratio of empty space to the block’s total volume is equal to 0.01. .
It is also assumed that there is only air inside the block in the initial state, and then water flow penetrates it. Therefore, to define a two-phase flow consisting of water and air, the VOF or volume of fluid model is used. The purpose of the present work is to investigate the extent of water infiltration into this porous block over time. Therefore, the current problem is solved unsteady and time-dependent.
Porous Block Geometry & Mesh
The present model is designed in three dimensions using Design Modeler software. This model consists of a cubic block with a side of 0.15 m; So that a special circular inlet for flow entry in the bottom of this block is located with a diameter of 0.07 m.
We carry out the meshing of the model using ANSYS Meshing software, and the mesh type is unstructured. The element number is 623464. The following figure shows the mesh.
We consider several assumptions to simulate the present model:
- We perform a pressure-based solver.
- The simulation is unsteady. Because the purpose of the present work is to investigate the extent of water infiltration into this porous block over time.
- The gravity effect on the fluid is ignored.
The following table represents a summary of the defining steps of the problem and its solution:
|near wall treatment||standard wall function|
|number of eulerian phases||2 (air & water)|
|gauge total pressure||500000 pascal|
|air volume fraction||0|
|water volume fraction||1|
|gauge pressure||0 pascal|
|wall motion||stationary wall|
|momentum||second order upwind|
|turbulent kinetic energy||first order upwind|
|turbulent dissipation rate||first order upwind|
|gauge pressure||0 pascal|
|velocity (x,y,z)||0 m.s-1|
|water volume fraction||0|
|air volume fraction||1|
Results & Discussions
At the end of the solution process, two-dimensional and three-dimensional contours related to each water and air phase’s pressure and volume fraction are obtained. These contours were obtained at different times in a time interval of 0.2 s. It can be seen from the pictures that over time, the infiltration rate of water flow inside the block increases. It is also observed that the water flow decreases with pressure by moving inside the porous block, which is due to the effects of a porous medium.
There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.