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Water infiltration into a porous concrete block

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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.

water infiltration

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.

water infiltration

CFD Simulation

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:

Viscous k-epsilon
k-epsilon model standard
near wall treatment standard wall function
Multiphase Model VOF
number of eulerian phases 2 (air & water)
formulation explicit
Interface modeling sharp
Boundary conditions
Inlet Pressure Inlet
gauge total pressure 500000 pascal
air volume fraction 0
water volume fraction 1
Outlet Pressure Outlet
gauge pressure 0 pascal
wall motion stationary wall
Pressure-Velocity Coupling SIMPLE
pressure PRESTO
momentum second order upwind
volume fraction Geo-Reconstruct
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
Initialization methods Standard
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.


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