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Pond Overflow CFD Simulation by ANSYS Fluent

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The present problem simulates the water flow on a overflow enters the pond using ANSYS Fluent software.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Description

Project Description

The present problem simulates the water flow on a overflow enters the pond using ANSYS Fluent software. In the current simulation, there is an ogee overflow that leads to a pond. In this simulation, two types of models are defined, in one of which, water flows as a free surface flow to the overflow and then flows into the pond; While in another, the water flows under pressure on the overflow and flows into the pond. Therefore, for both cases, a two-phase VOF flow model is used; So that the primary phase (air) and the secondary phase (water) are defined.

In the case where the flow is free surface, the water flow reaches the overflow at a certain height, with a flow rate of 140 kg.s-1. In the case of pressure form, the water flows at a certain height with a flow rate of 420 kg.s-1.

Geometry & Mesh

The present model is designed in two dimensions using Design Modeler software. The geometry of the model consists of an ogee overflow that leads to a pond. Of course, modeling is designed in two modes, in one of which, there is an upstream area before the overflow, but in the other, this area does not exist. The inlet flow boundary consists of two separate parts, which include the water flow inlet and the air flow inlet.

pond pond

The meshing of the model has been done using ANSYS Meshing software and the mesh type is semi structured. The element number of free flow case is 20142 and of the pressure flow case is 16409. The following figure shows the mesh.

pond pond

CFD Simulation

To simulate the present model, several assumptions are considered:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is equal to -9.81 m.s-2 along the Y-axis.

A summary of the defining steps of the problem and its solution is given in the following table:

Models
Viscous k-epsilon
k-epsilon model standard
near-wall treatment standard wall function
Multi phase Model VOF
formulation implicit
interface modeling type sharp
number of Eulerian phase 2 (air & water)
Boundary conditions
Air-Inlet Pressure Inlet
gauge pressure 0 pascal
air volume fraction 1
Water-Inlet Mass Flow Inlet
gauge pressure 0 Pascal
water mass flow rate 140 kg.s-1 / 420 kg.s-1
Ogee Wall Wall
wall motion stationary wall
Outlet Pressure Outlet
gauge pressure 0 Pascal
Pond Wall Wall
wall motion stationary wall
Methods
Pressure-velocity coupling SIMPLE
pressure PRESTO
momentum second order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
volume fraction compressive
Initialization
Initialization methods Standard
gauge pressure 0 Pascal
x-velocity 0.4636283 m.s-1
y-velocity 0 m.s-1
water volume fraction 0

Results

At the end of the solution process, two-dimensional contours related to pressure and velocity, and the volume fraction of each of both phases are obtained. Also, the results are obtained in both cases. The diagram of static pressure changes of water flow in term of direction of the pond in both models is obtained.

pond pond

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

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