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Waterfall CFD Simulation Using Two-Phase Flow

$55.00 $13.00

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In this project, the separation of laminar fluid flow in a natural waterfall is investigated and analyzed.

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

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To order your ANSYS Fluent project (CFD simulation and training), contact our experts via info@mr-cfd.com, online support, or WhatsApp.

Description

Introduction

Flow separation from a surface or separation of two-phase flows (natural waterfall) is one of the most important issues in fluid mechanics. Flow separation due to the specific shape of the geometry or flow can have positive or negative effects on its surroundings. Therefore, it has always been tried to control this phenomenon as much as possible and to investigate the possible effects and consequences.

Project Description

In this project, the separation of laminar fluid flow from a surface which is easily seen in a natural waterfall is investigated and analyzed. This separation occurs only due to gravity and the difference in height between the two surfaces. Water enters the fluid domain with a mass flow of 20 Kg/s and falls when the lower bed is finished, converting into a waterfall. K-epsilon and implicit VOF models are activated to analyze this flow.

waterfall Geometry & Mesh

The geometry and the mesh for this project are created inside Gambit®. The geometry includes a mass-flow inlet, 3 pressure outlets, several symmetry and wall boundary conditions and 9 different partitions.  The mesh type used for this geometry is structured and the element number is 626400.

waterfall waterfall

Waterfall CFD Simulation Settings

The key assumptions considered in this project are:

  • Simulation is done using pressure-based solver.
  • The present simulation and its results are considered to be steady and do not change as a function time.
  • The effect of gravity has been taken into account and is equal to -9.81 in Y direction.

The applied settings are summarized in the following table.

 
Models
Viscous modelk-epsilon
k-epsilon modelRNG
near wall treatmentstandard wall function
Multi phaseVOF
FormulationImplicit
Phase 1Air
Phase 2Water
Boundary conditions
InletMass-flow inlet
Water mass-flow rate20 Kg/s
Turbulent kinetic energy1 m2/s2
Turbulent dissipation rate1 m2/s3
OutletsPressure outlet
Gauge pressure0 Pa
Turbulent kinetic energy1 m2/s2
Turbulent dissipation rate1 m2/s3
Walls
wall motionstationary wall
Solution Methods
Pressure-velocity couplingSimple
Spatial discretizationpressurePRESTO!
Volume fractionModified HRIC
momentumsecond order upwind
Turbulent kinetic energyfirst order upwind
Turbulent dissipation ratefirst order upwind
Initialization
Initialization method Standard
gauge pressure0 Pa
velocity (x,y,z)(0,0,0) m/s
water volume fraction0
Turbulent kinetic energy1 m2/s2
Turbulent dissipation rate1 m2/s3

Results

Contours of pressure, velocity, volume fraction, etc. are presented.

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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