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Water Spraying from the Roof of the Greenhouse, Ansys Fluent Simulation Training

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In this project, water spraying from the roof of the greenhouse has been simulated and the results of this simulation have been investigated.

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Description

Water Spraying Project Description

In this project, numerical simulation of water spraying from the roof of the greenhouse has been done using Ansys Fluent software. The system consists of two different fluids, including air as the primary fluid and one secondary fluid is water. The Eulerian VOF model has been used. The jet-air is entering the domain with the speed of 0.3 m/s with gravity considered as -9.81 m/s-2 on the y-axis.

Geometry & Mesh

The 2-D geometry of the present model is carried out using Design Modeler software. The geometry consists two-section, the lower section is resident water, and the upper section contains outlet and velocity inlet; tank sides are considering as wall.

Water Spraying

The meshing of this present model has been generated by Ansys Meshing software. The mesh grid is unstructured with no element quality lower than 0.68, and the total cell number is 208921. the figure below shows an overview of the performed mesh.

Water Spraying

Water Spraying CFD Simulation

To simulate the present model, several assumptions are considered, which are:

  • The solver is pressure-based.
  • Simulation has only examined fluid behavior; in other words, heat transfer simulation has not been performed.
  • The effect of gravity on the flow is considered to be 9.81 m.s-2 and along with the y-axis in the present model.

The following is a summary of the steps for defining the problem and its solution.

Models
K-omega Viscous model
SST k-omega model
shear flow corrections k-omega options
air primary phase
water secondary phase
explicit formulation
Boundary conditions
Velocity-inlet inlet
0 initial gauge pressure mixture
0.3 m/s velocity magnitude water
1 volume fraction
Pressure outlet outlet
1 backflow volume fraction air
0 backflow volume fraction water
wall wall
stationary wall wall motion
Solution Methods
Phase coupled pressure-velocity coupling
PRESTO! pressure
first-order upwind momentum
first-order upwind specific dissipation rate
first-order upwind volume fraction
Initialization
standard initialization method
0.3 m/s water velocity (0,y,0)
0 m/s air velocity (x,y,z)
1 the secondary phase volume fraction

Results

At the end of the solution process, two-dimensional and three-dimensional velocity, air, and water volume fraction are obtained. This 2-D simulation show water starts to pump in conservatory roof watering system nozzles, and drops down and covers the soil surface fully to activate correctly.

You can obtain Geometry & Mesh file and a comprehensive Training Movie which presents how to solve the problem and extract all desired results.

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