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Wind-Driven Rain, Ansys Fluent Simulation Training

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In this project, wind-driven rain 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

Project Description

In this project, numerical simulation of wind-driven rain has been done using Ansys Fluent software. The purpose of this project is to investigate the movement of raindrops in wind conditions of 5 meters per second, which has been done in two ways, one-way DPM and two-way DPM. The diameter of the drops is 0.5 cm but in order to be seen better, they have been scaled in contours and animation.

Geometry&Mesh

The two-dimensional geometry of this project has been produced with Spaceclaim software. The length of the computational area is 20 m and its height is 10 m.

Wind-Driven Rain

The meshing of this present model has been generated by Ansys Meshing software. The mesh grid is unstructured and the total cell number is 19741.

Wind-Driven Rain

Wind-Driven Rain CFD Simulation

To simulate the present model, we consider several assumptions:

  • The solver is pressure-based.
  • The present simulation is unsteady in terms of time.
  • The gravity effect is equivalent to -9.81 m.s-1.

Here is a summary of the steps for defining the problem and its solution in the following table:

Models
Viscous model Spalart Allmaras
Discrete phase on
particle treatment unsteady particle tracking
material in injection anthracite
particle type in injection inert
injection type group
Boundary conditions
Inlet Velocity inlet
velocity magnitude 5  m.s-1
discrete phase BC type reflect
Outlet Pressure outlet
gauge pressure 0 Pascal
discrete phase BC type escape
bottom Wall
wall motion stationary wall
discrete phase BC type trap
Solution Methods
Pressure-velocity coupling   simple
Spatial discretization pressure second-order
momentum second-order upwind
Modified turbulent viscosity first-order upwind
Initialization
Initialization method   hybrid

Wind-Driven Rain Results

According to the animation and speed and pressure counters, it is clear that solving this problem in the form of a one-way coupling was sufficient and there was no need to solve a two-way coupling. We know that in two-way couplings, the momentum effects of particles on the fluid are also calculated. Therefore, it has a much larger computational volume than one-way couplings, and in simulations where the number and size of particles are very large, these effects must be considered.

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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