Pollution and Urban Heating Island (UHI) CFD Simulation
Today, the environmental pollutants are considered to be one of the most important human problems, and air pollution is of particular importance.
This product includes a CFD simulation and training files using ANSYS Fluent software.
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UHI and Pollution CFD Simulation
Urban environments are the most important context of life, and in most developing countries the status of air pollution is getting worse day by day, although technological improvements have played an important role in reducing air pollution emissions. Due to the increasing demand for transportation, it will remain a challenge. Simulation using the Species Transport solves a Transport Equation for each component of the mixture. The purpose of the analysis is to calculate the amount of CO2 pollution.
Geometry & Mesh
We design the 3-D urban zone by Design Modeler software. After modeling the geometry, it is time to move on to the next step, Meshing. Since the ANSYS Fluent software uses the finite volume method, it is important to have a high quality grid.
The mesh should have two main features:
1. In areas where there are high variations (steep gradients), grid should be small enough.
2. The boundary layer meshing should be properly done.
Due to the geometrical complexity, it was not possible to have an structured mesh, so the unstructured mesh was done. The total element number is 3,416,951. Since the mesh was not sufficiently fine-grained, Wall-Function was used to estimate the boundary layer.
Pollution Analysis by ANSYS Fluent software
Once the mesh is loaded onto the ANSYS Fluent software, the solution process begins. The following steps must be done:
1. Definition of the problem
2. Select the turbulence model
3. Define cell zone and boundary conditions
4. Activate the Species Transport model
5. Definition of materials
6. Determine how to solve the equations and specify the quantities to solve
|Time setting:||Steady State|
|Near-Wall treatment:||Standard Wall function|
|Boundary conditions:||Inlet : velocity inlet : 0.2 m/s | 0 CO2 mass fraction
Outlet : pressure outlet : 0 pa | 0 CO2 mass fraction
Wall-road : No-slip | 0.02 CO2 mass fraction
symmetry : Symmetry
City Streets : Wall : No-slip | 0.02 CO2 mass fraction
Building : Wall : No-slip | Zero Diffuse flux CO2
|Pressure interpolation scheme:||Standard treatment|
|Momentum:||Second Order Upwind|
|Turbulent kinetic:||First Order Upwind|
|Turbulent dissipation:||First Order Upwind|
|Species Transport :|
|Species Transport :||Enabled|
|Options:||Diffusion Energy Source|
|Number of volumetric species:||2|
|Material used :|
|Mixture:||CO2 : Cp piece-wise polynomial
Air : Fluent Default
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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