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Pollution and Urban Heating Island (UHI) CFD Simulation

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The problem simulates changes in the mass fraction of carbon dioxide on an urban street over time.

This product includes a CFD simulation and training files using ANSYS Fluent software.

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Description

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 pollution mixture. The purpose of the analysis is to calculate the amount of CO2 pollution dissipated in an urban zone.

UHI Project Description

The problem simulates changes in the mass fraction of carbon dioxide on an urban street. To simulate this model, a 0.1 m height area should be considered as a source of carbon dioxide pollutants on the street from the urban domain. In fact, the main purpose of the current simulation is to investigate the effect of free airflow on the amount of CO2 produced by car exhaust. Therefore, an integrated carbon-dioxide production area is defined as a source of mass production on a city street.

Free airflow enters the area around an urban environment at a velocity of 0.2 m.s-1 and a temperature of 300 K. Since the CO2 and airflow are modeled, the Species Transport model has been used; Thus, these gaseous species include air and CO2. The amount of carbon dioxide produced in the definition area on the street is 4 kg.m-3.

Geometry & Mesh

The present model is three-dimensional and is drawn using the Design Modeler software. This model is a set of structural elements consisting of several building blocks and a street belonging to a city. An area in the shape of a rectangular cube with dimensions of 9 m ⨯ 13 m ⨯ 4 m is designed around this urban complex. The airflow inlet is selected in three lateral sections of this area. There is also a 0.1 m high area on one of the city streets. The following figure shows a view of the geometry.

uhi

The meshing is done using ANSYS Meshing software. The mesh type is unstructured and the element number is 4137570. Grids are smaller in the areas adjacent to the internal boundaries and have higher accuracy. The following figure shows a view of the mesh.

Pollution CFD Simulation

To simulate the present model, several assumptions are considered:

  • The solver is pressure-based.
  • The simulation is transient since the goal is to study changes in carbon dioxide concentration over time.

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

Models (UHI)
Viscous modelk-epsilon
k-epsilon modelstandard
near-wall treatmentstandard wall function
species transport model
speciesair, CO2
Energyon
Boundary conditions (UHI)
InletVelocity inlet
velocity magnitude0.2 m.s-1
temperature300 K
CO2 mass fraction0
OutletPressure outlet
gauge pressure0 Pascal
WallsWall
wall motionstationary wall
heat flux0 W.m-2
CO2 mass fractionzero diffusive flux
Solution Methods (UHI)
Pressure-velocity coupling SIMPLE
Spatial discretizationpressuresecond-order
momentumsecond-order upwind
turbulent kinetic energyfirst-order upwind
turbulent dissipation ratefirst-order upwind
energysecond-order upwind
CO2second-order upwind
(UHI)Initialization
Initialization method Standard

Results

At the end of the solution process, two-dimensional contours of pressure, temperature, velocity, air and CO2 mass fraction were obtained in the whole model environment. These two-dimensional contours are drawn in XY and YZ sections. Also, the three-dimensional contours related to pressure, temperature, velocity, air and CO2 mass fraction have been obtained in the area of the CO2 source term.

 

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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