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Simulation of airflow in a windcatcher in Dowlat Abad mansion

Simulation of airflow in a windcatcher in Dowlat Abad mansion

Wind turbines are used today in central parts of Iran and parts of the Middle East. You can use a lot of wind turbines. One of them is cooling the building in the summer. These wind-ups use an air inlet at a location above the building, which stretches the wind and leads to the building, and as a result, the air flows downward.

Another type of winding drives the flow of air upwards using the temperature differential and the natural displacement phenomenon. These applications can be used in zero-energy buildings for ventilation. By combining these methods and modern methods, they can also design systems that do not harm the environment or damage the cemetery. Fluid simulation of wind turbines is an economical way to check their performance in different weather conditions before making them.

In this analysis, an attempt has been made to simulate and analyze the ventilation and cooling system of Dowlat Abad Mansion using Ansys Fluent software.

Geometry and Mesh

The geometry required for this analysis, which is the body of the building and the winding section of the building, is designed in Gambit software. The grid required for this analysis has been generated by Ansys Meshing software. The grid type used in this analysis is unorganized and the total number of cells produced for this geometry is 304266 cells.

Model

Since the structure is exposed to the external wind current and the wind speed is somewhat high, the K-epsilone RNG model is used to analyze the current turbulence, and the standard wall function is used for the wall proximity.

Boundary Condition

The flow input in this analysis is defined as the Velocity Inlet for airflow at the winding input of 12 m / s. The output pressure is also governed by the Pressure Outlet boundary condition.

Discretization of equations

Due to the type of heat transfer in this analysis, the Pressure-Based solver is used as a permanent solution for solving the equations and the Simple algorithm is used to decompose the coupling of speed and pressure. The momentum equations are discarded in the Second Order Upwind.

Finally, the results are shown as the contours of the flow lines, the pressure on the surfaces, the velocity vectors on the surfaces, and the fluid velocity.

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