[Shadab_mdr]

Hello everyone,

I'm currently working on a CFD analysis to compute wind pressure coefficients (Cp) on a building facade. My objective is to use these Cp values in the BES-AFN tool for evaluating the impact of natural ventilation. While reviewing various studies that have undertaken similar work, I've encountered conflicting information regarding the parameter Uref.

In Eddy3D, a plugin for OpenFoam with the capability to create a cylindrical domain, default values for Uref and Zref are set at 10 m/s and 10m, respectively. Eddy3D doesn't request additional input for the local wind speed. However, some research papers suggest that the dynamic wind pressure (Pd) necessary for Cp calculations should be determined at the building height.

My analysis involves a parametric design, exploring different building heights. So I suppose I need to establish a consistent reference height for all simulations. I've already obtained weather data containing wind speeds and directions and have calculated average wind speeds at a height of 10m for 12 different directions. My question is whether these averaged values should be directly input as boundary conditions or if I should stick with a fixed value for Uref, like the mentioned 10 m/s.

Any guidance to clarify this matter would be greatly appreciated.