CFD Simulation of Wind-Driven Rain on the Labtek II FMAE ITB Building with Eulerian Multiphase Model

• Main Author: Irfan Fadhlurrahman, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/36662
• Institution: Institut Teknologi Bandung

Rain not only causes a load on building surfaces but also in large amount will stay on the surface even after the rain stops. Those problem will frequently occur if driving rain or wind-driven rain (WDR) frequently occurs too. WDR is rain with a horizontal velocity component due to its co-occurance with wind flow. A research to estimate WDR intensity is needed to reduce the problem which is caused by WDR on a building facades. Computational Fluid Dynamics (CFD) was used in this thesis to estimate WDR intensity. Multiphase flow model that was used for CFD Simulation, is Eulerian Multiphase (EM) model. Simulation object in this thesis is east facade of Labtek II FTMD ITB building near GKU Barat. Meteorological conditions like wind speed, wind direction, and rain intensity, was used in maximum, minimum, and mostly value. Inlet boundary conditions used velocity profile, turbulent kinetic energy profile, and turbulent dissipation rate profile. Outlet is pressure-outlet, building surface and ground are no-slip wall. Symmetry boundary was on lateral side of computational domain. CFD simulation results estimate WDR intensity which is expressed by specific catch ratio and catch ratio. Their maximum values respectively are 4,048 for U10 = 5,14 m/s and 0.014 for U10 = 0,514 m/s . Validation of the CFD simulation results, use a semi-empirical method: ASHRAE model and Straube & Burnett. Difference between CFD results and semi-empirical methods ASHRAE and Straube & Burnett model are 2,46% - 371,83%, and 2,17% - 86,15%. Large difference percentage occurs because semi-empirical methods has many weaknesses and needs a further development.