Server Room Cooling with 6 Cabinets

Server Room Cooling CFD Simulation with 6 Cabinets

Description

Server rooms generate large amounts of heat, and keeping that heat within a safe band is critical: manufacturers typically specify an operating range of about 10–32 °C, and drifting outside that range creates unstable conditions that threaten the equipment. Cooling is therefore one of the core challenges in data-center design, alongside airflow planning, power redundancy, and fire suppression.

This project uses ANSYS Fluent to model the airflow and temperature distribution inside a six-cabinet server room and determine whether the cooling system keeps every rack within the safe thermal range. The case demonstrates how CFD serves as a practical design-verification tool: instead of guessing whether a cooling configuration is adequate, the simulation shows exactly where hot regions form and how changing the supply airflow resolves them.

Methodology

The room is modeled in three dimensions in Design Modeler, measuring 7 × 4 × 2 m, with six server cabinets — each 1 × 0.6 × 1.8 m — arranged inside as heat sources. The domain is meshed in ANSYS Meshing with a structured grid of 448,000 elements.

The simulation treats the room as a forced-convection problem. Cool air enters at 15 °C, and each of the six cabinet racks is modeled as a 400 W heat source. Since forced convection dominates over natural convection in this configuration, the air density is taken as constant. The key design variable is the inlet air velocity, which is studied at two values — 0.5 m/s and 1 m/s — to evaluate how the supply airflow rate affects rack cooling. The objective is to find the conditions that hold the entire room below the safe 32 °C limit.

Analysis

At the end of the solution process, 2-D and 3-D contours of temperature and streamlines are generated, along with plots of the maximum and average air temperature. The results tell a clear engineering story: at the lower inlet velocity of 0.5 m/s, the thermal requirement is not satisfied — parts of the room exceed the safe 32 °C limit. Raising the inlet velocity to 1 m/s brings the maximum temperature down to around 30 °C, back inside the safe band.

In other words, increasing the supply airflow directly improves rack cooling and resolves the overheating — a quantitative demonstration of the relationship between air supply and thermal safety that underpins real data-center design. By completing this project, you will be able to set up a 3-D forced-convection cooling simulation with multiple heat sources, run a comparative study across inlet conditions, and use temperature contours and bulk-temperature plots to verify that a cooling design meets a required thermal limit.