Server Room Cooling with 6 Cabinet, ANSYS Fluent CFD Simulation Training
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A server room cooling including 6 cabinets is simulated by ANSYS Fluent software.
This product includes a Mesh file and a comprehensive Training Movie.
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A server room is a place that provides the right environment for the safe operation of processing systems such as supercomputers and currency encryption centers. The size of server rooms varies from 5 to 81 square meters, and if the size is more prominent, they are known as data centers. Essential parameters in a server room design include Precise Environmental Control, Airflow Planning, Fire Suppression System, Cable Management Solutions, Redundant Power Sources, and Physical Security. Meanwhile, the cooling of these rooms was considered with the help of computational fluid dynamics. In this study, the effect of server heat generation and air velocity in the computational domain was studied.
To increase efficiency and reduce the risks of temperature rise in server rooms, the safe range offered by manufacturers is in the range of 10 to 32 degrees. Thus, decreasing the temperature below 10 degrees and increasing the temperature above 32 degrees creates unstable conditions in these rooms. Therefore, the airflow inside the server room was modeled using Ansys Fluent. The air inlet temperature was 15 degrees, and the airspeed was 0.5 and 1 meters per second. Also, the amount of heat generation in each cabinet rack was assumed to be 400 watts. Also, six cabinets were designed as heat sources inside the server room. In addition, in the figure below, the geometry of the problem was considered along with the boundary conditions. This study aims to achieve stable thermal compose in the safe range regarding temperature for server rooms.
Geometry & Mesh
The geometry of the server room was designed in the Design Modeler module, and the dimensions of the room and cabinet are 7 * 4 * 2 meters and 1 * 0.6 * 1.8 meters, respectively. The figure below shows the geometry of the room.
ANSYS Meshing software was used for grid generation. The mesh type for fluid and the solid domain was structured, and an aspect ratio close to 1 was considered. The size of the elements is 50 mm, and the total number of grids is 448,000. The boundary layer mesh was not used to satisfy the Y plus number by the selected wall function. The figure below shows a 3D grid view with wireframe mode.
Fluent software was used to solve the governing equations numerically. The problem is analyzed steady, using the pressure-based method and considering the gravitational effects.
In this study, air-fluid was used as the working fluid, and due to the predominance of forced convection on the natural convection effect, the air density was assumed to be constant. Also, The table below shows the characteristics and values of boundary conditions, along with the models and hypotheses.
|Amount (units)||Fluid properties (air)|
|1006.43 (j/kg.K)||Specific heat|
|0.0242 (w/m.k)||Thermal conductivity|
|velocity inlet||0.5 & 1 m/s|
|pressure outlet (gauge pressure)||0 pa|
|Wall||Adiabatic (heat flux=0 W/m2)|
|Cell zone condition|
|Six racks (aluminum)& 400 W/m3 heat generation for each rack||air|
|Turbulence models (server room)|
|Solution methods (server room)|
|Simple||pressure velocity coupling|
|First-order upwind||turbulent kinetic energy|
|First-order upwind||turbulent dissipation rate|
|0 (Pa)||gauge pressure|
|0 (m/s)||y-velocity , z-velocity|
In this part, by observing the temperature contour in different sections and the diagram of the maximum and average temperature of the fluid, it was shown that the maximum temperature condition of fewer than 32 degrees was not satisfied. Thus, by increasing the input speed, we eliminate this shortcoming. The graph of the maximum and average temperature of the fluid bulk for the inlet speed of 1 m / s during the solution was shown in the figure below.
As it is clear, the maximum temperature has reached the safe range of the server room as the speed increases. In the diagram below, it was clear that the maximum temperature has reached the range of 30 degrees, and increasing the speed has had a positive effect on better cooling of the racks. The following counters are the temperature for the two modes with speeds of 0.5 and 1 meter per second, respectively.
There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.