Item description

Simulation of heat transfer on a brake disk in Ansys Fluent

The subject of friction and heat transfer effect on brake performance and brake disc’s life. One of the most important components of every vehicle is its braking system. It is necessary that the brake system works without fail, and designers are always looking to improve its performance. The friction brake system is one of the common types of brake systems in which the kinetic energy of the vehicle is converted into thermal energy by the friction between the disk and the brake system components. If the temperature’s rise is high, the friction will be reduced and the brakes do not work well. Therefore, an increase in the heat transfer speed from the braking system to the surrounding environment is desired by the designers. In this analysis, the heat transfer on the brake disc surface is simulated and analyzed by Ansys Fluent software.

Geometry and Mesh

The geometry used in this analysis is based on the geometry of an article on the heat transfer on a brake disk. It has been modeled mathematically and published in 2011. This geometry is designed in Ansys Design Modeler software. Meshing is also modeled by Ansys Meshing software for this analysis. For the boundary between the disk and the domain of the solution, Conformal mesh has been used.

The type of meshing in the whole domain is structural. The total number of cells produced for this analysis is 198594 cells.


The effective fluid in this analysis is air, and there are no external stimuli for the fluid. Therefore, due to the Reynolds number for airflow, the Laminar flow model is used for this analysis. The energy equation is also active in this analysis. The ideal gas equation has been used to predict the variation in air density.

Boundary Condition

The solution domain is divided into two parts: Fluid and Solid. The fluid part is associated with the air, and that is considered to be constant. The solid part also refers to the disk body defined as Frame Motion and rotates at 20rad/s. The airflow input is Velocity Inlet, at a speed of 10 m/s and at a temperature of 300K. The outer walls of the solution domain are considered Stationary Wall and fully insulated.

Discretization of equations

SIMPLE algorithm is used to discretize equations. This discretization has been used for the momentum and energy equations using the First Order Upwind method.

Results are shown as temperature and fluid velocity contours.

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