Rotating Disk Effect on Surrounding Airflow CFD Simulation, ANSYS Fluent

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The present problem simulates a rotating disk in a room using ANSYS Fluent software.

This product includes a Mesh file and a comprehensive Training Movie.

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Project Description

The present problem simulates a rotating disk in a room using ANSYS Fluent software. The purpose of this work is to investigate the airflow behavior under the influence of rotational motion of a rotating disk. In this simulation, there is an air flow in a computational domain (room) and in the middle of this room, a rotating disk with a certain rotational speed is placed. To define the rotational motion of a disk, the boundary condition of a moving wall with a speed of 5 rad.s-1 must be used.

Rotating Disk in a Room Geometry & Mesh

The present model is designed in three dimensions using Design Modeler software. The geometry of the model consists of a room measuring 0.5 m * 0.5 m * 1 m, in the middle of which there is a rotating disk 0.02 m thick and 0.1 m in diameter.

rotating disk

The meshing of the model has been done using ANSYS Meshing software and the mesh type is unstructured. The element number is 716870. The following figure shows the mesh.

rotating disk

Rotating Disk CFD Simulation

To simulate the present model, several assumptions are considered:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is ignored.

A summary of the defining steps of the problem and its solution is given in the following table:

Viscous Laminar
Boundary conditions
Outlet-Disk Wall
wall motion moving wall
speed 5 rad.s-1
Wall-Room Wall
wall motion stationary wall
Pressure-velocity coupling SIMPLE
pressure second order
momentum second order upwind
Initialization methods Hybrid


At the end of the solution process, we obtain two-dimensional and three-dimensional contours related to pressure, velocity, as well as velocity vectors. Since the disk output is defined as a moving wall, the rotating disk has its maximum velocity at this output boundary. By moving away from this boundary, the velocity decreases. As the velocity vectors show, the current under This rotation separates from the surface of the disk. Due to the low rotation speed of the disk, this separation is also slow. As the velocity volume contour shows, the room air velocity has slightly increased in this area near the rotating disk. The pressure has also decreased. These results can be seen symmetrically on both the back and the front of the disc.

There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.


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