The Design – 3D Pully With Arm Simulation in CFD | ANSYS Fluent


In most CFD projects, we design geometry, create a static mesh for geometry, and simulate this by fix mesh. But sometimes we want to move some boundary or we have deforming shape during times. We must use the dynamic mesh method. For example, in most aerodynamic problems we use fix mesh for our simulation but you can imagine there are two airplanes that are getting closer and you want to know the effect of fluid flow behavior around airplanes and determine the interaction between them during the time. So the relative position them are changing during the time and should be modeled using the dynamic mesh method. By using this method, mesh size and shape will be changed. If we use the re-meshing or layering method, the number of an element also will be changed. The dynamic mesh method is entirely different from moving and sliding mesh also moving reference frames. In moving mesh whole zone rotates or translates in some direction but in dynamic mesh, the method boundary starts to translate or transform. We can apply a predefined velocity by UDF or profile for boundaries or velocity of an object that can be predicted based on fluid flow and gravity force balance. If we want to know the velocity of the object based on this balance we should use the Six DOF dynamic mesh method.

Mesh quality during change should be conserved. ANSYS fluent has three different methods for changing mesh, smoothing, re-meshing, and layering.

In this analysis, it has been tried to simulate and analyze the scaled residuals an ocillating pendulum flow using dynamic mesh [part 3].


The Design – 3D Pully With Arm Simulation in CFD | ANSYS Fluent

This simulation is about a pulley with an arm via ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis.

A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt or transfer of power between the shaft and cable or belt. In the case of a pulley supported by a frame or shell that does not transfer power to a shaft, but is used to guide the cable or exert a force, the supporting shell is called a block, and the pulley may be called a sheave.

A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain.

The earliest evidence of pulleys dates back to Ancient Egypt in the Twelfth Dynasty (1991-1802 BCE) and Mesopotamia in the early 2nd millennium BCE. In Roman Egypt, Hero of Alexandria (c. 10-70 CE) identified the pulley as one of six simple machines used to lift weights. Pulleys are assembled to form a block and tackle in order to provide mechanical advantage to apply large forces. Pulleys are also assembled as part of belt and chain drives in order to transmit power from one rotating shaft to another. Plutarch’s Parallel Lives recounts a scene where Archimedes proved the effectiveness of compound pulleys and the block-and-tackle system by using one to pull a fully laden ship towards him as if it was gliding through water.

This analysis has tried to simulate and analyze the modeling of a pulley with an arm using ANSYS Fluent software.

Geometry & Grid

The geometry required for this analysis was generated by Ansys Design Modeler software. The meshing required for this analysis was also generated by Ansys Meshing software. The mesh type used in this analysis is unstructured. The total number of volume properties for geometry is 5,1118e+006 mm³.


K-epsilon (2 equation) model has been used for fluid flow inside the design modeler and the simulation considers air phenomena. So, Case will be initialized with mixed pressure are solved.

Boundary Condition

The momentum input for this geometry is considered as Moving Wall in Wall Motion, at a constant speed of rotational velocity is 225 rad/s. The momentum of the shear condition is also considered as No Slip. The motion of the design modeler is defined as Relative to Adjacent Cell Zone for the circular outer domain boundary condition.

Discretization of Equations

According to the type of flow, the SIMPLE algorithm is used to discretize the Pressure-Velocity Coupling of the solution method. The momentum equation has been discretized in the Second Order Upwind.

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