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The Design – Immersed Cycloidal Gear Simulation | ANSYS CFX

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Buoyancy is the upward force exerted on an object when it is immersed, partially or fully, in a fluid – and strictly where the fluid is subjected to a gravitational force but is not in free fall – and its value is equal to the weight of the fluid displaced by the object. All objects that are surrounded by air or water on the surface of the Earth experience buoyancy to some degree. Buoyancy cannot affect the mass of an object; by definition, mass is a measure of the amount of material in a body, and immersing it in a liquid does not change the amount. It cannot affect weight either as this is the gravitational force acting on a mass. But buoyancy can and does alter our perception of both mass and weight by affecting the measurement processes, making it more difficult.

Free convection has attracted the attention of researchers in recent years. It is because of the kind of displacement in nature and its applications in engineering.

In this analysis, we tried to simulate and analyze flow buoyancy and buoyancy effect in a 3-d structure Using ANSYS CFX software.

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The Design – Immersed Cycloidal Gear Simulation | ANSYS CFX

Buoyancy is the upward force exerted on an object when it is immersed, partially or fully, in a fluid – and strictly where the fluid is subjected to a gravitational force but is not in free fall – and its value is equal to the weight of the fluid displaced by the object. All objects that are surrounded by air or water on the surface of the Earth experience buoyancy to some degree. Buoyancy cannot affect the mass of an object; by definition, mass is a measure of the amount of material in a body, and immersing it in a liquid does not change the amount. It cannot affect weight either as this is the gravitational force acting on a mass. But buoyancy can and does alter our perception of both mass and weight by affecting the measurement processes, making it more difficult.

Free convection has attracted the attention of researchers in recent years. It is because of the kind of displacement in nature and its applications in engineering.

In this analysis, we tried to simulate and analyze flow buoyancy and buoyancy effect in a 3-d structure Using ANSYS CFX 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 casing geometry is 1.e+005 mm³. The total number of volume properties for gear geometry is 58848 mm³.

Model

In this analysis,  a transient analysis type was used to obtain the results to check the fluid flow. In this analysis, non-buoyant models have been used and stationary domain motion has also been activated in this analysis. In this analysis, a k-Epsilon model was used to study the water flow and thermal energy fluid models of heat transfer.

Boundary Condition

The flow input for this geometry of a cycloidal gear directs the flow of air at a fluid temperature of 25 C into the geometry. The turbulence boundary condition of a cycloidal gear wall is considered to be k-Epsilon according to the working conditions. The wall function is defined as Scalable in the name selection section of the turbulence boundary condition. The static pressure for the design modeler is set as relative pressure equal to 1 Pa. The turbulence for the design modeler is set with an intensity equal to 5 %.

Discretization of Equations

Due to the type of heat transfer in this analysis, a Second Order Backward Euler is used to solve the transient equations. An RMS residual type has been used for convergence criteria with a residual target equal to 1.E-4.

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