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The Design – Simulation Natural Convection & Specular Reflection Steady State Analysis | ANSYS CFX

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Natural convection is a type of flow, of motion of a liquid such as water or a gas such as air, in which the fluid motion is not generated by any external source (like a pump, fan, suction device, etc.) but by some parts of the fluid being heavier than other parts. In most cases, this leads to natural circulation, the ability of a fluid in a system to circulate continuously, with gravity and possible changes in heat energy. The driving force for natural convection is gravity. For example, if there is a layer of cold dense air on top of hotter less dense air, gravity pulls more strongly on the denser layer on top, so it falls while the hotter less dense air rises to take its place. This creates a circulating flow: convection. As it relies on gravity, there are no convection in free-fall (inertial) environments, such as that of the orbiting International Space Station. Natural convection can occur when there are hot and cold regions of either air or water because both water and air become less dense as they are heated. But, for example, in the world’s oceans, it also occurs due to saltwater being heavier than fresh water, so a layer of saltwater on top of a layer of fresher water will also cause convection.

Specular reflection, or regular reflection, is the mirror-like reflection of waves, such as light, from a surface. The law of reflection states that a reflected ray of light emerges from the reflecting surface at the same angle to the surface normal as the incident ray, but on the opposing side of the surface normal in the plane formed by the incident and reflected rays. This behavior was first described by Hero of Alexandria (AD c. 10–70). Specular reflection may be contrasted with diffuse reflection, in which light is scattered away from the surface in a range of directions.

In this analysis, it has been tried to simulate and analyze Natural Convection Heat Transfer on a Solid Cylinder using Ansys Fluent software.

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The Design – Simulation Natural Convection & Specular Reflection Steady State Analysis | ANSYS CFX

Natural convection is a type of flow, of motion of a liquid such as water or a gas such as air, in which the fluid motion is not generated by any external source (like a pump, fan, suction device, etc.) but by some parts of the fluid being heavier than other parts. In most cases, this leads to natural circulation, the ability of a fluid in a system to circulate continuously, with gravity and possible changes in heat energy. The driving force for natural convection is gravity. For example, if there is a layer of cold dense air on top of hotter less dense air, gravity pulls more strongly on the denser layer on top, so it falls while the hotter less dense air rises to take its place. This creates a circulating flow: convection. As it relies on gravity, there are no convection in free-fall (inertial) environments, such as that of the orbiting International Space Station. Natural convection can occur when there are hot and cold regions of either air or water because both water and air become less dense as they are heated. But, for example, in the world’s oceans, it also occurs due to saltwater being heavier than fresh water, so a layer of saltwater on top of a layer of fresher water will also cause convection.

Specular reflection, or regular reflection, is the mirror-like reflection of waves, such as light, from a surface. The law of reflection states that a reflected ray of light emerges from the reflecting surface at the same angle to the surface normal as the incident ray, but on the opposing side of the surface normal in the plane formed by the incident and reflected rays. This behavior was first described by Hero of Alexandria (AD c. 10–70). Specular reflection may be contrasted with diffuse reflection, in which light is scattered away from the surface in a range of directions.

In this analysis, it has been tried to simulate and analyze Natural Convection Heat Transfer on a Solid Cylinder 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 geometry is 1,3232e+006 mm³.

Model

In this analysis,  a steady-state 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 air at 25 C flow and total energy fluid models of the heat transfer.

Boundary Condition

In this analysis, the no-slip wall has been used to determine the mass and momentum in the material fluid and particle basic settings of the design modeler. And the mass flux pressure coefficient value of mass and momentum for heated is 5 [Kg s^-1 m^-2 Pa^-1] and for cooled is 10 [Kg s^-1 m^-2 Pa^-1].

Discretization of Equations

In this analysis, high-resolution is used for the advection scheme of the basic settings. In this analysis, the first-order is used for turbulence numerics. In this analysis, the residual type of convergence criteria is RMS and the residual target of convergence criteria is 1.E-4.

The results are presented as velocity contours as well as streamlines.

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