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Cylindrical Heat Source CFD Simulation by ANSYS Fluent

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In this project, steady heating process of air flow in a cylindrical geometry is investigated.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Description

Problem Description

In this project, steady heating process of air flow in a cylindrical geometry is investigated. air flows in the hollow space between two concentric cylinders while constant heat source equal to 252972 W/m3 heats up the air. Air enters and exits the domain with temperature equal to 300K and 1758K respectively.

Cylindrical Heat Source Geometry & Mesh

Geometry of fluid domain is designed in Design Modeler and computational grid is generated using Ansys Meshing. Mesh type is unstructured and element number is 1600000.

Solver configuration for the Heating CFD Simulation

Critical assumptions:

  • Solver type is assumed Pressure Based.
  • Time formulation is assumed Steady.
  • Gravity effects is neglected.

The following table a summary of the defining steps of the problem and its solution.

Models
Energy On
Viscous laminar
Materials
Fluid Definition method Fluent Database
Material name Air
Density 0.84 kg/m3
Viscosity 1.7894e-05 kg/m.s
Solid Definition method Fluent Database
Material name Aluminum
Cell zone conditions
Fluid Material name Air
Solid Material name Aluminum
Source term On
Source term type Energy
Number of energy sources 1
Heat source magnitude 252972 W/m3
Boundary conditions
Mass flow inlet Type Mass flow inlet
Mass flow rate 2.315382e-6 kg/s
Temperature 300 K
Solver configurations
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Least square cell-based
Pressure Standard
Momentum Second order Upwind
Energy Second order Upwind
Initialization Gauge pressure 0 Pa
X velocity 0 m/s
Y velocity 0 m/s
Z velocity -0.008784838 m/s
Temperature 286.2 K

Results & Discussion

Air flow average velocity at inlet and out location is 0.00878484 m/s and 0.0353417 m/s respectively. This significant rise in velocity magnitude is due to reduction of cross-sectional area of flow. Air temperature at inlet and outlet is equal to 300K and 1759K respectively which is the result of heat transfer rate equal to 3.4 W/m2. In the chart , fluid temperature is shown with respect to Z increase in flow direction. It can be seen that the most major heat transfer to fluid is done in the first few centimeters of the pipe.

cylindrical heat sourceAll files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, the Training File presents how to solve the problem and extract all desired results.

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