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Cooling Process of a Hot Rotating Steel Structure, ANSYS Fluent Training

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In this project, the unsteady cooling process of a hot rotating steel structure is investigated.

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

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Description

Cooling Project description

In this project, the unsteady cooling process of a hot steel structure is investigated. In the exact model, the structure is rotating around Z-axis. The actual simulation involving rotation and resulting forced convection requires extreme computational resources. However, in this simulation, the structure is assumed to be rigid, and heat transfer boundary conditions on each surface are modified in such a manner to mimic the forced convection effects in rotation. In this project, the only energy equation is solved. Free stream convection heat transfer coefficients of red, yellow, and blue sections are considered equal to 80, 90, and 73 w/K.m2, respectively. The free stream flow temperature is assumed to be 243K. Volume average temperature of the whole structure at the start of the simulation and after 1000s is equal to 308.15K and 259.44K, respectively.

Geometry & Mesh

This project’s 3D geometry is modeled in Design Modeler, and the computational grid is generated using Ansys Meshing software. Mesh type in structured and element number is 600405.

coolingMr CFD

Cooling CFD Simulation Settings

Critical assumptions of this simulation are:

  • Solver type is assumed to be Pressure-Based.
  • Time formulation is Transient.
  • The gravity effect is ignored.

The applied settings are recapitulated in the following table.

models
Viscous Laminar

(is then deactivated in Controls)

Energy On
Material properties
Steel Definition type Fluent database
Density 8030 kg/m3
Specific heat 502.48 j/kg.K
Thermal conductivity 16.27 W/m.K
Cell zone conditions
Zone name Fluid
Material name Steel
Boundary conditions
Tube Type Convection
Heat transfer coefficient 73 W/m2.K
Free stream temperature -30 C
Table Type Convection
Heat transfer coefficient 90 W/m2.K
Free stream temperature -30 C
Type Convection
Box Heat transfer coefficient 80 W/m2.K
Free stream temperature -30 C
Type Convection
Solver configuration
Pressure velocity coupling Scheme PISO
Spatial discretization Gradient Least square cell-based
Pressure Standard
Momentum First order Upwind
Energy First order Upwind
Initialization Gauge pressure 0 Pa
X velocity 0 m/s
Y velocity 0 m/s
Z velocity 0 m/s
Temperature 35 C

Results & Discussion

Contours of temperature at different simulation times are extracted and presented .

As shown in the chart below, which shows the volume average temperature of the structure as moving further in time, the cooling down rate is very high at the beginning, but as time passes temperature of the structure begins to reach a steady-state which has not yet occurred so far (1000s).

cooling

All 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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