Heller Indirect Dry Cooling Tower Transient Simulation, ANSYS Fluent Training

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In this project, the transient simulation of the Heller cooling tower is investigated.

This product includes a Mesh file and a comprehensive Training Movie.

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Problem description

In this project, the transient simulation of the Heller cooling tower is investigated. Heller cooling tower is a indirect heat exchanging mechanism in which airflow over water stream and heat exchange process density decreases, and an upward flow is generated. In the present work, an ideal gas model is used for air density modeling. The ideal gas density model is based on the relationship between density and local fluid temperature. Higher the temperature, lower the density, and higher the upward force on fluid volume due to buoyancy effects.

Heller Geometry and mesh

The fluid domain’s geometry is designed in Design Modeler, and the computational grid is generated using Ansys Meshing. The mesh type is unstructured, and the element number is 230000.


Heller CFD Simulation

Critical assumptions:

  • The solver type is assumed density Based.
  • Time formulation is assumed unsteady.
  • Gravity effects are considered in Y direction equal to –9.81 m/s2.

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

Models (Heller)
Viscous K-epsilon Standard
Near wall treatment Standard wall treatment
Energy on
Materials (Heller)
Fluid Definition method FLUENT database
Material name air
Density model Ideal gas
Boundary conditions
Inlet Type Pressure inlet
Gauge pressure 0 kPa
Thermal 288.61 K
Radiator Type Wall
Thermal 311.2 K
Wall thickness 1 m
Heat generation rate 51352 W/m3
Solver configurations (Heller)
Formulation Implicit
Flux type Roe-FDS
Spatial discretization Gradient Least square cell-based
Momentum Second-order Upwind
K First-order Upwind
Epsilon First-order Upwind
Run calculation Time step size Adaptive
Total time 1000 s
No. of fixed time steps 2
Initial time step size 10e-5
Max items per time step 20

Results and discussion

The pressure difference in orders of 10kPa is generated inside the cooling tower. The velocity of air, only under the influence of buoyancy force, reaches 90 m/s inside the cooling tower and reaches a maximum of 170 m/s on the edge of the cooling tower exit.

There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.


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