Periodic Flow Heat Transfer Modeling ANSYS Fluent

Simulation of Periodic Flow Heat Transfer in ANSYS Fluent

In this tutorial, we provide guidelines for modeling and simulation of periodic flow heat transfer problem with a specific pre-generated mesh. Two-dimensional periodic heat flow modeling can be widely used in modeling steam generation in a boiler or air cooling in the coil of an air conditioner.

We model a bank of tubes containing water at a specified temperature. Then, we immerse this system of tubes in a second fluid (water) in cross flow at a different temperature. The Reynolds number of both fluids is 100. Therefore, both fluids are laminar and steady. The purpose of the simulation is to predict the flow and temperature fields that result from convective heat transfer.

We model only a portion of the geometry due to the symmetry of the tube bank and the periodicity of the flow. We redefine a periodic zone for the inlet boundary and also define the outflow boundary as its shadow.

You will also learn how to do the following through this tutorial:

• How to create periodic zones
• How to define a specified periodic mass flow rate
• Modeling periodic heat transfer and defining temperature boundary conditions
• Solving the problem with pressure-based solver
• Also, using iso-surfaces to plot temperature profiles

Problem Description of Periodic Flow Heat Transfer

We model uniformly-spaced tubes with a diameter of 1 cm. Then, we immerse the bank of tubes in a cross fluid flow. We only model a portion of the domain due to the symmetry. We use a mass flow rate of 0.05 kg/s for the inlet boundary of the periodic module. The temperature of the tube wall is 400K and also the bulk temperature of the cross flow water is 300 K. We present the properties of water used in our modeling in the training file.