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Radiator Heat Transfer Inside a Room Transient CFD Simulation

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The problem is simulating heat transfer by a radiator inside a room by a transient solver.


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Project Description

The problem is simulating heat transfer by a radiator inside a room. In fact, the radiator is attached to one of the room’s sidewalls, which acts as a heat source. The radiator consists of hot water flow pipes and aluminum fins. It is assumed that the hot water flow inside the pipes has a constant temperature, and as a result, the body of the pipes has a constant temperature equal to 353 K.

The walls of the room have a thickness of 0.3 m, which has convection heat transfer with outside; Thus, the ambient air temperature is assumed to be 284 K and the convection heat transfer coefficient is assumed to be 8 W.m-2.K-1. The purpose of this study is to investigate the rate of heat transfer from the radiator to the interior of the room using natural convection and the buoyancy effect. Therefore, the gravity effect is applied to the model.

Radiator Geometry & Mesh

The present 3-D model is drawn using the Design Modeler software. The present model consists of a room in the shape of a rectangular cube with dimensions of 4 m * 3 m * 3 m and a radiator inside it and connected to one of its sidewalls. The following figure shows a view of the geometry.


The meshing of the model has been done using ANSYS Meshing software and the mesh type is unstructured. The element number is 4148881. The following figure shows the mesh.


CFD Simulation

To simulate the present model, several assumptions are considered:

  • We perform a pressure-based solver.
  • The simulation is transient.
  • The gravity effect on the fluid is equal to -9.81 m.s-2 along the z-axis.

A summary of the defining steps of the problem and its solution is given in the following table:

(Radiator) Models
Viscous model k-epsilon
k-epsilon model standard
near-wall treatment standard wall function
Energy on
Boundary conditions
Water walls in the radiator wall
wall motion stationary wall
temperature 353 K
Room walls wall
                         (Radiator) wall motion stationary wall
convection heat transfer coefficient 8 W.m-2.K-1
free stream temperature 284 K
Fin walls in the radiator wall
wall motion stationary wall
thermal condition coupled
(Radiator) Solution Methods
Pressure-velocity coupling   Coupled
Spatial discretization pressure second-order
momentum second-order upwind
turbulent kinetic energy second-order upwind
turbulent dissipation rate second-order upwind
energy second-order upwind
(Radiator) Initialization
Initialization method   Standard
gauge pressure 0 Pascal
velocity (x,y,z) 0 m.s-1
temperature 293.15 K

Radiator Results

At the end of the solution process, two-dimensional and three-dimensional velocity, temperature, and pressure contours, as well as pathlines and velocity vectors are obtained.


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

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


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