3.6. Calculation of Heat Transfer in 3D Pipe

In this tutorial heat transfer on a solid pipe will be studied. Case with pipe cross section will be prepared, boundary conditions and material properties will be defined on the mesh of the pipe with the help of Elmer toolbox, that is included into Elmer module. CAD file of pipe will be imported into SMITER GUI and then appropriately modified and meshed. Then the user will define material properties and boundary conditions and assign them to the mesh. In the end the computation will be run and results will be shown in the Paraview module.

3.6.1. Examine model in the GEOQ and MESH module

Navigate to ~/smiter/study/elmer-pipe and open study elmer_pipe_example.hdf. In GEOQ and MESH module the user can find the CAD model and mesh model with already defined groups for faces and volumes. Groups are defined for boundary conditions

  • heatfluxBC: Heat flux on the outer side of pipe
  • adiabaticBC: For the purpose of this tutorial, we will specify zero heat flux on the cross section of the pip
  • htcBC: surface on the inner side that is in contact with water

Fig. 3.64 CAD model of pipe in GEOM module.


Fig. 3.65 Mesh of pipe in Mesh module.

Construction of CAD and mesh groups is the same as in EHF-pipe tutorial. Navigate to ELMER module as shown in figure Fig. 3.66


Fig. 3.66 Select ELMER option to move to Elmer module.

Examine ELMER tree structure in Object Browser


Fig. 3.67 Elmer general case in Object Browser.

Right-click on cylinder_heat_transfer and click Edit case. The dialog in figure Fig. 3.68 appears on screen.


Fig. 3.68 Dialog for editing ELMER case.

Under Select case type tick option 3D. Then click on Equations. The dialog in figure Fig. 3.69 is shown on the screen. We can see that heat transfer equation is active.


Fig. 3.69 Dialog to select equation of the ELMER case.

In similar way one can examine defined boundary conditions by clicking on Boundary conditions and material properties by clicking on Materials. With *Object properties the user can assign boundary conditions and materials to mesh groups, as discussed in EHF finger tutorial. After finishing, click Save case to ELMER study. Right-click on cylinder_heat_transfer and click Compute case.

The result is stored in folder elmer-compute, that is stored in home directory. Inside elmer-compute folder is a folder cylinder_heat_transfer and inside is case0001.vtu, that contains temperature distribution on the pipe. Navigate to Paraview folder and load the file. Temperatures are shown in figure Fig. 3.69.


Fig. 3.70 Temperatures on pipe.