SET-UP

The triple-jet flow represents the flow used to cool components within nuclear reactor systems and has been investigated in Choi & Kim (2007). The experimental set-up dimensions is shown in the figures below.

 

 

CFD simulations of this flow have been set-up using the NEAT code of Prof. Paul Tucker. The zip file below contains all of the files necessary to run the triple jet simulations.

Download 'triplejet.zip' (200kb)

 

20/12/08: As requested by Yongmann, an identical code set-up but with only the central jet can be downloaded below:

Download 'singlejet.zip' (200kb)

The following files should be noted:

- tjetnew3.f: The main source code. This needs to be compiled before running

- neatcomnew.inp: The input file which contains the running parameters for a brand new simulation

- neatcom.inp: As above but allows the simulation to carry on from where it left off.

 

RESULTS

3rd February 2009 

Although the results produced previously worked well up to a point, the outlet boundary conditions were causing backflow back up the channel and so making the jets 'surge'. This is shown in both the u-Velocity & Temperature contour movies shown below:

u-Velocity Contours (03-02-09)

Temperature Contours (03-02-09)

This is probably due to the outlet boundary condition as the velocity along the centreline is not pinned down at the outlet and this is shown below:

u-Velocity along the centreline (03-02-09)

This outlet condition has now been changed to a steady outlet condition based on preserving continuity. (I.e. the mass flux into the domain is now equal to that flowing out). The simulations have been set running again with the new condition and there should be proof of it working well within the next few days.

 

3rd January 2009

Current Simulations run to: 0.15 sec

Total Run-time to date: 19 hours

Current Speed (using -O5 compilation): 38min for 1 run simulating 0.005sec

Predicted Time remaining to complete 5 sec of running: 25.6 days

Predicted Date to complete 5 sec of running: 29th January 2009

 

Temperature Probe Results

 

 

 

Temperature (left) & u-Velocity (right) Contours