flame height comparison using HRRPUL and a HRRPUV slice file with slread.m

[HJPark]

Hi everyone, 

I am comparing the flame heights calculated from: 

1. a HRRPUV slice file using slread.m., and 

2. a DEVC with HRRPUL. 

I became to have several questions and hope you can help me understand this better. 

I used the "FH_test.fds" file attached. I slightly modified "Qs=1_RI=05.fds" from the FDS validation files. I added 19 slice files at the cell boundary including the mesh boundary along the x axis.  

The domain size of each slice file is 18 by 20 cells.(JK values) 

Here are my questions: 

1. Which one is recommended between locating the slice files at the cell boundary or in the middle of cell (or somewhere in the cell)? What would be the difference between these two? FDS moves slice files to the nearest cell boundaries? 

2. The spatial domain size of T from slread.m is 21 by 19, which is one cell larger than 18 by 20. I I thought one at each direction may be a dummy cell, but not really. Then I though these may be cell boundary values and averaged four values (both J and K directions) and got 18 by 20 values, but this resulted in values quite off from the HRRPUL values from the DEVC line. How can I decrease this to 18 by 20 to match HRRPUV? 

3. When I compare HRRPUL as shown in the FH_test_line.csv file, they don't match perfectly. I guess one of the reasons for this may be I misaligned the cells (either HRRPUL or slic efiles or the data from slread.m). At the end, I got 20 values of HRRPUL from the devc, and 21 values from the HRRPUV analysis from slice files.  Can anyone fix the attached matlab or post a correct matlab analysis file for slice file data? 

Thank you very much. 

Haejun

[Kevin]

Use CELL_CENTERED=.TRUE. on the SLCF lines. This will give you the actual value of the QUANTITY in each cell.