Revert "FDS Source: Fix bug PART_UVWMAX"

[mcgratta]

This reverts commit 74352ad.

[Suo-CY]

‘WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
WARNING: Minimum density, 0.115 kg/m3, clipped in Mesh 3
Time Step: 4023, Simulation Time: 28.03 s

ERROR: Numerical Instability - FDS stopped (CHID: 40kw_zx_t35_small)
[runfds.exe] subprocess exit: 0
’Hello teacher, I had this problem during the FDS simulation, which caused the simulation to stop early, I would like to ask what is the reason。I saw this result after looking at the out file. Thank you, thank you
40kw_zx_t35_small.txt