Thunderhead Engineering Forum

Please login or register.

Login with username, password and session length
Advanced search  

News:

Forum moved to https://forum.thunderheadeng.com

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - Michele

Pages: 1 [2]
16
PyroSim / EVAC : Random Seed
« on: February 02, 2010, 08:53:40 am »
Hi,
in the Evac properties there is a flag possibility on "Use Random Seed".
When flagged, the FDS command "NOT_RANDOM=.TRUE." is added to the code line. The initial position and characteristics of the agents will therefore NOT chosen randomly (I suppose will be the same as the previous simulation).
This means that flagging the "Use Random Seed" results in NON-random agents selection (which is in contrast with the flag name...).

Is this interpretation correct?

Thanks
Michele

17
PyroSim / Re: Importing FDS+EVAC files
« on: February 02, 2010, 03:28:18 am »
On the User's guide is indicated both FDS and EVAC version.
Installed FDS version can be easily checked by editing "fds5" on cmd line.
1. How can I check the installed EVAC version?
2. Does Pyrosim refer to the separate installed FDS+EVAC or did it install its "own" FDS+EVAC?
3. Do the default EVAC parameter in Pyrosim correspond to the installed EVAC version or may there have some differences?

18
PyroSim / Importing FDS+EVAC files
« on: February 01, 2010, 09:47:56 am »
Hi,
I'm trying to import FDS+EVAC validation files "Case A" from http://www.vtt.fi/proj/fdsevac/fdsevac_validation.jsp, but every time Pyrosim crashes.
With "Case B" an error message is displayed ("Error in file ... For input string: "0.3" ").
All FDS files run with no problem if lounched from outside Pyrosim, so they should be correct written.
Can anyone help me?
Thanks
Michele

19
PyroSim / Extinguishing coefficient
« on: February 01, 2010, 02:11:26 am »
Extinguishing coefficient in Pyrosim (E_COEFFICIENT in FDS) has unit [1/s].
Exact unit value should be m2/kg/s, right?

20
PyroSim / Re: Simulation of evaporation LNG
« on: February 01, 2010, 02:09:13 am »
I'm also not sure to undersatand your issue. If you just want a pool (or puddle) of LNG to evaporate, act as in FDS user Guide chapter 8.3.3 Liquid Fuels.
Set initial material internal temperature at -161°C (or whaterver) and ambient temperature at T > -161°C.
Evt use SUPPLY Surface to introduce fresh warmer air to maintain ambiente temperature above LNG temperature.

Michele

21
PyroSim / Re: Initial Region Temperature vs Ambient temperature
« on: January 25, 2010, 01:45:37 pm »
So you mena that even though it is reported at the beginning (before the HEAD_CHID) it will be considered when computing the FDS?

22
PyroSim / Initial Region Temperature vs Ambient temperature
« on: January 25, 2010, 04:54:59 am »
Hi,
in FDS there is the possibility of having a region with initial temperature different from ambient temperature. The code line is like the following (example from "stack_effect" in FDS)
&INIT XB=0.5,0.8,2.1,3.4,2.5,3.6, TEMPERATURE=30. /
where the region XB is associated an initial air temprature of 30°C (ambient temperature can be default or other values)
 
Unfortunately this command is not recognized when importin the FDS file in Pyrosim.

Is there the possibility of having this command/action in Pyrosim?

thanks a lot
Michele

Pages: 1 [2]