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 on: February 12, 2020, 03:01:30 am 
Started by roborob - Last post by roborob

I am new to Pyrosim, I was expecting there to be a function that would give me some feedback on CPU usage so I accurately predict how long the simulation would take (and optimise). Is there something like this? For example:
-A graph of seconds simulated per step/wall clock time per step.
-A breakdown of what % of the time is spent in each routine as the simulation progresses. i.e. what percentage of the simulation is in PART/COMM/FIRE etc, perhaps every 30 seconds or so. so I can see where to optimise.

I think this would be really useful, for example, before I used Pyrosim I would look at the cpu.csv with excel and I noticed that all my runs were going half the speed from Friday night to Monday morning. My sims were running on Windows computers that I would access with RDP and when I shut down the RDP session the simulations would still run, but because they were not in console mode (but effectively in the log in screen mode) windows would slow down the CPUs. It was so much easier to diagnose this when you have a graph of simulation speed against simulation time. Same goes for  PART slowdown when I am doing a sprinkler simulation, way easier to see with a  graph.

I suppose I could just make a standard excel file to do this, but I just want to see if Pyrosim has it built in first.

 on: February 11, 2020, 11:25:15 am 
Started by alabastrolas - Last post by alabastrolas
Hello everyone,
I'm new using this program and I'm using it for my Master thesis related with the study of "heat island effect" in cities. I would like to know if you have any idea to create a sun movement across the day simulation. When the sun rises up till the sunset, in real time and with the radiation characteristics.
Any idea about the topic or the sun simulation is more than welcome!
Thank you very much.

 on: February 08, 2020, 11:16:58 am 
Started by M Hod - Last post by Nikolaos Kapellas
Hello there,
My name is Nikolaos Kapellas and i am currently doing my dissertation which is a safety assessment on Reliquefaction systems on LNG carriers.
More specifically, i would like to ask you how am i able to simulate a gas dispersion of methane leaking from a reliquefaction plant i have imported from Autocad?
Furthermore, i can assure you that i have understood how to do a fire simulation on a room via the PyroSim Example Guide and the Pyrosim Manual. The only way i saw simulating a gas dispersion of methane was to supply it with a vent and an open vent, but i spotted that i can also add species and reactions. finally when i am doing the simulation with the vent i am not getting any Heat Release Rate Results only Q Radiation.
Please help me,
Kind Regards,
Nikolaos Kapellas, 4th year Marine Engineering Student at the University of Strathclyde, Glasgow

 on: February 06, 2020, 05:51:30 pm 
Started by tonydb - Last post by tonydb
A run was 211s into a 600s simulation when I wanted to STOP and resume the next day.

I clicked STOP in the Pyrosim Run dialog until it replied with "STOPPED by user...."

The next day I Resumed the run using the Analysis menu and straightaway the run stopped due to Numerical Instability.

Being suspicious, I saved the file with a new name and started the run from the start.

It has gone past the point where it was "Numerically Unstable" and is now showing at t=326, 1.5s per 100 time steps in the log entry (ie looking good to finish without instability).

Can anyone offer an explanation?

 on: February 06, 2020, 05:39:01 pm 
Started by tonydb - Last post by tonydb
I have drawn a HOLE using the user interface, but when I look at Record View there is no HOLE, nor is there any line with the ID of my HOLE.
It also is not in the .fds file generated by Pyrosim.

Why is this?

How does the HOLE get activated/deactivated by a control in these circumstances?

 on: February 06, 2020, 05:31:36 pm 
Started by tonydb - Last post by tonydb
I have created a HOLE in an Obstruction to represent my door.
It will be a door for only 18 seconds while occupants egress.

The occupants will open the door 90 seconds after a device (smoke detector) has activated.
The smoke detector activated at t=39s (discovered by running the model).

I, therefore, need the HOLE to exist from t=129 to t=147 only.

I have done this by using a "Time" Control and Multiple actions (activate,deactivate) based on the above times.

What I really want is this to happen automatically.

I have seen an earlier post on Activate/deactivate" but could not understand how it works.

I would be grateful for some FDS code that I could paste into the Custom window or, alternatively, a way to get it done using Pyrosim features.

 on: February 05, 2020, 04:46:22 am 
Started by Wali - Last post by Wali
Hello Everyone,

I am working on a performance-based design solution, and I check one of the coolest ways to present the ASET and RSET contour map (see link below).

Can we plot the same ASET vs RSET map from pyrosim and pathfinder output or any other better way of results representation?

Thanks in advance

 on: January 31, 2020, 04:41:11 pm 
Started by Teiter - Last post by Teiter
Gracias Guillermo, finalmente conseguí hacerlo funcionar añadiendo un louver. Un saludo.

 on: January 27, 2020, 04:17:30 am 
Started by Teiter - Last post by GuillermoLoste
Hola Teiter

¿Cuál es el problema exactamente? Que el flujo va hacia arriba?

Un saludo

 on: January 25, 2020, 05:49:23 am 
Started by Teiter - Last post by Teiter
I'm trying to model a 50N-thrust centrifugal jet fan, as seen in Captura.jpg

but at the simulation, in the 2D velocity slice I see the flow goes to the ceiling.
Anyone can tell me what am I doing wrong in the model?
I attach the psm file.

Thank you very much.
(excuse me for my english)

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