Fire dynamic simulator : Fuel density regarding

pv_cfd · September 7, 2021, 02:11

hi all,
I am working on fires at different altitudes (reduced air pressures) and using Pyrosim interface. Used volume flow rate (area*vel) to specify the rate of flow.
I am using methane as fuel and the density of the fuel will also be less at higher altitudes.

My doubt is whether I need to use a mass flow rate inlet and reduced mass flow rate to accommodate the variation in density of fuel with altitude.

I have set the simulation parameters- reduced pressure and reduced oxygen fraction already.

Will FDS take this fuel density variation automatically if I specify a volumetric flow inlet?

beckham86 · October 1, 2024, 05:35

When simulating fires at different altitudes using Pyrosim, it's crucial to consider the variation in fuel density. While specifying a Among Us volumetric flow inlet, FDS does not automatically adjust for changes in fuel density due to altitude. Therefore, using a mass flow rate inlet with the reduced mass flow rate is advisable to accurately reflect the lower density of methane at higher altitudes.

Siedegi8o · November 30, 2024, 05:39

Fire dynamic simulators are essential tools for understanding fuel density and its impact on fire behavior. Exploring interactive platforms like crazy games can complement learning by offering engaging ways to grasp dynamic systems and simulation concepts.

September 7, 2021, 02:11	Fire dynamic simulator : Fuel density regarding	#1
pv_cfd New Member praveen Join Date: Sep 2021 Posts: 1 Rep Power: 0	hi all, I am working on fires at different altitudes (reduced air pressures) and using Pyrosim interface. Used volume flow rate (area*vel) to specify the rate of flow. I am using methane as fuel and the density of the fuel will also be less at higher altitudes. My doubt is whether I need to use a mass flow rate inlet and reduced mass flow rate to accommodate the variation in density of fuel with altitude. I have set the simulation parameters- reduced pressure and reduced oxygen fraction already. Will FDS take this fuel density variation automatically if I specify a volumetric flow inlet?

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October 1, 2024, 05:35		#2
beckham86 New Member beckham Join Date: Oct 2024 Posts: 6 Rep Power: 2	When simulating fires at different altitudes using Pyrosim, it's crucial to consider the variation in fuel density. While specifying a Among Us volumetric flow inlet, FDS does not automatically adjust for changes in fuel density due to altitude. Therefore, using a mass flow rate inlet with the reduced mass flow rate is advisable to accurately reflect the lower density of methane at higher altitudes.

November 30, 2024, 05:39		#3
Siedegi8o New Member Skye Gardiner Join Date: Nov 2024 Posts: 1 Rep Power: 0	Fire dynamic simulators are essential tools for understanding fuel density and its impact on fire behavior. Exploring interactive platforms like crazy games can complement learning by offering engaging ways to grasp dynamic systems and simulation concepts.