How fluent will define heat flux while running the simulation

hariswch2 · September 10, 2015, 06:43

Hi CFD users

I have given heat source condition of 100W to one component in cell zone option in Fluent.

I would like to know how fluent will take this 100W in simulation i.e., is it start from 0 to 10w then 20w...to 100W or directly it will apply 100W to specific component in both steady and transient problem or else it will take some time(or some iterations) to apply total wattage ??

thanks in advance

LuckyTran · September 10, 2015, 13:41

That condition is fixed for the simulation and does not depend on time or iteration. There is no ramping or slow increase.

Your energy source should be a volumetric heat source with units of W/m^3. Are you sure you inputted 100W?

hariswch2 · September 11, 2015, 00:00

Thank u for quick reply lucky

yes, i have inputted 100W as volumetric heat source in W/m3 only. what i observed in steady state for subsequent iterations, That value is slowly increasing w. r.t iterations and same thing i observed for transient also

the wattage value i am measuring in total heat transfer rate option in fluxes (post processing) for that component.

i dont know why it is slowly increasing and even w.r.t iterations it is crossing 100W also.

Can u plz help me what might be the problem

September 10, 2015, 06:43	How fluent will define heat flux while running the simulation	#1
hariswch2 New Member Surya Join Date: Jan 2014 Posts: 20 Rep Power: 12	Hi CFD users I have given heat source condition of 100W to one component in cell zone option in Fluent. I would like to know how fluent will take this 100W in simulation i.e., is it start from 0 to 10w then 20w...to 100W or directly it will apply 100W to specific component in both steady and transient problem or else it will take some time(or some iterations) to apply total wattage ?? thanks in advance

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September 10, 2015, 13:41		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,667 Rep Power: 65	That condition is fixed for the simulation and does not depend on time or iteration. There is no ramping or slow increase. Your energy source should be a volumetric heat source with units of W/m^3. Are you sure you inputted 100W?

September 11, 2015, 00:00		#3
hariswch2 New Member Surya Join Date: Jan 2014 Posts: 20 Rep Power: 12	Thank u for quick reply lucky yes, i have inputted 100W as volumetric heat source in W/m3 only. what i observed in steady state for subsequent iterations, That value is slowly increasing w. r.t iterations and same thing i observed for transient also the wattage value i am measuring in total heat transfer rate option in fluxes (post processing) for that component. i dont know why it is slowly increasing and even w.r.t iterations it is crossing 100W also. Can u plz help me what might be the problem