How does FLUENT predict next step temperature?

valahian1 · February 13, 2015, 11:59

Hi there!

In a combustion of gaseous mixture, I use Composition PDF Transport model, transient and pressure based, with species specific heat defined by polynomials and the reaction is Arrhenius dependent. I need to know how FLUENT predicts the next time step temperature, if you can help me. What formula does it use? In user guide I found properties dependent by temperature, but the temperature is dependent by WHAT?!

Thank you!

LuckyTran · February 13, 2015, 20:09

I suggest reading some introductory texts on the finite volume method.

http://en.wikipedia.org/wiki/Finite_volume_method

It depends on the temporal discretization scheme and whether the solution of the scheme is implict or explicit. In explicit scheme, it is a forward marching of the problem in time based on values at the current time-step (see also the shooting method). In the implicit scheme, it involves solving system of equations for the unknown temperatures at the new time-step using the available information at the previous time-step.

valahian1 · February 13, 2015, 21:24

Thanks a lot! It does not help me; I want to know how FLUENT INCREASES THE TEMPERATURE FOR FOLLOWING STEP. Not equations in a general mode. FLUENT does not respect even what is wrote in it's user guide.

February 13, 2015, 11:59	How does FLUENT predict next step temperature?	#1
valahian1 Member Nick Join Date: Feb 2012 Posts: 33 Rep Power: 14	Hi there! In a combustion of gaseous mixture, I use Composition PDF Transport model, transient and pressure based, with species specific heat defined by polynomials and the reaction is Arrhenius dependent. I need to know how FLUENT predicts the next time step temperature, if you can help me. What formula does it use? In user guide I found properties dependent by temperature, but the temperature is dependent by WHAT?! Thank you!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[openSmoke] libOpenSMOKE	Tobi	OpenFOAM Community Contributions	562	January 25, 2023 09:21
AMI interDyMFoam for mixer nu problem	danny123	OpenFOAM Programming & Development	8	September 6, 2013 02:34
Can fluent predict temperature in Entrance region(Tube)	mohammadkm	FLUENT	0	May 12, 2010 04:16
temperature, k-epsilon, & Fluent	rp	FLUENT	0	February 23, 2004 14:28

February 13, 2015, 20:09		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,665 Rep Power: 65	I suggest reading some introductory texts on the finite volume method. http://en.wikipedia.org/wiki/Finite_volume_method It depends on the temporal discretization scheme and whether the solution of the scheme is implict or explicit. In explicit scheme, it is a forward marching of the problem in time based on values at the current time-step (see also the shooting method). In the implicit scheme, it involves solving system of equations for the unknown temperatures at the new time-step using the available information at the previous time-step.

February 13, 2015, 21:24		#3
valahian1 Member Nick Join Date: Feb 2012 Posts: 33 Rep Power: 14	Thanks a lot! It does not help me; I want to know how FLUENT INCREASES THE TEMPERATURE FOR FOLLOWING STEP. Not equations in a general mode. FLUENT does not respect even what is wrote in it's user guide.