HELP; Ansys 13.0 Combustion Problem!
I desperately need assistance with the following problem. I have been trying to do combustion analysis for a couple of months now and have a repeating problem. During the solution portion of the simulation on FLUENT 13.0 I have the following read out on each time step...
"Minimum PDF table temperature in 9893 cells on zone 3"
The number of cells fluctuates greatly. I have a video of each step that I have done at the link below.
I have tried increasing the mesh, increasing the fuel and oxid temperatures without any results
DISREGARD THE FLOW RATES IN THE VIDEO! I have corrected them and they are not connected to the error.
THANK YOU IN ADVANCE!
the tips you found here in the forum, the advanced features has to be enabled via the TUI command, not the graphic interface...
Thank you so much for your speedy response!
I just realized where the TUI interface is on Fluent 13.0. Right smack in front of me!
I will try it and get back to you.
Again I greatly appreciate your help
Well I have tried to find the option for the Maximum Heat Loss Fraction and have not been able to find it. The following is as far as I got through the TUI command window. If anyone can help I would GREATLY appreciate it!
adapt/ file/ report/
close-fluent mesh/ solve/
define/ parallel/ surface/
display/ plot/ views/
beta-feature-access materials/ profiles/
boundary-conditions/ mesh-interfaces/ solution-strategy/
custom-field-functions/ mixing-planes/ turbo/
dynamic-mesh/ models/ units
enable-mesh-morpher-optimizer? operating-conditions/ user-defined/
acoustics/ heat-exchanger/ steady?
addon-module multiphase/ unsteady-1st-order?
crevice-model? radiation/ unsteady-2nd-order-bounded?
dpm/ solidification-melting? unsteady-2nd-order?
energy? solver/ viscous/
diffusion-energy-source? off? thermal-diffusion?
inlet-diffusion? save-gradients? volumetric-reactions?
Thanks for all the replies. I was finally able to find the location where I could lower the Maximum Heat Loss Fraction! You were correct it is under "non-premixed-combustion-expert". Originally it was set to 0.66, I set it to 0.4 and ran the simulation again. Unfortunately this did not help fix the error. I still have "minimum pdf table temp" error occuring on every iteration and to many cells.
I have also tried reducing the under relaxation factor for Energy to 0.6 and this did not help either.
I have increased the mesh as well as increased the inlet temperature to 600K for the fuel and the oxide to no avail.
I have noticed that my P1 residuals are acting strangely though. They are far below the other residuals.
change the minimum temperature in the limits !!!!
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