CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   Oxy-Fuel combustion dasac failure (http://www.cfd-online.com/Forums/fluent/93315-oxy-fuel-combustion-dasac-failure.html)

Pat84 October 11, 2011 12:16

Oxy-Fuel combustion dasac failure
 
1 Attachment(s)
Hello,

Im trying to simulate a Oxy-Fuel combustion with fluent, but when I try to ignite the mixture I get a lot of failures: "dasac failure at Temperature = XXXX.XXX K: Continuing... ", where XXX.XX represents the respective temperature.

Im using a pressure based, coupled solver and the EDC combustion model. I have changed the turbulence model a few times, changed to laminar ED with stiff chemistry solver and changed to the pressure based solver, but its always the same: dasac failure.

Increasing and decreasing the isat table size and changing to direct integration is meaningless..

Im using the extended Johnson & Lindstedt reaction mechanism by Frassoldati (the mechanism is attached).
I ignite the mixture with 2000-2500K.

If someone has experience with this problem, or an idea about fixing it, helping me would be very nice.

Best regards,
Patrick

Pat84 October 12, 2011 16:01

No idea? Does someone know other (under 10-15 species) mechanisms for simulating oxy-fuel combustion?

tjushang September 21, 2014 21:50

Hi Pat84, have you figured out your problem? I encountered this dasac failure recently and I tried several ways but nothing works.


All times are GMT -4. The time now is 11:09.