dasac failure at temperature 540K continuing

Weiqiang Liu · June 4, 2020, 02:44

Hi all,

I am doing a reacting flow with fluent. While iterating, fluent will complain a warning: dasac failure at temperature continuing. However, iteration can continue without error.

I am wondering why would this happen? will this effect final calculated results?

Best regards

Weiqiang

vinerm · June 4, 2020, 06:29

Refer

Methane Combustion

Weiqiang Liu · June 4, 2020, 10:08

Quote:

Originally Posted by vinerm

Refer

Methane Combustion

Hi, Vinerm

Thanks very much for the sharing.

Best regards

Weiqiang

Gbeatz · June 24, 2022, 08:19

From my experience with the error, here are my thoughts:
1. Try making the mesh courser, I read somewhere that the easiest way to fix the error is to fix your mesh (avoid unnecessary refinement),
2. If fixing the mesh is not an option, look into the turbulence models, usually a model that allows near-wall treatment options to be used can do the trick,
3. My go-to option personally is to shy away from mass flow inlet boundary specifications but rather perform necessary calculations so they become velocity inlets.

I hope this helps someone.

June 4, 2020, 02:44	dasac failure at temperature 540K continuing	#1
Weiqiang Liu Senior Member Weiqiang Liu Join Date: Feb 2018 Posts: 278 Rep Power: 9	Hi all, I am doing a reacting flow with fluent. While iterating, fluent will complain a warning: dasac failure at temperature continuing. However, iteration can continue without error. I am wondering why would this happen? will this effect final calculated results? Best regards Weiqiang

June 4, 2020, 06:29	DASAC failure	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	Refer Methane Combustion __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

June 24, 2022, 08:19	Dasac Failure at temperature	#4
Gbeatz New Member Garikai Marangwanda Join Date: Dec 2013 Posts: 6 Rep Power: 13	From my experience with the error, here are my thoughts: 1. Try making the mesh courser, I read somewhere that the easiest way to fix the error is to fix your mesh (avoid unnecessary refinement), 2. If fixing the mesh is not an option, look into the turbulence models, usually a model that allows near-wall treatment options to be used can do the trick, 3. My go-to option personally is to shy away from mass flow inlet boundary specifications but rather perform necessary calculations so they become velocity inlets. I hope this helps someone. Naturel1990 likes this.

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