July 15, 2020 at 2:07 pmGeoDesySubscriber
I am trying to model a jet flame using the GRI-3.0 mechanism which contains 53 species in conjuction with a SLW UDF for the calculation of the absorption coefficient.
For the simulations I am using Fluent 19.2.
The UDF works for mechanisms with a lower number of species, however when I try to add the GRI-3.0 mechanism I get the following error:
Received signal SIGIOT.
and on the Linux terminal I get:
*** stack smashing detected ***
The UDF works by defining user-defined-gray-bands. I also tried to use Fluent 15 and I get the 50 species limitation error message.
As far as I understand this error causes fluent to abort due to wrong memory allocations.
So I was wondering, is the calculation of user-defined-gray-bands still capped at 50 species? And if it is, is there any solution to my problem?
July 16, 2020 at 2:48 pmRobAnsys Employee
Not sure, but I don't tend to model combustion systems. If you alter the mechanism to 49 species does it work?
July 16, 2020 at 2:53 pmGeoDesySubscriber
I did use a different mechanism GRI-2.11 with 49 species while using the exact same code and it works. I also reduced the GRI-3.0 and using the same code it works.
July 17, 2020 at 10:35 amRobAnsys Employee
Then there must be a limit. I'll query on our side as it may be an oversight when some of the other limits were lifted.
July 23, 2020 at 1:28 pmGeoDesySubscriber
So is there any update on the query on your side?
July 24, 2020 at 2:04 pmRobAnsys Employee
Species should be fine, there may be a limit on the grey bands.
July 24, 2020 at 3:52 pmGeoDesySubscriber
I tried runs with 1,2,5 and 10 bands and I still get the same error. When I do the same with 36, 49 and 50 species the simulations proceed like they should.
So is there any way to circumvent this limit?
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