Unknown Species Error

[Burak Gunaydin]

Hi everyone,

I'm very new to Cantera and I'm using it on MATLAB. I'm trying to define a chemical composition, but I'm getting a ctmethods error, saying that its an Unknown Species. However, I checked the data files and I can see the compound on nasa_gas file on line 11118. Can you tell me where my mistake is? I'm attaching a pastebin link below.

https://pastebin.pl/view/28d46330  

[Steven DeCaluwe]

Hi Burak,

You are loading the GRI 3.0 mechanism, from the ‘gri30.yam’ file.  The species ’SF6’ is not part of that mechanism.

Is there a different mechanism you are trying to load?

Best,

Steven

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[Burak Gunaydin]

Hello Steven,

Thanks for your reply. After posting this, I realized that SF6 is in nasa_gas.xml and nasa_gas.xml files. However, I still can't define the composition. I ran the "help Solution" command and it returns "s = Solution('input.xml'[, phase_name[, transport_model]])". I have very limited knowledge on Cantera, but I guess I should type "nasa_gas.xml" for the input.xml part, but I couldn't figure out what I should type for phase_name. I'm adding a screenshot of the SF6 part in the nasa_gas.xml file, and the return of help Solution command below.

Thanks for your interest,

Burak

[Steven DeCaluwe]

Hi Burak,

The ’nasa_gas’ inputs contain a collection of species definitions, but no phase definitions. You can use these definitions in a file of your own making where you define the phase.

The two ways you could use this would be:

1. Copy and past this species definition into an input file where you define the overall phase.

2. In your phase definition, you can define species by direct reference to the ’nasa_gas’ definitions.  You can see an example of this here, which uses species defined in gri30.yaml:

https://github.com/Cantera/cantera/blob/main/data/sofc.yaml

Best,

Steven

On Oct 7, 2020, at 10:52 PM, Burak Gunaydin <burakgu...@gmail.com> wrote:

Hello Steven,

Thanks for your reply. After posting this, I realized that SF6 is in nasa_gas.xml and nasa_gas.xml files. However, I still can't define the composition. I ran the "help Solution" command and it returns "s = Solution('input.xml'[, phase_name[, transport_model]])". I have very limited knowledge on Cantera, but I guess I should type "nasa_gas.xml" for the input.xml part, but I couldn't figure out what I should type for phase_name. I'm adding a screenshot of the SF6 part in the nasa_gas.xml file, and the return of help Solution command below.

Thanks for your interest,

Burak<SF6 nasa_gas.jpg><help Solution return.jpg>

On Wednesday, October 7, 2020 at 7:05:24 PM UTC+3 S. DeCaluwe wrote:

Hi Burak,

You are loading the GRI 3.0 mechanism, from the ‘gri30.yam’ file.  The species ’SF6’ is not part of that mechanism.

Is there a different mechanism you are trying to load?

Best,

Steven

On Oct 7, 2020, at 12:26 AM, Burak Gunaydin <burakgu...@gmail.com> wrote:

Hi everyone,

I'm very new to Cantera and I'm using it on MATLAB. I'm trying to define a chemical composition, but I'm getting a ctmethods error, saying that its an Unknown Species. However, I checked the data files and I can see the compound on nasa_gas file on line 11118. Can you tell me where my mistake is? I'm attaching a pastebin link below.

https://pastebin.pl/view/28d46330  

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<SF6 nasa_gas.jpg><help Solution return.jpg>