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Problem Accessing Obscure Data Variables in Fluent |
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December 10, 2013, 16:31 |
Problem Accessing Obscure Data Variables in Fluent
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#1 |
New Member
Phil
Join Date: Jun 2013
Posts: 11
Rep Power: 13 |
hi all,
I'm writing a udf to time average certain variables (for NOx model-LES-combustion) that aren't done normally by Fluent but could really use some help... Can anyone advise how to retrieve data for obscure variables such as premixed-g-equation, and species concentrations for o2 and n2 using a udf? The problem is that I need to import time-averaged data into the corresponding instantaneous data variables for the NOx post-processing model to use, but the udf manual only has the names for common variables like temperature and mixture fraction Alternatively can anyone suggest how I may be able to work out the variable names? Any help is greatly appreciated!!! |
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December 11, 2013, 13:27 |
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#2 |
Senior Member
François Grégoire
Join Date: Jan 2010
Location: Canada
Posts: 392
Rep Power: 17 |
In the udf manual release 14.5, see Table 3.8: Macros for cell flow variables... You can access species mass fractions with the C_YI(c,t,i) macro.
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December 12, 2013, 12:35 |
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#3 |
New Member
Phil
Join Date: Jun 2013
Posts: 11
Rep Power: 13 |
hi, thanks for the response!
the problem is that I am using the flamelet model so the code you gave doesn't give the species concentrations as they are mixture fraction quantities instead of being species mass fractions, I was wondering if there is any way to work out the code to use to call the variables not listed in the udf guide? ... I think another similar post suggested writing a data file to see them so possibly this is the solution |
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December 12, 2013, 12:42 |
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#4 |
Senior Member
François Grégoire
Join Date: Jan 2010
Location: Canada
Posts: 392
Rep Power: 17 |
Still in udf manual release 14.5, section 3.2.3.6.1. says you can retrieve mole/mass fractions into arrays.
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combustion, fluent, les, udf, variable |
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