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Read in Formula via Dictionary

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Old   January 23, 2016, 08:43
Default Read in Formula via Dictionary
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Hi guys,

quick question, I created an own Dict and reading in a formular via
Code:
word    cd(word(sensorDict.subDict("solving").lookup("cd")));
where cd is defined in the dict as:
Code:
cd            "1+10*Foam::exp(Re,0.66666667)";
Next I want to use this relation in my main loop, so I need to convert this word string to what exactly?

Thanks for help
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Old   January 25, 2016, 04:28
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Hi, I tried with
Code:
 #include <cstdlib>
scalar cd_form=atof(cd.c_str());
Code is now compiling and it is printing the formula as string, but not using it as mathematical operator.

Any ideas?
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Old   January 25, 2016, 04:29
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This means you will need to have a parser/interpreter. I'm not sure if there is one in OpenFOAM, yiou might have some luck with swak4Foam though.
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Old   January 27, 2016, 12:47
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I think you might want equationReader.

swak4Foam could be suitable, but if you want to parse a user-entered equation and use it at your discretion within your application, then that is exactly what equationReader was intended for. Be careful, though... any interpreted equations will take longer to evaluate than hard-coded equations.
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