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Empirical equations in OpenFOAM

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Old   May 14, 2024, 02:34
Default Empirical equations in OpenFOAM
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Sagar
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Hello Foamers,

I want to add temperature dependent empirical formula in my solver calculation.

For example:
1) p = a + b*T+ c*T^2
2) p = A*exp(B/T)
where p and T both are volScalarField having dimensions of pressure and temperature respectively.
And a, b, c, A, B are constant values.

I know both are empirical formula and dimensionally imbalance on LHS and RHS.

To handle this type of equation, I have come across one method by giving dimensions to a,b,c,A,B using dimensionedScalar.

Is there any other-way to handle these type of equations in OpenFOAM?
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Old   May 14, 2024, 11:20
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Quote:
To handle this type of equation, I have come across one method by giving dimensions to a,b,c,A,B using dimensionedScalar.

Is there any other-way to handle these type of equations in OpenFOAM?
I doubt it. When adding terms, they must clearly have the same dimensions, otherwise it is not physical. You could try making T dimensionless, but I would just perservere with setting the correct dimensions for the coefficients. The dimension checking is a good error trap for your coding.
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