How to modify transport properties in FreeFlame

[Chengeng Qian]

Hi everyone, 

I want to calculated laminar flame speed with transport properties approximated by polynomials. I know how to set polynomial fit to the transport properties in class Solution. But the same method doesn't work in class FreeFlame. Are there some methods to modify transport properties in FreeFlame? By the way, I use cantera via python.

Best

Chengeng

[Ray Speth]

Hi Chengeng,

If you set the polynomials on the Solution object used to create the FreeFlame, it should use the updated polynomials when calculating the properties while solving the flame. If you aren’t able to get this working, can you post an example of what you’ve tried?

Regards,
Ray

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[Bryan Weber]

Hi Chengeng,

I'm not sure what you mean by polynomial fits for transport properties, or how you're able to modify those in the Solution. Since the FreeFlame uses the Solution to evaluate the properties it needs, if it works for Solution, it seems as though it should also work for FreeFlame.

Can you attach a complete example showing what you're trying to do, what works, and what doesn't?

Thanks!

Bryan

On Wednesday, June 1, 2022 at 5:44:55 PM UTC-4 qianc...@gmail.com wrote:

[Chengeng Qian]

Hi Ray,

Thanks for your suggestions. The set_thermal_conductivity_polynomial works if I didn't set transport model while solving the flame. Please check the attachment. 

I have one more question. I didn't found the expression of polynomial fitting the thermal conductivity. Assuming that 

Solution.set_thermal_conductivity_polynomial(i, [a0, a1, a2, a3, a4]), the ploynomial will reads 

a0+a1*ln(T)+a2*ln(T)+a3*ln(T)+a4*ln(T). Is that right?

Best,

Chengeng

[Chengeng Qian]

Hi Bryan,

Thanks, it works without seting the transprot model in FreeFlame. Please check the attachement in previous letter.

Regards,

Chengeng