How can i approximate Darcy coefficient and Forchheimer coefficient?
Hi, I'm wooseok.
I'm doing some Flow analysis which included Porous media layers.(urethane foam and the leather with fine holes)
and i found Acusolve follows some formulas.
but i found i need to approximate some properties. (Darcy coefficient, Forchheimer coefficient)
I've found other ways to approximate internet information but I'm not sure if they're the right formula for our acusolve..
i think i can do Flow analysis for getting pressure drop about the leather.
and can i help for next steps? ><
Best Answer
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WOOSEOK_22213 said:
i will get pressure drop data from Flow analysis. with different velocity.
it will be tough but gonna make fine mesh geometry about leather layers.Once you have velocity vs pressure drop - you can use HyperWorks CFD to determine the coefficients - as in this tutorial:
https://help.altair.com/hwcfdsolvers/acusolve/topics/tutorials/acu/acu_6500_intro_cfd_r.htm#acu_6010_intro_cfd_r
That calculator will be added to SimLab at a later date
This is the main description page for the Porosity Model in the Command Reference Manual:
https://help.altair.com/hwcfdsolvers/acusolve/topics/acusolve/porosity_model_acusolve_com_ref.htm1
Altair EmployeeAnswers
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Not sure how one would 'estimate' the values. Generally you'll need experimental data capturing the curve of velocity versus pressure drop across the porous medium - in your case likely the 'stack' of foam plus perforated leather
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acupro_21778 said:
Not sure how one would 'estimate' the values. Generally you'll need experimental data capturing the curve of velocity versus pressure drop across the porous medium - in your case likely the 'stack' of foam plus perforated leather
i want to replace the experiment with analysis.
I'm trying to use some formulas like this.https://holzmann-cfd.com/community/blog-and-tools/darcy-forchheimer
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WOOSEOK_22213 said:
i want to replace the experiment with analysis.
I'm trying to use some formulas like this.https://holzmann-cfd.com/community/blog-and-tools/darcy-forchheimer
Yes - that page also has a velocity versus pressure drop curve (though only two data points). Not sure what you would do without that information
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acupro_21778 said:
Yes - that page also has a velocity versus pressure drop curve (though only two data points). Not sure what you would do without that information
i will get pressure drop data from Flow analysis. with different velocity.
it will be tough but gonna make fine mesh geometry about leather layers.0 -
WOOSEOK_22213 said:
i will get pressure drop data from Flow analysis. with different velocity.
it will be tough but gonna make fine mesh geometry about leather layers.Once you have velocity vs pressure drop - you can use HyperWorks CFD to determine the coefficients - as in this tutorial:
https://help.altair.com/hwcfdsolvers/acusolve/topics/tutorials/acu/acu_6500_intro_cfd_r.htm#acu_6010_intro_cfd_r
That calculator will be added to SimLab at a later date
This is the main description page for the Porosity Model in the Command Reference Manual:
https://help.altair.com/hwcfdsolvers/acusolve/topics/acusolve/porosity_model_acusolve_com_ref.htm1 -
acupro_21778 said:
Not sure how one would 'estimate' the values. Generally you'll need experimental data capturing the curve of velocity versus pressure drop across the porous medium - in your case likely the 'stack' of foam plus perforated leather
You could find pressure drop correlations for different porous media, screens and etc from here. Handbook of hydraulic resistance: https://www.nrc.gov/docs/ML1220/ML12209A041.pdf
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