Fast and stable approximation of laminar and turbulent flows in channels by Darcy’s Law
نویسندگان
چکیده
In the design of flow geometries consisting channels such as high-temperature gas heat exchangers, a great number parameters can be chosen, why solving turbulent Reynolds Averaged Navier-Stokes (RANS) equations by CFD coupled with other physics become computational demanding. Therefore, we here propose method for significant reduction resources and consequent high speed. This is done using less demanding Darcy’s Law (DL) to approximate laminar flows in circular arbitrary cross-sections. To obtain right velocity profile, an artificial permeability variation across cross-section channel determined. obtained based on analogy DL Darcy–Weisbach equation (DW). Results demonstrate that approximations predict velocities pressures distributions from cross-sections very well. At same time, models reduce runtime up ~40 times compared RANS, improve stability convergence model. Lastly, cross-flow exchanger studied application approximations.
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ژورنال
عنوان ژورنال: alexandria engineering journal
سال: 2021
ISSN: ['2090-2670', '1110-0168']
DOI: https://doi.org/10.1016/j.aej.2020.12.033