Journal
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Volume 50, Issue 3, Pages 161-169Publisher
SOC CHEMICAL ENG JAPAN
DOI: 10.1252/jcej.16we115
Keywords
Computational Fluid Dynamics; Immersed Boundary; Pressure Poisson Equation; Complex Geometry; Microchannel
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [13J09948]
- KOZO KEIKAKU ENGINEERING Inc.
- Grants-in-Aid for Scientific Research [13J09948] Funding Source: KAKEN
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The immersed boundary (IB) method is a promising technique for the numerical simulation of complex microchannel flows. However, numerical tests revealed a loss of wall impermeability for certain flow cases leading to unphysical results when using a standard IB method. To solve this problem, we propose a novel artificial density technique incorporated in the pressure solution for IB methods. The pressure equation is modified by scaled density coefficients in IB domains, which reflects the effect the boundary screening. The proposed model is as simple and efficient as the original IB method, and it can eliminate the spurious velocity penetration. Numerical results are shown to justify this method. Its application to a branched microchannel is also presented in the last part of this study.
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