Eddy correlations for water flow in a single fracture with abruptly changing aperture

• DOI: 10.1002/hyp.8332
• Publication Date: 2011-11-09T16:46:27Z
• Authors: Jiazhong Qian; Min Liang; Zhou Chen; Hongbin Zhan
• Keywords: Aperture (computer memory); Lattice Boltzmann methods; Eddy

Abstract Fluid flow in single fractures with non‐uniform apertures is an important research subject many disciplines. The abruptly changing aperture a special case of such non‐uniformity. This paper simulates water fracture (SF‐ACA) using the Lattice Boltzmann Method (LBM) and Finite Volume (FVM). occurs Reynolds number ( Re ) ranging from 5 to 900 ratio change E 3 = D/d , where D d are larger smaller apertures, respectively). For values between 100, both LBM FVM can successfully simulate eddy development expansion regime SF‐ACA. Flow high (up 900) simulated by FVM, which appears be numerically more stable than for high‐ problems studied here. symmetry breaks at value 400 500. Our simulation result shows linear relationship l 1 / low (5–100) or higher (110–900) values, defined as length location abrupt right edge first along direction. If considering results entire range (5–900), d–Re better described non‐linear logarithmical function. approaches asymptotic constant large . Copyright © 2011 John Wiley & Sons, Ltd.