A numerical study on the free-surface channel flow over a bottom obstacle

Hős, Csaba János and Kullmann, László (2007) A numerical study on the free-surface channel flow over a bottom obstacle. JOURNAL OF COMPUTATIONAL AND APPLIED MECHANICS, 8 (1). pp. 57-70. ISSN 1586-2070

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Abstract

This paper presents the results of a numerical study on a two-dimensional free-surface channel flow over a bottom obstacle. Of main interest is the capability of commercial CFD codes to solve such problems. ANSYS CFX 10.0 was used with its built-in two-phase flow model. While keeping the upstream water level in the channel constant, the downstream water level was systematically decreased, which results in increasing flow rate, supercritical flow, transcritical flow and weak hydraulic jump. The surface shapes of the subcritical CFD computations are compared to the results of the classic 1D theory. In the supercritical case, the parameters - wave crest and toe heights - of undular hydraulic jumps obtained by CFD are compared to the classic theory and to experimental results.

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