FINITE-ELEMENT MODEL FOR HIGH-VELOCITY CHANNELS

Numerical models of high-velocity channels must capture the supercritical transitions and discontinuities in the flow field, known as hydraulic jumps. The implied smoothness of a numerical scheme can produce false oscillations near jump locations and lead to instability. Also, the discrete numerical procedures must preserve the Rankine-Hugoniot conditions and accurately model jump speed and location. Using an unstructured model, the geometric complexity of high-velocity channels with bridge piers and service ramps are easily represented. A two-dimensional finite-element model that utilizes a characteristic based Petrov-Galerkin method and a shock-detection mechanism that relies on elemental energy variation results in a robust system to model high-velocity channels. Analytic shock-speed results, published laboratory data of lateral contraction, and a more general physical model are compared.

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  • English

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  • Accession Number: 00712685
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 4 1995 12:00AM