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New method for coupling 1D unsteady flow hydraulic models using RST equations

Abstract : This paper is devoted to the presentation and evaluation of different alternatives to couple two 1D hydraulic models based on the Saint-Venant’s equations. This presentation is first giving a short description of the coupling platform we use for these tests, namely the PALM coupling platform developed by Cerfacs. Then, we present 2 classical methods for this coupling: 1-way and 2-way. The 2-way method has itself different options depending on the variables exchanged at the coupling interface. Since we are using the implicit Preissmann scheme to solve numerically the Saint-Venant’s equations, we can imagine another option using the so-called RST equations. This method is not very intrusive into the source code since it does not require any additional calculation, and can improve a lot the results obtained by the 2 coupled models compared to the global one. This method can be implemented in an implicit way, being equivalent to the global model, or explicitly with some degradation of the results.
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  • HAL Id : hal-00783043, version 1
  • IRSTEA : PUB00037247

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P.O. Malaterre, D. Dorchies, J.P. Baume. New method for coupling 1D unsteady flow hydraulic models using RST equations. 4th Mamern International Conference on Approximation Methods and Numerical Modelling in Environment and Natural Resources, May 2011, Saidia, Morocco. p. 517 - p. 525. ⟨hal-00783043⟩

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