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Tuberías a Presión y Gravedad Simultáneamente.

How to simulate pipes that operate under pressure and gravity simultaneously with SewerGEMS?
Which solvers are recommended (GVF-Convex, GVF-Rational, Implicit or Explicit) and what design
tools should be used? Any guide please, thank you. In the image the red line represents the HGL

  • Reply in English

    Hello Frank, 

    For designing pressure and gravity systems, GVF-Convex solver is recommended, since it is best for complicated pumping, pressure sewers, extended period simulations. 

    Whereas Implicit / Explicit solver are suitable for dynamic routing, where dynamic surcharging and ponding is considered in modeling. 

    Here is detailed explanation about which solver to use for which modeling condition. 

    Differences between solvers: GVF-Convex vs. GVF-Rational vs. Implicit vs. Explicit (SWMM)

    About tools to be used for modeling and how to model gravity and pumping mains with GVF-Convex solver, please use the link to learning resource guide where several tutorials, videos are available for learning. 

     Learning Resource Guide for New Users of Bentley SewerCAD

    Google translated reply in Spanish

    Hola frank

    Para el diseño de sistemas de presión y gravedad, se recomienda el solucionador GVF-Convexo, ya que es mejor para bombeo complicado, alcantarillas de presión, simulaciones de período extendido.
    Mientras que el solucionador implícito / explícito es adecuado para el enrutamiento dinámico, donde se considera la sobrecarga dinámica y el ajuste en el modelado.

    Aquí hay una explicación detallada sobre qué solver usar para cada condición de modelado.

    Diferencias entre los solucionadores: GVF-Convex vs. GVF-Rational vs. Implicit vs. Explicit (SWMM)

    Acerca de las herramientas que se utilizarán para el modelado y cómo modelar la gravedad y el bombeo de la red con el solucionador GVF-Convex, use el enlace de la guía de recursos de aprendizaje donde hay varios tutoriales y videos disponibles para aprender.

    Guía de recursos de aprendizaje para nuevos usuarios de Bentley SewerCAD

    Regards,

    Sushma Choure

    Bentley Technical Suppport

  • To add to Sushma's reply - it looks like you may be trying to model "cascading" flow. Normally if this situation involves an upstream pump, you would use the air valve element in SewerCAD (or the GVF-Convex solver in SewerGEMS) to approximate the hydraulic grade line in such situations. This is explained in the following article from our Wiki: Modeling Force Mains with Air Valves in SewerCAD (GVF Convex Solver) Also see this related forum discussion.

    However if the flow is by gravity from the source to the downstream end, with part-full flow at various points as indicated in your diagram, I would recommend trying the Implicit or Explicit (SWMM) solver in SewerGEMS. It should be able to calculate the hydraulic grade similar to your diagram.

    If you need further help, please tell us a bit more about your project and what you need the hydraulic model to tell you (or what problems you need it to help you solve).


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

    Answer Verified By: Frank Esteban Ibarra 

  • Please note that a subsequent reply to this thread has been split to a new thread here: Divert sewer pipe without manhole


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.