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    2026 FGWS On-Demand Session Seismic Analysis using with reservoir as Sloshing Fluid and Wave Absorbent Boundary

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    AI Summary
    • Explores seismic loading approaches including Pseudo-static, Response Spectrum, and Nonlinear Time History for concrete gravity dams.
    • Compares Westergaard’s added mass method with sloshing fluid modeling to evaluate hydrodynamic forces and dynamic interaction.
    • Highlights limitations of the added mass method in representing time-dependent fluid response and complex geometries.
    • Demonstrates implementation of wave absorbent boundary conditions and full analysis workflow in MIDAS FEA NX.
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    Description

    Seismic Analysis of a Concrete Gravity Dam

    Hydrodynamic Load Application Using Sloshing Fluid Modeling

    This on-demand session focuses on  Seismic analysis of concrete gravity dams is not only about structural inertia.
    It is about understanding how the reservoir dynamically interacts with the dam during earthquake motion. Hydrodynamic pressure, wave propagation, and boundary reflection effects can significantly amplify structural response if not modeled properly:

    • Hydrodynamic forces generated during seismic excitation

    • Fluid–Structure Interaction using Westergaard’s added mass and sloshing medium approaches

    • Limitations of simplified added mass methods

    • Implementation of wave absorbent boundary conditions for realistic reservoir modeling

     

    How It Works 

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    On-Demand Session Overview

    01. Seismic Loading in Concrete Gravity Dams

    • Comprehensive Load Consideration: Dead load, hydrostatic pressure, uplift, and earthquake forces.
    • Seismic Analysis Approaches: Pseudo-static, Response Spectrum, and Nonlinear Time History.

     

    02. Hydrodynamic Forces & Fluid–Structure Interaction (FSI)

    • Added Mass Concept: Westergaard’s method for equivalent hydrodynamic pressure.
    • Dynamic Interaction: Frequency-dependent hydrodynamic pressure and inertia coupling.

     

    03. Limitations of Added Mass Method

    • Impulsive-Only Representation: Does not capture full time-dependent fluid response.
    • Geometry Restriction: Applicable primarily to vertical upstream faces.

     

    04. Sloshing Fluid Modeling

    • Explicit Fluid Dynamics: Free-surface motion, wave propagation, and pressure variation.
    • True FSI Modeling: Realistic dam–reservoir interaction under seismic excitation.

     

    05. Wave Absorbent Boundary Condition

    • Non-Reflecting Reservoir Boundary: Prevent artificial wave reflection.
    • Reflection Coefficient Control: Simulate infinite reservoir behavior in limited numerical domain.

     

    06. Practical Implementation in MIDAS FEA NX

    • Model Components: Concrete dam, rock foundation, and sloshing fluid domain.
    • Analysis Workflow: Geometry → Material → Mesh → Loads → Nonlinear Time History → Results.

    This session is for you if you are…

    Performing seismic analysis of gravity dams and need realistic hydrodynamic loadings

    Evaluating dam–reservoir interaction under earthquake excitation

    Using added mass methods but concerned about their limitation

    Speaker

    Darshan C R Technical Support Engineer MIDAS R&D Center Pvt. Ltd
     Darshan C R is a Geotechnical Engineer with experience in numerical modeling and finite element analysis using MIDAS GTS NX. He holds a Master’s degree in Geotechnical Engineering from IIT Madras. He specializes in applying finite element methods to address a wide range of geotechnical engineering challenges, including slope stability, foundation analysis, excavations, tunneling, and soil–structure interaction problems.
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    FAQs

    General Q1. Is this session free of charge? Expand or Collapse
     A. Yes! The 2026 FGWS On-Demand Series is completely free of charge. Once the form submitted, you’ll get access to on-demand sessions and learning materials — at no cost. 
    General Q2. How do I get the training license? Expand or Collapse
     A. You can apply through the form above. Once submitted, your training license will be issued for immediate use.
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