Running Multiple Numeric Models

Smarter surface-water modeling requires more than just about choosing a model, it’s about leveraging the right combination. With the Surface-water Modeling System (SMS), engineers can run multiple numerical models such as CMS-Wave, ADCIRC, STWAVE, and many more within a single project to evaluate the same hydraulic system from multiple angles, turning comparisons into actionable insights. When executed strategically, multi-model workflows strengthen validation, reveal sensitivities, and improve decision-making.

Below, we explore how leveraging multiple numerical models in SMS can transform your modeling workflow, while avoiding the pitfalls that undermine results.

Benefits of Using Multiple Models in SMS

1. Model Comparison and Validation: Running multiple numeric models on the same SMS project geometry lets engineers compare results, validate assumptions, and uncover numerical sensitivities early. This improves accuracy and credibility of the analysis. For example, you might create a TUFLOW-FV model for a river and use SRH-2D to validate the results. 

2. Purpose-Driven Modeling: Each model excels in its area. For example, one project might use ADCIRC for coastal circulation and storm surge, CMS-Wave for wave dynamics, and STWAVE for detailed wave transformations. SMS lets you reuse meshes, boundaries, and observation points, reducing setup time and maximizing efficiency.

3. Scenario Testing: Multi-model SMS workflows enable rapid testing of design alternatives and flow conditions. SMS manages simulations independently, letting you adjust solver-specific parameters without altering the project geometry, giving you faster, smarter insights.

Pitfalls to Watch Out For

1. Different Assumptions and Physics: Each numerical model within SMS uses unique formulations, turbulence treatments, and boundary handling. Awareness of these differences ensures results are interpreted correctly and confidently because, even with identical inputs, variations in results reflect solver behavior

2. Boundary Condition Compatibility: Not all boundary conditions in SMS may transfer seamlessly between models. Careful review and adjustments are required to ensure the boundary conditions from each model you use transfer correctly. Often features on one boundary condition coverage will need to be moved to another coverage to keep your simulations accurate and reliable.

3. Mesh and Time Step Constraints: A mesh or time step that works well in one SMS model may destabilize another. SMS makes geometry reuse easy, but numerical suitability must be carefully evaluated for each solver remains essential.

4. Project Complexity: As simulations multiply, Multi-model SMS projects can become challenging to manage.Well-structured simulations, consistent naming, and proper documentation reduce confusion and save time as well as keeping projects manageable and efficient.

Best Practices in SMS

• Use shared coverages strategically to maintain consistent boundaries and observation points across SMS model simulations.

• Clearly label simulations by model and purpose to keep multi-model SMS projects organized and easy to interpret.

• Compare results using SMS plotting and animation tools  to quickly identify trends,validate assumptions, and communicate findings clearly.

• Document solver-specific assumptions to ensure results remain transparent, defensible, and easy to communicate while improving credibility and reducing risk.

Ready to Get More Value from Your Multi-Model SMS Workflow?

A well-executed multi-model SMS workflow unlocks deeper understanding of coastal and wave-driven systems. By combining multiple numeric models in one organized project, engineers can test scenarios faster, compare results more effectively, and strengthen design decisions. This approach turns SMS into a powerful platform for advanced surface-water analysis.

Download SMS and start maximizing confidence, efficiency, and insight in your surface-water modeling projects.