The software is used to simulate flood extents, often favored over other models like HEC-RAS for its flexibility in mesh generation and superior handling of complex geometries [5.4].
One of the most significant advancements in MIKE 21 is the introduction of the Flexible Mesh (FM) engine. Traditional Cartesian grids struggled to represent irregular boundaries, such as winding riverbanks or circular bridge piers, without using incredibly small grid sizes that slowed down computation.
Engineers, oceanographers, and environmental consultants rely on MIKE 21 to solve critical engineering challenges. These range from assessing coastal erosion and designing resilient harbor infrastructures to modeling storm surges, inland flooding, and aquatic water quality. Core Architecture and the Flexible Mesh (FM) Advantage
After calibration, validate with independent data (e.g., a different storm event). Then run scenarios: “design flood,” “future climate SLR +20cm,” or “new breakwater alignment.” dhi mike 21
"There," Elias pointed.
| Software | Type | Key Difference | | :--- | :--- | :--- | | | Flexible mesh, process-based | Free, but less polished UI; strong academia support. | | TELEMAC-MASCARET (open source) | Finite element | Powerful, but steeper learning and less commercial support. | | FVCOM (open source) | Unstructured, 3D | Excellent for estuaries; no integrated GUI. | | HEC-RAS (free) | 1D/2D | Superior for river hydraulics/flooding, weaker for waves. | | OpenFOAM (open source) | General CFD | More detailed turbulence, but impractical for large domains (slow). |
No water system exists in isolation. MIKE 21 doesn't just model surface water; it connects with other specialized DHI software. The platform enables seamless coupling between models for comprehensive flood analyses. This is crucial in urban environments where water moves between streets, sewer networks, and rivers. Many flood studies utilize MIKE FLOOD to couple a 1D model (like MIKE URBAN for pipe networks) with a 2D model ( MIKE 21 ) to simulate surface flooding accurately. The software is used to simulate flood extents,
MIKE 21 is modular. You typically start with the module, then add others:
In the old days, engineers used flumes and tanks—physical models that took months to build. Now, they fought their battles in the digital realm. Elias was essentially building a digital twin of the entire coastline, brick by digital brick. He was asking the software to solve the Navier-Stokes equations millions of times over, predicting where every cubic meter of water would decide to go.
"Overtopping starts at Hour 14," Elias calculated. "Maximum inundation at Hour 16. The port is currently planning for a 1.2-meter surge. This model is showing 1.8." ensure triangles have aspect ratios <
Using the (or third-party tools like SMS), create a computational mesh. For structured grids, use the old MIKE 21 Grid Generator. For FM, ensure triangles have aspect ratios <10 and smooth transitions.
Designing breakwaters, optimizing port layouts, checking harbor agitation, and planning beach nourishment projects.
, developed by , is a professional engineering software suite for simulating 2D free-surface flows in estuaries, coastal waters, and seas. It is primarily used when vertical stratification can be neglected, focusing on depth-averaged water environments. www.dhigroup.com Core Capabilities MIKE 21-3 | Coast and Marine Water Modelling Software - DHI