At its heart, MIKE 21 is a two-dimensional, hydrodynamic modeling engine. Unlike simpler one-dimensional models that simulate flow only along a river channel, a 2D model solves the depth-averaged Navier-Stokes equations (specifically the Saint-Venant equations for shallow water). This means it simulates how water moves both horizontally across a landscape and through time, accounting for variations in depth, velocity, and direction. The software’s flexible mesh technology—most notably its use of a non-structured, cell-centered finite volume method—allows it to represent complex, irregular coastlines, islands, and man-made structures with far greater precision than traditional rectangular grids. This adaptive mesh refines resolution in areas of interest (e.g., around a bridge pier or a narrow inlet) while maintaining coarser resolution in deeper, less critical zones, balancing accuracy with computational efficiency.
Running simulation...
The HD module is the backbone of any MIKE 21 simulation. It solves the 2D shallow water equations (the depth-integrated Navier-Stokes equations).
Allows for higher resolution in areas of interest and lower resolution elsewhere, optimizing computational time [5.4].
This module simulates the transport and fate of suspended matter or floating objects using a Lagrangian approach. It is widely used to model oil spills, larval drift, plastic pollution, and accidental chemical releases. Major Practical Applications
MIKE 21 is not a single tool but a collection of specialised modules that can be used independently or together in a fully dynamic coupling. This allows for the simulation of highly complex, real-world scenarios where multiple physical processes interact. The base of any MIKE 21 simulation is the , which is mandatory.
"You're pushing the mesh density too high, Elias," Sarah said, leaning over his shoulder. She smelled like coffee and ozone. "The simulation will take twelve hours to resolve if you refine the grid that much around the breakwater."
He hit Execute again.