Dhi Mike 21 Guide

MIKE 21 is a professional engineering software package developed by DHI used to simulate in a wide range of water bodies, including rivers, lakes, estuaries, bays, coastal areas, and oceans. While DHI offers other specialized modeling systems like MIKE 11 for 1D river flows and MIKE SHE for fully integrated surface and groundwater hydrology, MIKE 21 fills the crucial role of 2D and quasi-3D simulations , providing a detailed, spatially-distributed understanding of water processes.

Designed for highly detailed wave simulations in ports and harbors, accounting for wave reflection, diffraction, refraction, and non-linear wave-wave interactions. dhi mike 21

How does MIKE 21 compare to competitors like Delft3D (Deltares), TUFLOW (BMT), or HEC-RAS 2D (USACE)? MIKE 21 is a professional engineering software package

The Classic engine utilizes a Cartesian grid where the study area is divided into uniform square cells. This grid setup is highly efficient for localized, structured environments like small harbors, simple channels, or straightforward laboratory flumes. While computationally fast, it can struggle to smoothly map highly irregular or curved coastlines without using very small, resource-intensive cell sizes. 2. MIKE 21 FM (Flexible Mesh) How does MIKE 21 compare to competitors like

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.

Modern versions of MIKE 21 leverage the processing power of modern graphics cards (GPUs). This acceleration drastically cuts down simulation times for complex, high-resolution models from days to hours.

At the heart of the system is the , which simulates unsteady 2D free-surface flows based on a finite volume method on an unstructured mesh. The flexible mesh approach is a key advantage, allowing you to refine the model's resolution in critical areas (e.g., near structures or complex coastlines) while keeping it coarser elsewhere, creating a more accurate and computationally efficient model.