Skip to content

MIKE Metocean Simulator Release Note (29 January 2026)

Release version 1.16

The highlight of this release are:

  • Improvements to running more events in addition to existing MIKE 21 SW events which were previously completed
  • Correction of unrealistic outputs when reconstructing time series

Generating additional MIKE 21SW model results: Efficiency improvements

Users can now add time series nodes to a simulation without having to re-run MIKE 21SW for nodes that were simulated previously. If there is any change to the setup, old results are overwritten.

Any sequence of MIKE 21SW runs is terminated after 23 hours so that a simulation doesn't run for more than one day. If a simulation terminates, results from completed runs are saved so that the user can initiate a new simulation to complete the remaining runs.

Correction of errors when reconstructing time series

Reconstructed time series can yield unrealistic results when using a low number of events or when simulating in shallow water. We've added validation and adjustment of outputs at completion of a simulation.

The validation procedure checks for the following:

  • Wave heights should not exceed the depth induced breaking limit.
  • Wave heights and wave period should not be negative.
  • Wave steepness should not exceed deep water steepness criteria.
  • The sum of sea and swell waves should be equal to the total wave height.

The adjustment procedure is as follows:

  • Wave heights (total) are limited to 0.78 x depth. The depth is equal to the difference between the water level from the water level forcing file and the mesh elevation.
  • If the wave height (total) is capped, then sea and swell waves are adjusted accordingly.
  • If the wave height (total) is capped, then the peak wave period is set equal to the peak wave period for either sea and swell, whichever has the highest wave height.
  • Wave heights and wave periods are set to zero if negative.
  • Wave steepness is limited to deep water steepness.
  • If the total wave height is not equal to the sum of squares of sea and swell, then it is calculated from the sum of squares of sea and swell.

Output files are adjusted according to the rules above. Unadjusted outputs are available in Cloud Admin in the files output_unadjusted.csv and output_unadjusted.dfs0. A summary of adjustments is provided in a file called adjustments.csv.

Other features and bug fixes

A summary of other features and bug fixes included in this release is given below:

Features

  • Mesh size limits: Implemented warning informing users about mesh size limits. Users are now informed that meshes with more than 175,000 elements are rejected. Users are also advised to reduce the mesh size if it exceeds 35,000 elements.
  • Boundary condition extraction: Added message confirming successful extraction of boundary conditions and forcings.
  • Points selection: Enabled immediate activation of Next button after adding point, so users can advance to the next step while boundary conditions and forcings are being prepared.

Bug fixes

  • DTU 10 forcings: Fixed bug causing DTU 10 water level forcing extraction to fail when a mesh is located entirely within a single cell of the DTU 10 grid.
  • Assisted meshing option: Fixed bug that inserted open boundary nodes at corners of auto-generated mesh when the open boundary intersects one or more islands.
  • Assisted meshing option: Changed popup message displayed after mesh interpolation. Message used to say that boundary condition extraction is underway. Message now says that boundary condition extraction is being prepared.
  • Assisted meshing option: Removed instances where it was necessary to refresh browser to view updates to mesh parameter definitions.