View source for Mathematical Model TRIM-2D

[[Category: Mathematical Models]]
[[de: Mathematisches Verfahren TRIM-2D]]
==Short Description==
The mathematical model TRIM-2D is based on the finite difference method. TRIM-2D was designed to solve several depth-integrated transient nonlinear partial differential equations (pde's). The model is actually used to study one ore more of the following physical processes:

# transport of water (conservation of the water mass)
# transport of linear momentum (conservation of linear momentum)
# transport of salinity (conservation of the dissolved salt mass)
# transport of suspended sediments with consideration of resuspension and deposition at the bottom (conservation of the suspended sediment mass)
# bed load transport (a transport capacity approach is used)
# evolution of the bottom (morphodynamics) due to suspended load as well as bed load transport

TRIM-2D was jointly developed by Prof. V. Casulli (Trento University, Italy) as well as Prof. R. T. Cheng (US Geological Survey, Menlo Park, California). In the framework of a scientific cooperation TRIM-2D has been successfully installed in the year 1994 at BAW-DHs computers. It has been integrated into BAW-DHs numerical modelling toolbox and is now used on a routine basis in the context of different real-world projects concerning estuarine flow and transport processes. Meanwhile the capabilities of the model were extended and new physical processes have been included.
Furthermore the program was parallelized using [http://openmp.org/wp/ OpenMP]-directives for SMP ([http://burks.brighton.ac.uk/burks/foldoc/5/114.htm symmetric multiprocessing]) systems in a portable way.
==Standard Validation Document==
There exists a Standard Validation Document (in German only) for TRIM-2D which provides the potential user with information about the capabilities and limitations of the model. This document may be downloaded either as [http://www.baw.de/downloads/wasserbau//mathematische_verfahren/Modellverfahren/pdf/trim2d1.pdf PDF-Version] or as a compressed [http://www.baw.de/downloads/wasserbau/mathematische_verfahren/Modellverfahren/zip/trim2d.zip PostScript-Version].
==Preprocessors==
* [[Generation of Boundary Conditions]]
* [[Generation and Modification of Computational Grids]]
==Programs for Simulations==
* [[TR2VOR]]: generation of a compact version of the bathymetry-file together with some index arrays which are required during the simulation run for optimal performance on vector computers
* [[TR2LQ2]]: generation of a profile topography which is necessary to output results from a TRIM-2D simulation run along profiles
* [[TRIM-2D]]: simulation run
==Postprocessors==
* [[Conversion of Computed Results]]: general purpose prostprocessors for the conversion of data.
* [[Analysis of Calculated Results]]: tidal characteristic numbers, tide-independent characteristic numbers, tidal harmonic analysis and comparative analysis.
* [[EXCEL-Applications|Spread-Sheet Calculations for Computed Results]]: application of the spread-sheet program MS Excel (TM) to display and modify computed results.

* [[TR2MODATE]]: modification of date and time in a hydrodynamic results file if this hydrodynamic state should be used as initial state for a different date
* [[TR2KACHEL]]: generation of sections (tiles); topography as well as data are cut into pieces out of the result files for the entire computational domain for any desired section (tile)
* [[PARTRACE]]: particle tracking within a two-dimensional depth-averaged velocity field
* [[GVIEW2D]]: graphical display of time series at selected locations
* [[LQ2PRO]]: Visualization of data along profiles
* [[HVIEW2D]]: graphical display of 2D synoptic or data analyses results
* [[VVIEW2D]]: Two-dimensional graphical representation of CFD-data for vertical sections
==Example Applications==
* Hydrodynamics of the Elbe Estuary: A comprehensive study concerning hydrodynamics, salt- and bedload transport in the Elbe Estuary.
* Suspended Sediment Transport: Demo-Example (available in German only).
* [[Example: Animation of Salinity in the Außenweser Estuary|Animation of tidal variability of salinity in the Außenweser Estuary]].
* [[Example: Animation of Water Level Elevation and Flow Velocity in the Inner Jade Estuary|Animation of Water Level Elevation and Flow Velocity in the Inner Jade Estuary]].
* [[Tidal Characteristic Numbers of Current|Tidal characteristic numbers of current velocity for the Weser Estuary]].
* [[Tidal Characteristic Numbers of Salinity|Tidal characteristic numbers of salinity for the Weser Estuary]].
* Modeling the propagation of dunes in a straight channel (available in German only).
* [[Example: Vortex Streets behind a planned Storm Surge Barrier in the Unterems|Animation of vortex streets behind a planned storm surge barrier in the Unterems]].
----
back to [[Mathematical Models for Coastal Areas and Estuaries]]
----
[[Overview]]