Presentation is loading. Please wait.

Presentation is loading. Please wait.

AARHUS UNIVERSITET FlexSim Janus Larsen 2011 1 The task The solution HDLite FlexSim Horsens fjord FlexSim - a simple but flexible tool for ecological fjord.

Similar presentations


Presentation on theme: "AARHUS UNIVERSITET FlexSim Janus Larsen 2011 1 The task The solution HDLite FlexSim Horsens fjord FlexSim - a simple but flexible tool for ecological fjord."— Presentation transcript:

1 AARHUS UNIVERSITET FlexSim Janus Larsen The task The solution HDLite FlexSim Horsens fjord FlexSim - a simple but flexible tool for ecological fjord modeling.

2 AARHUS UNIVERSITET FlexSim Janus Larsen 2011 The task › Make a modeling tool to: › estimate fjord modification of loads from the Danish watersheds in different scenarios › assess the ecological state in Danish fjords in different scenarios › The tool must be: › easy to implement on new fjords › have computational times in the order of minutes for yearly simulations › Wish list: › Decouple physics and biology › Separate biological and programming expertise

3 AARHUS UNIVERSITET FlexSim Janus Larsen 2011 The solution › FlexSIM › Model setup including the ecological equation system is inputted to a precompiled model engine. › Highly flexible enabling both very fast ‘box’ setups and high resolution 3D computational grids. › HDLite: Combined box model-3D model concept › Water volumes are exchanged between cells as in a box model › Fluxes between boxes are automatically calculated from the computational grid geometry and simple physical assumptions: › Stratification is created by freshwater runoff in the surface and penetration of denser salt water from the open boundaries by horizontal mixing. › Stratification is eroded by wind induced vertical mixing. › The timestep is limited only by the size of the cells and the mixing coefficients

4 AARHUS UNIVERSITET FlexSim Janus Larsen 2011 Horsens fjord Bathymetry

5 AARHUS UNIVERSITET FlexSim Janus Larsen 2011 Horsens fjord Salinity Course box model 1 year HDLite only in ~10 sec. Timestep = 3600 sec. Mixed mesh model 1 year HDLite only in <10 min. Timestep = 120 sec.

6 AARHUS UNIVERSITET FlexSim Janus Larsen 2011 Modeling without programming… 1. Copy the model engine executable to your windoze computer 2. Use a text editor to create or modify mesh, bathymetry and setup files 3. Run the engine from the command prompt with your setup file as input

7 AARHUS UNIVERSITET FlexSim Janus Larsen 2011

8 AARHUS UNIVERSITET FlexSim Janus Larsen 2011


Download ppt "AARHUS UNIVERSITET FlexSim Janus Larsen 2011 1 The task The solution HDLite FlexSim Horsens fjord FlexSim - a simple but flexible tool for ecological fjord."

Similar presentations


Ads by Google