Single vessel + cohesive sediment

In this example, you will add cohesive sediment morphology to a single vessel ship wakes example. The primary “input.txt” and vessel_00001 files are located in /simple_cases/single_vessel_cohesive/.

Model setup

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Setup “input.txt”

This example is slightly different from the previous example described in Single vessel + sediment (small domain for training session). Update the following sections:

Set a descriptive title for your simulation:

 TITLE = vessel_sediment_morph

If running in parallel, set the number of processors in X and Y:

!-----PARALLEL INFO-----
 PX = 4
 PY = 1

Set the bathymetry to the provided depth file:

 DEPTH_FILE = ./depth.txt

If a “depth.txt” is not located in the working directory, you will need to run the “mk_depth.F” Fortran script to generate a depth file, which uses the “bathy_param.txt” file as an input. You can do this by typing the following into your terminal: gfortran mk_depth.f. Refer to Grid and Computational Time for parameter definitions.

Send the results to a folder named “output”:

 RESULT_FOLDER = output/

Set the dimension of the domain to 2400 x 60 (x and y directions, respectively):

 Mglob = 2400
 Nglob = 60

Set the computational time, plot time, station printing interval, and screen interval to 2000.0 s, 5.0 s, 50,000.0 s, and 5.0 s, respectively:

 TOTAL_TIME = 700.0
 PLOT_INTV = 5.0

Keep the single vessel characteristics and sediment morphology parameters as Single vessel + sediment (small domain for training session) and somethng new for cohesive sediment

! ------  Sediment
   Bed_Change = T
   BedLoad = F
   CohesiveSediment = T
   SoftBed = T
   E_coh = 0.0001
! use default values for following parameters (comment out them)
  !D50 = 0.000005
  !Sdensity = 2.68
  !n_porosity = 0.47
  !WS = 0.0125  it will be calcuated by a formula
  !Tan_phi = 0.7
  !Kappa1 = 0.3333
  !Kappa2 = 1.0
  !MinDepthPickup = 0.1


For postprocessing examples, MATLAB scripts are located in /simple_cases/single_vessel_morphology/postprocessing/. Example model results are shown below:


Fig. 13 Shipwakes and sediment concentration at different times.


Fig. 14 Sediment concentration and bed change at t=600 sec.


Fig. 15 Bed change (upper) and wave envelope (lower) at t=600 sec.