Numerical Wave Tank based on High-Order Spectral method

This README file describes the different cases that might be computed with HOS-NWT and gives instructions to set the numerical parameters n1 to p2.

Setting the value of integers n1, n2, M, p1 and p2 in common_vars.f90

For a 2D simulation, Compile with n2=1 AND p2=1 to adjust the memory allocation to minimum

If partial dealiasing is used, compile with p1 set to maximal required value (total dealiasing is obtained with p1=M but it can be reduced if p1 is further set to a value below M)

## 3D simulation

For a 3D simulation, Compile with n2\=1 AND p2 set to required value

If partial dealiasing is used in x-direction, compile with p1 set to maximal required value (total dealiasing is obtained with p1=M but it can be reduced if p1 is further set to a value below M)

If partial dealiasing is used in y-direction, compile with p2 set to maximal required value (total dealiasing is obtained with p2=M but it can be reduced if p2 is further set to a value below M)

input_HOS-NWT.dat will have to be attached to run this program.

Setting the value of integer icase in input_HOS-NWT.dat

• icase = 1 : Sloshing case Computation starts with a natural mode of the tank (in x) of a given amplitude

• icase = 2 : Monochromatic case Regular wave is generated in the NWT User defines frequency, amplitude, phase (and angle of propagation if 3D simulation)

• icase = 3 and 31 and 32 and 33 : File case Wavemaker movement is deduced from input file named 'filename'

  • 3 - filename.cfg describes the configuration of wavemaker filename.dat describes the frequency components of wavemaker movement
  • 31 - filename.txt is an output of control software used in ECN Wave Basin
  • 32 - filename.txt is an output of control software used in ECN Towing Tank
  • 33 - filename.txt is an output of control software used in other tanks

• icase = 4 and 41 : Irregular wave Wavemaker movement creates an irregular wave field with a given Hs and Tp

  • 4 - JONSWAP spectrum
  • 41 - Bretschneider spectrum

Further details about input file, output of the code... may be find at the Wiki page of HOS-NWT project: https://github.com/LHEEA/HOS-NWT/wiki

1. Fully FFT resolution for spectral and additionnal modes. 1.1. Fully nonlinear HOS for free surface 1.2. 1st, 2nd and 3rd order wavemaker modeling
2. Runge-Kutta 4th-order scheme in time.

^ Y (the width of wave tank)
|
|
O ---------> X (the length of wave tank)

Y ^  eta(1,n2) eta(2,n2) --------------- eta(n1,n2)
  |    .         .                          .
  |    .         .                          .
  |  eta(1,3)    .                          .
  |  eta(1,2)  eta(2,2) ----------------- eta(n1,2)
  |  eta(1,1)  eta(2,1) eta(3,1) -------- eta(n1,1)
  0 -------------------------------------------> X

[L] = h
[T] = 1/sqrt(g/h)