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1. btj
   

   Member
   Joined: Mar '20
   Posts: 3

   In example_na_modelling_nonlinearity,what is 'wavelength_separation=15' physical unit

   Posted 4 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   It is the number of wavelengths between the source and sensor. To convert to metres, multiply by the size of the wavelength.

   Brad.

   Posted 4 years ago #

3. btj
   

   Member
   Joined: Mar '20
   Posts: 3

   In same demo “example_na_modelling_nonlinearity”，After a short time the data disappeared when i set the speed of sound to 150,What caused this?

   Posted 4 years ago #

4. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   This combination of sound speed and shock parameter etc gives a negative value for B/A, so I guess the simulation becomes unstable. Try setting:

   p0 = 50e3;                     % source pressure [Pa]
   c0 = 150;                      % sound speed [m/s]
   rho0 = 1000;                   % density [kg/m^3]
   alpha_0 = 2;                   % absorption coefficient [dB/(MHz^2 cm)]

   Brad

   Posted 4 years ago #

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