http://www.k-wave.org/forum/topic/problem-with-making-kgrid Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 01:13:39 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/problem-with-making-kgrid#post-4976 Wed, 04 Feb 2015 23:54:42 +0000 Bradley Treeby 4976@http://www.k-wave.org/forum/ <p>Hi Zia,</p> <p>It's easy enough to check why this isn't feasible using k-Wave if you check the numbers:</p> <pre><code>% simulation parameters f = 50e3; % [Hz] c = 1500; % [m/s] d = 3e3; % [m] % compute dx and Nx ppw = 2; dx = c/(ppw*f); Nx = round(d/dx); % compute memory used for each matrix mem = Nx^2 * 8 / 1024^3;</code></pre> <p>The memory required to store one 2D matrix of this size in double-precision is 300 GB!</p> <p>Depending on your source and boundary conditions, you could look at using the boundary element method, or solving the Rayleigh integral.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/problem-with-making-kgrid#post-4964 Wed, 28 Jan 2015 17:59:01 +0000 zia.roghani 4964@http://www.k-wave.org/forum/ <p>Hi Bradely Treeby.<br /> I need to simulate a sound source 3Km away from an array of 3-sensors 10m apart from each other. the medium is sea-water.The grid spacing used can be dx=dy. i have the latest core i7 machine for simulation. could you please suggest how i can do it. </p> http://www.k-wave.org/forum/topic/problem-with-making-kgrid#post-4842 Thu, 20 Nov 2014 11:01:15 +0000 Bradley Treeby 4842@http://www.k-wave.org/forum/ <p>Hi Zia,</p> <p>The problem is that your grid size is extremely large (each matrix is 343 GB), so you are likely seeing out of memory errors. Simulating 50 kHz waves in water over 3 km is a very large domain, even in 2D.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/problem-with-making-kgrid#post-4841 Wed, 19 Nov 2014 17:33:36 +0000 zia.roghani 4841@http://www.k-wave.org/forum/ <p>Hello everybody,<br /> whats is wrong with the code.it return the errors<br /> "Error in makeGrid (line 83)<br /> kgrid = makeGridStruct(varargin{:});</p> <p>"Error in k_GRid (line 11)<br /> kgrid=makeGrid(Nx, dx, Ny, dy);"</p> <p>clear all;<br /> clc;<br /> x_size=3000;<br /> y_size=3000;<br /> f_max= 50000;<br /> c0_min=1400;<br /> dx=c0_min/(2*f_max);<br /> dy=dx;<br /> Nx=round(x_size/dx);<br /> Ny=round(y_size/dy);<br /> kgrid=makeGrid(Nx, dx, Ny, dy); </p>