http://www.k-wave.org/forum/topic/setting-up-pressure-gradient Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 06:49:52 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/setting-up-pressure-gradient#post-4892 Fri, 12 Dec 2014 12:15:22 +0000 Bradley Treeby 4892@http://www.k-wave.org/forum/ <p>Hi Yi,</p> <p>Using the function <code>kspaceSecondOrder</code> it is possible to directly set the initial pressure gradient using <code>source.dp0dt</code>. This is illustrated in the <a href="http://www.k-wave.org/documentation/example_ivp_setting_initial_gradient.php">Setting An Initial Pressure Gradient Example</a> (you can access this via the MATLAB help browser). </p> <p>If you want to enforce a particular gradient during the simulation, then I would suggest using <code>kspaceFirstOrder3D</code> (etc), and using a pressure or velocity source with <code>source.p_mode</code> or <code>source.u_mode</code> set to <code>dirichlet</code>. Again, there are examples of how to use pressure and velocity sources in the toolbox.</p> <p>Hope that helps,</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/setting-up-pressure-gradient#post-4879 Mon, 08 Dec 2014 20:33:08 +0000 gerneral0 4879@http://www.k-wave.org/forum/ <p>Hi,</p> <p>I am new to K-Wave tool box here. I was wondering how should I set up the initial pressure gradient. If possible, how would I keep the gradient though the simulation. In the matlab help document, I realized it is possible to do it. But without sample codes, I got confused.<br /> Thanks,<br /> Yi </p>