Skip to content
  • Search
Skins
  • Light
  • Cerulean
  • Cosmo
  • Flatly
  • Journal
  • Litera
  • Lumen
  • Lux
  • Materia
  • Minty
  • Morph
  • Pulse
  • Sandstone
  • Simplex
  • Sketchy
  • Spacelab
  • United
  • Yeti
  • Zephyr
  • Dark
  • Cyborg
  • Darkly
  • Quartz
  • Slate
  • Solar
  • Superhero
  • Vapor

  • Default (No Skin)
  • No Skin
Collapse

ZMT zurich med tech

  1. Home
  2. Sim4Life
  3. Analysis & Postprocessing
  4. Calculate Divergence of B field

Calculate Divergence of B field

Scheduled Pinned Locked Moved Analysis & Postprocessing
1 Posts 1 Posters 305 Views 1 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • T Offline
    T Offline
    tiwwexx
    wrote on last edited by
    #1

    Hello! I'm trying to compute the divergence of the B field in a simulation to double check that it is 0.
    To do this I export out an overall field sensor B(x,y,z,f0) to matlab, read it in, use the cell centers convention
    (axis_n(1)+axis_n(2))/2
    to reshape the data into an ndgrid

    x_pos= (a.Axis0(1:end-1)+a.Axis0(2:end))/2;
    y_pos= (a.Axis1(1:end-1)+a.Axis1(2:end))/2;
    z_pos= (a.Axis2(1:end-1)+a.Axis2(2:end))/2;
    [x,y,z] = ndgrid(x_pos,y_pos,z_pos);
    

    and a 4D array (x,y,z,3) where the 4th dimension is the Bx,By,Bz components.

    B_field =  reshape(a.Snapshot0,numel(x_pos),numel(y_pos),numel(z_pos),[]);
    

    I then get the divergence of my b field as

    div_b = divergence(y,x,z,B_field(:,:,:,1),B_field(:,:,:,2),B_field(:,:,:,3))
    

    When looking at this field (shown below) it is clearly not 0 everywhere which somewhat confused me. I verified that my B_flux through different square and spherical surfaces was equal to 0 in the analysis tab which I thought should directly translate to div_b ~ 0 everywhere.

    Any suggestions on why this didn't work would be much appreciated!
    b0fb234b-8d80-4980-937e-3967b6e82d6c-image.png
    0ec7867c-8831-4e92-882b-15d004d1b125-image.png

    1 Reply Last reply
    0
    Reply
    • Reply as topic
    Log in to reply
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes


    • Login

    • Don't have an account? Register

    • Login or register to search.
    • First post
      Last post
    0
    • Search