Changes between Version 33 and Version 34 of PhysicsDataExplained


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Timestamp:
10/10/12 16:53:38 (12 years ago)
Author:
ehansen
Comment:

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  • PhysicsDataExplained

    v33 v34  
    9999
    100100 * '''''{{{lMPI_ID:}}}'''''  Stores the MPI ID of a grid.  It may seem redundant (since a grid can have only one MPI ID), but outputting it as a variable allows us to use visualization tools to see how AstroBEAR is distributing the grids.
     101
     102=== Cylindrical Symmetry (2.5D) ===
     103This section gives some brief details on how you can take advantage of cylindrical coordinates if your problem has such symmetry.
     104
     105* '''''{{{iCylindrical}}}'''''  Controls whether astrobear is to use cylindrical coordinates.  The default is 0 which leaves everything in Cartesian, 1 is for no angular momentum, and 2 is for with angular momentum.
     106
     107Basically when iCylindrical is not 0, astrobear changes the differential operators and how each axis is treated.  In other words, astrobear switches to cylindrical coordinates.  The x-axis becomes the radial axis, the y-axis becomes the cylindrical z-axis, and the z-axis is nothing since this is only implemented for ndim = 2.
     108
     109Furthermore, if your problem has rotation then iCylindrical should be set to 2.  This will change the ivz component to the angular momentum component.  Otherwise, if iCylindrical=1 then there is only ivx (radial) and ivy (cylindrical z).
     110
     111One other important thing to note...if iCylindrical is not 0, then mydim (a global parameter in physics declarations) will be set to 3, otherwise it is set to ndim.