Changes between Version 37 and Version 38 of PhysicsDataExplained

Timestamp:

10/11/12 19:22:29 (12 years ago)

Author:

ehansen

Comment:

—

PhysicsDataExplained

@@ -101 +101 @@
 
 [[BR]]
-== Cylindrical Symmetry (2.5D) ==
-This section gives some brief details on how you can take advantage of cylindrical coordinates if your problem has such symmetry.
+== Cylindrical Coordinates with Axial Symmetry (2.5D) ==
+This section gives some brief details on how you can take advantage of cylindrical coordinates with axial symmetry if your problem has such symmetry.
 
-* '''''{{{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.
+* '''''{{{iCylindrical:}}}'''''  Controls whether astrobear is to use cylindrical coordinates with axial symmetry.  The default is 0 which leaves everything in Cartesian, 1 is for no angular momentum, and 2 is for with angular momentum.
 
-Basically 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.
+Basically when iCylindrical is not 0, astrobear changes the differential operators and how each axis is treated.  In other words, astrobear switches to a cylindrical coordinate system with axial symmetry (no phi dependence).  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 makes sense when ndim = 2.
 
-Furthermore, 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).
+Furthermore, if your problem has rotation then iCylindrical should be set to 2.  This will change the ivz component to the angular momentum component (phi).  This does not mean that there is phi dependence, only that there is motion in the phi direction.  Otherwise, if iCylindrical=1 then there is only ivx (radial) and ivy (cylindrical z).
 
 One 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.