[FLASH-USERS] Question of 3D ray tracing in 2D simulation

[Norbert Flocke]

Hi Po-Yu,

Your confusion comes from the sentence:

For cylindrical coordinate, (x,y,z) should correspond to (r,z,theta).

What you are stating here are the 3D cylindrical coordinates, which is
not what 3D ray tracing in 2D cylindrical uses. The 3D in 2D cylindrical
retains the original (r,z) 2D cylindrical coordinates (in FLASH these
would be the (x,z) axis) and uses the y-coordinate to mimic the angular
coordinate of a 3D cylindrical domain. Please have a look at the 
FLASH user's guide section: 16.4.7.2 The Approximate 3D in 2D Ray Tracing 
Solution, and especially Figure 16.9: Shape and location of the TW cells.
I hope this helps.

Best regards,
Norbert


On Mon, 24 Nov 2014, pchang wrote:

> Hi all,
> I am testing the 3D ray tracing in 2D cylindrical coordinate.
> I put one beam incident on my target on the plane of y=0.
> I also put another beam incident on my target on the plane of x=0.
> When I look at the "RayData" in the output file, it has five columns for 
> (tag,x,y,z,power). For cylindrical coordinate, (x,y,z) should correspond to 
> (r,z,theta). Therefore, for the beam on y=0 plane, theta should equal to 90 
> or 270 degree. And for the beam on x=0 plane, theta should equal to 0 or 180. 
> However, they are all "0". So does it mean the beam is always projected to 
> theta=0 in the simulation?
>
> Cheers,
>
> Po-Yu
>
> -- 
> Po-Yu Chang
> Postdoc
> Fusion Science Center,
> Laboratory for Laser Energetics
> University of Rochester
> 250 East River Road
> Rochester, New York 14623
> Phone: (585) 273-5179
> FAX: (585) 275-5960
> pchang at lle.rochester.edu
>