[FLASH-USERS] 2D disk models

[Giovanny Bernal]

Hi,
I have a similar problem... how I put rotation (v_phi <>0) in  
cylindrical and polar geometries in flash2.5?? In init_block? in  
hydro_sweep?
thanks

El 08/01/2008, a las 04:47 AM, Peter Woitke escribió:

> Hi,
>
> I have a very basic question. I would like to setup a FLASH model
> in cylinder coordinates (r,z,phi) assuming 2D axisymmetry (d./dphi=0)
> with rotation v_phi<>0.
>
> My problem (or maybe just a misunderstanding) is that if I specify 2D
> geometry = "cylindrical", there seems to be no rotation in the model
> (v_phi=0?) and I cannot find/specity the v_phi variable. If you  
> write down
> the hydro-equations in cylinder coordinates, the problem becomes very
> apparent: The equation of motion (r-direction) contains the  
> centrifugal
> term -(rho v_phi^2)/r. In order to keep track of v_phi, however,  
> one needs
> to solve the equation of motion (phi-direction), too, i.e. the angular
> momentum conservation.
>
> So what I want is a solution of the full 3D hydro-equtions in cylinder
> coordinates just under the condition of axisymmetry d./dphi=0.
>
> How do I do this with FLASH?
>
> Thank you,
>
>    Peter Woitke
>