The following is a list of specific projects to be done along with estimates
of the number of RU needed for each part. These estimates are based on
testing done on the OSC Origin 2000 and on the NCSA Origin 2000 cluster.
Specifically, this project plans to
- Forge a link with earlier, 2D axisymmetric hydrodynamic simulations, by
exploring for a small subset of earlier 2D simulations those modes of
instability that are suppressed in 2D, but which are expected on the
basis of linear stability analysis to dominate the formation of
internal jet structure in 3D; see the next section for further
comments. For these axisymmetric relativistic jets in 3D cartesian
coordinates we request a total of three such runs at 150 RU per run.
The total requested is 450 RU for this part.
- Study the <#16#>nonlinear<#16#> development of instability for a small subset
of earlier 2D simulations by perturbing the flow with a periodic
driving force designed to excite the most unstable modes suggested by
linear stability analysis. This project will study the nonlinear
development of instability in Cartesian coordinates of some of the
axisymmetric simulations. We request a total of three such runs at 150
RU per run. The total requested is 450 RU for this part.
- Study the development of internal jet structure, and its subsequent
evolution, due to the interaction of a jet with an ambient density
inhomogeneity -- an idealization of the interaction of the jet with an
interstellar cloud or gradient in the diffuse interstellar medium. The
deflection of initially axisymmetric jets in Cartesian coordinates will
begin to address the important issue of which mechanisms are most
viable for deflection, help us to understand the jet's response to
bending, the possible maintenance of the jet's integrity and the
development of its internal structure. We request a total of three
such runs at 150 RU per run. The total requested is 450 RU for this
part.
- Study the development of internal jet structure and its subsequent
evolution due to <#17#>precession<#17#> of the jet inflow -- a process
strongly suggested by the S-symmetric kiloparsec-scale sources, and
likely to occur in situations with multiple galactic nuclei. We hope to
extract information on the kinematics of high brightness structures in
the complex evolving flow. Due to the complexity of the flow induced
by the precession this will be a single high resolution run of the
code. We estimate that 500 RU will be needed for this.
The total requested RU for the project is thus: 1850 RU.