Bicubic elements have been implmented on rblocks. Greatly improved
convergence properties were reported. Still need to have the linear
solves optimized, and also ned to be implemented on tblocks.=20
(Matrix-vector multiplies have been optimized, but new line Jacobi
preconditioning has not.) CFL definition has not yet been updated.=20
Degenerate block works, but has not been implemented for R=3D0 yet. Beta
version may be available by April.
- Parallel computations (Steve P.?)
AZTEC link works in 2.3.2. Waiting for the next version (version 3) to
- Vacuum (Scott K.)
Nonlinear vacuum implementation is being debugged. The concentration
variable is being succesfully advected. SI for 3-D resistivity has not
yet been coded.=20
- Resistive wall (Tom)
Nothing to say. Nothing added to code. Morrel's code may be a problem
if it doesn't have the n=3D0 mode.
- Neo-classical closures (Tom)
Many closures are in the code, and none sem to simultaneously give
poloidal flow damping and perturbed bootstrap current. We shouldn't be
discouraged by this. We're learning things.
- Kinetic closures/particles (Charlson)
Particles (ions) have been pushed in the fields on a real NIMROD grid.=20
No interactions have been included.
- Pre-/post-processing issues (Scott K.)
Rblocks have been extended into the vacuum. Fluxgrid is undergoing
major construction. One problem is that efit reconstructions don't
have good force balance at the end.
- Computations on tblocks (Alfonso)
Tblocks work and the application (SSPX) willshow (tomorrow) that they
- Nimplot/tecplot (Carl, Scott)
Interface between xdraw binary and tecplot file has been written. This
has been incorporated in nimplot. This is
Scott K. will be adding hdf file output.
Scott P. and Charlson would like to make a DX animation of a coherent
nonlinear simulation. Looking for input from
4 PM - 5 PLANNING
Develop goals and plans for next 6 months.
Here's the latest
GOAL RESP. PERSON DATE COMMENTS
Res. wall BC. Implemented Tom. G 06/00 (slab only) Still on
Lin. high-beta disr. Pyhsics Alfonso 04/00 linear is working;
nonlinear is running now/Ming to revisit
Linear vac. validated w/GA Scott K. 04/00 Ming to get case to SK for
Sherwood/still on track
Nonlinear vac. Implemented Scott K. 04/00 Very close; SI resistivity
needs to be implemented
Push particles in NIMROD fields Scott P. 04/00 drift orbits
calculated/now needs to be debugged
AZTEC into current ver Steve P 08/00 awaiting
OO/C++ structure Ahmet 11/99 conceptually implemented (in Ahmet's
head)/progress related to POOMA's advance/POOMA uses finite
differences; can't be reconciled with NIMROD's FE formulation/this
appears to be DEAD!
"Fully functional" high ord. eles. Carl S. 04/00 (beta version)
Version 3 by APS (11/00)??
2-fluid multi-hel. RFP Rick N. 06/00 Numerical problems/still
having problems/needs higher order elements??
(can use beta version)
Compete SSPX case Alfonso 11/00 Problems w/triangles; eq. is
finally good, now can start the case
Flow and high-S in ET J.-N. 09/00 Need beta version with high-order
elements; ready for comparison with FAR
Demo. of nonlinear high-S Dalton 11/00 (linear up to S=3D10**9;
S=3D10**5 nonlinear done; still need to push
to higher S)
Formulate diamag. Corrections Chris H./Jim C. 04/00/giving talk
5PM =F1 6PM OTHER TEAM ISSUES
- The view from Germantown (Rostom)
Theory budget looks good for next year.
1/3 of theory budget will be competed in
M3D is becoming a "team"
- Popova SOW
DS will put list together.
- The Hazeltine Report
DS will tke care of it!
- Other ??
- Date and place of next team meeting
DS will look into having the meeting in Las
Vegas in mid-August
6 PM ADJOURN
SUNDAY, MARCH 26
9:00 AM - 1 PM: RESULTS AND DISCUSSIONS
- Neoclassical Tearing Mode (Tom)
The trials and tribulations of neoclassical theory and its
implementation in NIMROD were discussed in
The "flow damping form" may be promising. we don't know if it's giving
the right answer.
2. Check with delta-P=3D0
4. Try different parameters parameters
5. NEAR benchmarks
- Spheromak modeling (Carl, Alfonso)
Regularity problem for the SSPX equilibrium appear to have been fixed.=20
Linear studies to begin. (Alfonso)
Bruce Cohen (LLNL) is giving a NIMROD related paper at Sherwood. This
the first time a non-team member has given a paper using NIMROD, and we
consider this to be a significant development.
- FRC (Alfonso)
Work in progress; no report.
- D3D High-beta disruption (Alfonso)
"Generic" shot 87009 was reported. Linear work has progressed.=20
Nonlinear calculations with self-similar heating profiles are
- High-S (Dalton)
Lower q(0) back to 0.98 and look at the n=3D1
New results were reported.
- Two-fluid RFP (Rick)
Extensive stability analysis indicates that the 2-fluid calculations
should be stable. We still don't understand this problem. Needs
higher order elements for solution?
- Diamagnetic corrections (Chris)
Chris told us how to put diamagentic (FLR??) effects into the resistive
If you put in diamagnetic effects, you also need to put in some sort of
damping (ion Landau damping?) to get rid of the radially propagating
1 PM ADJOURN