Full Index for Scripted foilset 
| We describe basic physics and computational features of Binary Black Collision Grand Challenge |
We show a simple finite difference is complicated by
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| MPI or more generally message passing is not obsolete but rather the only complete solution! |
| Higher level systems DAGH and especially HPF cannot express full complexity of problem and MPI must fill in the missing parts |
| HPF2 might be able to express full problem but HPF1 misses many key capabilities |
| DAGH is more succesful than HPF1 but needs MPI for parts of problem |
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Postscript or FramemakerVersion |
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HPF Code for Linear Waves |
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Grand Challenge Alliance Home Page |
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NPAC Activity in Grand Challenge Alliance |
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HPF & DAGH usage in the Binary Black Hole Grand Challenge
Goals of the Alliance 
Black Hole Grand Challenge Alliance
Black Hole Initial Condition from Scott Klasky
Computational Infrastructure
ADM Equations
ADM Equations continued
Causal Differencing
Causal Differencing continued
Apparent Horizon boundary conditions
Difficulties of the BBH Problem
DAGH System
Sample HPF and
Sample of HPF and DAGH code
Parallel Execution in DAGH
Parallel Execution in DAGH continued
Implementation
Linear Waves
Linear wave problem with outer boundary condition
Elliptic Problem for the shift
Black holes (Inner boundary condition)
Black holes continued
Moving Inner boundary continued
Moving Inner boundary
Finding the Apparent Horizon
Some Conclusions on Programming Models Full WebWisdom URL and this Foilset Search
This contains all WebWisdom links preceded by those referenced in this foilset