A Diffusion Synthetic Acceleration Method for Block Adaptive Mesh Refinement.
- Robert C.
- Randall S.
- Jim E.
A prototype two-dimensional Diffusion Synthetic Acceleration (DSA) method on a Block-based Adaptive Mesh Refinement (BAMR) transport mesh has been developed. The Block-Adaptive Mesh Refinement Diffusion Synthetic Acceleration (BAMR-DSA) method was tested in the PARallel TIme-Dependent SN (PARTISN) deterministic transport code. The BAMR-DSA equations are derived by differencing the DSA equation using a vertex-centered diffusion discretization that is diamond-like and may be characterized as 'partially' consistent. The derivation of a diffusion discretization that is fully consistent with diamond transport differencing on BAMR mesh does not appear to be possible. However, despite being partially consistent, the BAMR-DSA method is effective for many applications. The BAMR-DSA solver was implemented and tested in two dimensions for rectangular (XY) and cylindrical (RZ) geometries. Testing results confirm that a partially consistent BAMR-DSA method will introduce instabilities for extreme cases, e.g., scattering ratios approaching 1.0 with optically thick cells, but for most realistic problems the BAMR-DSA method provides effective acceleration. The initial use of a full matrix to store and LU-Decomposition to solve the BAMR-DSA equations has been extended to include Compressed Sparse Row (CSR) storage and a Conjugate Gradient (CG) solver. The CSR and CG methods provide significantly more efficient and faster storage and solution methods.
- Research Organization:
- Los Alamos National Laboratory
- Sponsoring Organization:
- DOE
- OSTI ID:
- 977990
- Report Number(s):
- LA-UR-05-4684
- Country of Publication:
- United States
- Language:
- English
Similar Records
DANTSYS: A diffusion accelerated neutral particle transport code system
Fully consistent, linear discontinuous diffusion synthetic acceleration on 3D unstructured meshes
Coarse-mesh diffusion synthetic acceleration in slab geometry
Technical Report
·
Wed May 31 20:00:00 EDT 1995
·
OSTI ID:212580
Fully consistent, linear discontinuous diffusion synthetic acceleration on 3D unstructured meshes
Conference
·
Sun Dec 31 23:00:00 EST 2000
·
OSTI ID:975271
Coarse-mesh diffusion synthetic acceleration in slab geometry
Journal Article
·
Sat Jul 01 00:00:00 EDT 2000
· Transactions of the American Nuclear Society
·
OSTI ID:20104470