A first collision source method for ATTILA, an unstructured tetrahedral mesh discrete ordinates code

Conference · Tue Dec 01 00:00:00 EST 1998

OSTI ID:296754

Wareing, T A; Morel, J E; Parsons, D K

A semi-analytic first collision source method is developed for the transport code, ATTILA, a three-dimensional, unstructured tetrahedral mesh, discrete-ordinates code. This first collision source method is intended to mitigate ray effects due to point sources. The method is third-order accurate, which is the same order of accuracy as the linear-discontinuous spatial differencing scheme used in ATTILA. Numerical results are provided to demonstrate the accuracy and efficiency of the first collision source method.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 296754
• Report Number(s): LA-UR-98-1373; CONF-980403-; ON: DE99000616; TRN: 99:003053
• Resource Relation: Conference: Radiation protection and shielding topical meeting: technologies for the new century, Nashville, TN (United States), 19-23 Apr 1998; Other Information: PBD: [1998]
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
99 MATHEMATICS
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
MESH GENERATION
A CODES
NEUTRON TRANSPORT THEORY
DISCRETE ORDINATE METHOD
POINT SOURCES
ACCURACY
THREE-DIMENSIONAL CALCULATIONS
FINITE ELEMENT METHOD